314 NAVAL RESEARCH LAB WASHINST ON DCFG 2 …

AD-AlSO 314 NAVAL RESEARCH LAB WASHINST ON DCFG 2COMBUSTION SCALING AND MOD ELINB CFIRE SUPPRESSION BY NITROGEN P-!ETClUlJUL 78 J P STONE. J I ALEXANDER. F W WILLIAMS

"NCLASSIFIED NRL-R-3792

Combustion Scaling and Modeling: Fire Suppressionby Nitrogen Pressurization

V - Test Data, NRL 5V-liter Facility,Test Configurations 4, 5, and 6. +

/ -9 ." JACK P./STONE JOHN I.jLEXANDER ANDFREDERICK W. WILLIAMS

7Combustion and Fuels BranchChemistry Division

{1~'JU4178 /r7 or-

-ai ° " ,-> ...

NAVAL RESEARCH LABORATORYWashington, D.C.

Approved for public release; distribution unlimited. 00(D"- j

SECURITY CLASSIFICATION OF THIS PAGE (When Does Entered)

REPOR DCMENTTIONPAGEREAD INSTRUCTIONSREPORT DOCUMENTATION PAGE BEFORE COMPLETING FORMI. REPORT NUMBER 2. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER

NRL Memorandum Report 3792 I

4. TITLE (and Subtitle) S. TYPE OF REPORT & PERIOD COVERED

COMBUSTION SCALING AND MODELING: FIRE SUP-PRESSION BY NITROGEN PRESSURIZATION V - TESTDATA, NRL 5000-LITER FACILITY, TEST CONFIGURA- 6. PERFORMING ORG. REPORT NUMBERTIONS 4, 5, AND 6

7. AUTHOR(s) S. CONTRACT OR GRANT NUMBER(*)

Jack P. Stone, John 1. Alexander, and F. W. Williams

9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT. PROJECT, TASK

AREA & WORK UNIT NUMBERS

Naval Research Laboratory 61153N-24Washington, D. C. 20375 RR024-02

NRI. Prnhiem ('05-39II. CONTROLLING OFFICE NAME AND ADDRESS 12. REPORT DATE

Naval Research Laboratory July 1978Washington, D. C. 20375 13. NUMBER OF PAGES

18I4 MONITORING AGENCY NAME B ADDRESS(II dilferent lom Controllng Office) IS. SECURITY CLASS. (of tile report)

UNCLASSIFIEDI5a. DECL ASSI FIC ATION/DOWNGRADING

SCHEDULE

IS. DISTRIBUTION STATEMENT (of thie Report)

Approxed for public release; distribution unlimited.

17. DISTRIBUTION STATEMENT (of the abstract entered In Block 20, If different fro, Reporl)

IS. SUPPLEMENTARY NOTES

19. KEY WORDS (Continue on reverse aide If neceesary and Identify by block nuber)

Fire suppressionEnclosed spacesScale modeling

204 BSTRACT (Continue on reveree side If necesery and Identify by block nuember)

Gas mixing rate studies in a 5000-liter cylindrical tank continue. Observations of gas tempera-tures are made with thermocouple probes during pressurization from I to 2 atmospheres throughone-, two-, and three-nozzle arrays with diameters of 15.2 nm in ca. 30, 16, and I I s, respectively.Pressurant concentrations may be inferred from temperature measurements. Nine experimental runsare reported in which air is used as both the pressurant andthe resident gas under nonfire conditionswith no flow obstacles. ,

'FORM T

DD J .IAN7S 1473 EDITION OF I NOV 65 IS OBSOLETES/N 0102-014- 6601

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SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered)

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CONTENTS

INTRODUCTION ... . . . . . . . . . . . . . . . . . . . .I

DESCRIPTION OF EXPERIMENT.................................. 3

Procedure ................................................. 3Tank I...................................................4Tank 2...................................................4Thermocouples..............................................5Nozzles ................................................... 5Data Collection.............................................6

PROGRAM PLANS ............................................. 6

TEST CONFIGURATIONS........................................7

Configurations .............................................. 7Procedure................................................... 7

REPORT SUMMARY ........................................... 8

ACKNOWLEDGMENTS..........................................8

REFERENCES................................................8

-k-

\v , ,

COMBUSTION SCALING AND MODELING: FIRE SUPPRESSIONBY NITROGEN PRESSURIZATION

V - Test Data, NRL 5000-liter Facility,

Test Configurations 4, 5, and 6

INTRODUCTION

There is concern over potential destructiveness of unwanted submarine fires, but existing

fire suppression techniques for submarires are limited. Addressing this problem, Carhart and

Fielding (1) proposed nitrogen pressurization as a fire suppression technique for submarines.

Their concept derives from three basic premises: (a) A submarine is a gas-tight vessel,

whose internal pressure can be varied over a limited range; (b) sustenance of human life re-

quires an oxygen partial pressure of about 0.2 atmosphere regardless of total pressure, at least

to several atmospheres; (c) combustion of fuels depend on atmospheric oxygen concentration;

for instance, hydrocarbon diffusion flames extinguish at oxygen concentrations of 12 to 14 per-

cent by volume. This is the basis of a patent by Carhart et al. (2).

For example, if a closed space with one atmosphere air pressure is pressurized to two at-

mospheres by addition of nitrogen gas, the oxygen partial pressure in the space remains a con-

stant 0.21 atmosphere, while the oxygen concentration by volume reduces by 1/2 to 10.5 per-

cent. This example demonstrates the nitrogen-pressurization concept, i.e., creation of an at-

mosphere that sustains human life but suppresses combustion. Other advantages include inert-

ness of nitrogen to electrical wiring, machines, and air-purification devices as well as the rela-

tive ease of returning a submarine atmosphere to normal after nitrogen has been added.

Manuscript submitted June 9. 1978.

I

- - - .. . . . ' ~~. L. -,,, ______,..__._.,__"

STONE, ALEXANDER, AND WILLIAMS

Initial tests support the nitrogen pressurization concept. Liquid hydrocarbon fuel pool

fire suppression studies in 270- and 5000-liter chambers have demonstrated suppression capa-

bility for fires up to 20 cm in diameter (3-5). A study of biological effects on laboratory rats

during pool-fire suppression experiments in the 5000-liter facility demonstrated that rats could

survive during the suppression of pool fires by nitrogen pressurization (6).

Although initial experimental findings support the concept, many questions and problems

remain. One of these problems involves rates of mixing of the pressurant gas with the resident

gas during pressurization, and how various parameters such as geometry, nozzle design and lo-

cation, and pressurization time affect these rates. Scale modeling is applied due to the complex-

ities of processes that couple in fire suppression and the savings of time, money, and material

that successful modeling affords.

Our present aim is to investigate nitrogen concentration profiles in chambers of different

sizes, to link these experimental results to mathematical models, and to seek scaling rules

which predict concentration profiles in larger chambers.

Two sets of experiments are in progress: the NRL 5000-liter experiment described here

and a 1/6-scale (geometric) model of the NRL experiment performed at the University of

Washington by Professor R.C. Corlett's group (NRL Contract N00014-75-C-0185). In addi-

tion, these experimental results are to be linked with two mathematical modeling studies by

Professor Pratt's group at the University of Utah (NRL Contract N00173-76-C-0232) and by

the Laboratory for Computational Physics, NRL Code 6020. Because of its convenient size,

concentration profiles in the 1/6-scale model are measured directly. This approach is less prac-

tical in the NRL facility, however, because of its larger size. Remoteness of chemical sensors

from gas collection probes in the chamber can allow diffusion of sampled gas in the long sam-

pling tubes (about 8 m) which connect to slow responding chemical detectors.

2

NRL MEMORANDUM REPORT 3792

To avoid this problem, temporally responsive, in situ probes with electrical output signals

are preferred. Since mechanisms of mass and momentum transfer are the same in separated

flow, velocity and concentration profiles are similar (7). In addition, for gases which have a ra-

tio of thermal and molecular diffusivity near unity, temperature and velocity profiles approxi-

mately coincide in time and space (8,9).

In these initial mixing experiments, fine wire thermocouples are used to measure gas

temperatures and infer pressurant concentrations and thus mixing rates. Jones, Boris, and

Oran examined this approach with a view to first principles. They concluded that temperature

as a diagnostic appeared feasible so long as initial temperatures of the pressurant gas are equal

or less than those of the resident gas of the 5000-liter chamber (10).

This is the fifth reporting of a series (11-14).

DESCRIPTION OF EXPERIMENT

Procedure

Figure 1 schematically shows the experimental arrangements. Dry, compressed air blows

from Tank 1 to Tank 2 through a galvanized, 3-in. pipe and a manifold which distributes the

flow to three nozzle positions. Either a one-, two-, or three-nozzle configuration may be select-

ed simply by insertion of pipe plugs into the unwanted nozzle positions. Jets of the incoming

air blow from selected nozzles down vertical radii normal to the tank horizontal axis and mix

with Tank 2 resident air. Temperature differences between incoming and resident air act as

the diagnostic indicating mixing patterns. Thermocouples arrayed in the tank signal air tem-

peratures and thus imply concentration profiles of incoming air (pressurant). The actuated ball

valve, 3" AF Flanged Ball Valve by Jamesbury Corporation, allows either "no-flow" or

"full-flow" conditions according to its "off" or "on" position, respectively.

Tank I is charged with clean, dry plant air through the air valve by Automatic Switch

3

STONE, ALEXANDER. AND WILLIAMS

Company (Figure 1) and passes through the 3-in. pipe section to Tank 1 with the actuated ball

valve closed. Compressed plant air is processed, at a controlled rate, through a Heatless Dryer,

Model G.C., by Deltech Engineering.

Tank 1

Tank 1, a steel cylindrical pressure tank with two dished ends, lays horizontally. Its

volume is 2260 liters (79.9 cu ft) with a length of 2.334 m (7.66 ft), a diameter of 1.067 m (3.44

ft), and a wall thickness of 9.5 mm (3/8 in.). A pressure transducer, Model P24 by Validyne

Engineering Corporation, connected to Tank 1 by a 6.4-mm (1/4-in.) tube indicates its pres-

sure. Gas temperature in the tank is indicated by a bare thermocouple, type K, with a diame-

ter of 0.2 mm (0.008 in.). The thermocouple extends radially into the tank near its exit. A

similar thermocouple is installed at a 90-degree ell and extends into the 3-in. pipe just down-

stream from the Tank I exit.

Tank 2

Tank 2 is a modified decompression chamber. Cylindrical in shape and made of steel, its

volume is 5000 liters (177 cu ft) with a length of 2.74 m (9 ft), a diameter of 1.546 m (5.07 ft),

and a wall thickness of 11.1 mm (7/16 in.). A hatch on one end opens inwardly, allowing ac-

cess to the interior. An air lock is centered on the opposite end. Three 5-in. view ports are lo-

cated, two on a side and one on the hatch. The chamber was modified to allow numerous

tubes, wires, thermocouples, and pipes to penetrate its walls. Original interior nozzle system,

lighting system, and 6.4-mm (1/4-in.) steel floor plates remain; all other hardware associated

with a manned chamber has been removed. In addition, two 12.7-mm (1/2-in.) aluminum

plates were laid on the floor plates, as Figure 2 shows. The aluminum plates contain a square,

76.2-mm (3-in.) grid of tapped holes. These holes receive threaded, 12.7-mm aluminum rods

which position thermocouples in the chamber interior space according to their length and grid

position. 4


For convenience, a cylindrical coordinate system (r, 0, z) is chosen to indicate chamber

interior positions. As Figure 2 shows, a vertical plane through the center of the cylindrical

tank normal to its center axis is taken as the z -0 plane, with the air lock selected as the posi-

tive z direction and the hatch as the negative z direction. The center, horizontal axis of the

tank is taken as r -0.

Tank 2 pressure is indicated by a transducer, Validyne Engineering Corporation, which

connects to the chamber by a 3.2-mm (1/8-in.) tube.

Thermocouples

Chromel alumel (Type K) bare-wire thermocouples are mounted, as shown in Figure 3,

on 12.7-mm diameter rods. Couple wire diameters are 0.2 mm with couple bead diameters

from 2 to 2.5 times the wire diameters. The manufacturer (Conax Corporation) gives the accu-

racy as ±1.IK with time constants of ca. 0.3 s at flows of 19 m/s and 1.2 s at 3 m/s. Thermo-

couple chamber coordinates are g-ven in Table 1.

Nozzles

Three pipe couplings are welded into the top of Tank 2 so that the Z = 0 plane bisects

the center nozzle position. Likewise, the other two positions are bisected by the Z = 0.914 m

(36 in.) plane and the Z = -0.914 m ( -36 in.) plane.

Straight nozzles machined from high-density polyethylene rod, shown in Figure 4, are

threaded to mate the couplings. Fits are such that nozzle exits extend 0.305 m (1 ft) into the

tank interior, pointing downward along vertical radii. As Figure 1 shows, a bare-wire, 0.2-mm

diameter thermocouple is positioned in the pipe immediately upstream of the center nozzle. A

5

i


similar thermocouple is positioned at the center of the nozzle exit, tank position (0.475 m, r/2,

0).

Data Collection

The data collection sstem consists of two Doric Digitrend-220's, each with a magnetic

tape device that can be started simultaneously by a remote control. In these experiments, 20

transducer outputs are read, 10 by one Doric system on channels 60 through 69 and 10 by the

other system on channels 70 through 79. Each system records two additional channels: (a) the

time indicated by an internal clock in hours: minutes: seconds, and (b) an eight-digit fixed data

point in which the date and run number are entered. Thus 24 channels are scanned at a rate of

40 channels per second by the two systems to produce two magnetic tapes of data. A single

scan requires ca. 0.6 s.

The two magnetic tapes are then processed with a Hewlett Packard 21MX minicomputer,

for which programs are written to present the data in tabular form as shown in Figure 5.

The data from each Doric System are also compiled in tabular form onto a single magnetic

tape. This tape contains time, and 10 channels of data (Channels 60 through 69), repetitively

until reaching the end of run (end of file), followed by another file containing the same infor-

mation for the second 10 channels of data (Channels 70 through 79). The format is 118 ASCII

characters and end of. record.

PROGRAM PLANS

Initial experiments include two sets of six test configurations as shown below. In one set,

a nozzle diameter of 25.4 mm is used; in the other, 15.2 mm is used. Data presented in this

report are for the underlined test configurations and nozzle diameters.

6


Test Configuration I 2 3 4 5 6

Nozzle Array 1 2 3 1 2 3

Thermocouple Array I II I II

Number of Expl. Runs 3 3 3 3 3 3

Nozzle Diameter, mm 25.4 15.2

Nozzle array 1 includes only the center nozzle, nozzle array 2 includes the center and hatch-

end nozzles; nozzle array 3 includes all three nozzles. Thermocouple array I locates the ther-

mocouples along the center, horizontal axis of the chamber (Tank 2), whereas thermocouple

array 11 locates the thermocouples along a horizontal line para ,- to the center axis, but dis-

placed 0.457 m along the 45-degree radius normal to the tank axis, as viewed from the hatch

end of the chamber, Figure 2. The test procedure in this phase remains the same, and no obs-

tacles to flow are placed in the chamber.

TEST CONFIGURATIONS

Configurations

Data presented in this report were obtained with test configurations 6, 5, and 4 and a noz-

zle diameter of 25.4 mm. See microfiche inside the back cover of this report.

Procedure

Tank 1 is charged with clean dry air to a pressure of about 6.8 atm; the air temperature is

allowed to equilibrate with the tank walls. Then with Tank I pressure at about 6.5 atm (am-

bient temperature) and Tank 2 pressure at 1 atm (ambient temperature) the actuated valve is

opened. When Tank 2 pressure reaches 2 atm, the valve is closed.

Table 2 gives a chronological description of experimental runs 48 through 56.

7

... .: .-

STONE. ALEXANDER, AND WILLIAMS

REPORT SUMMARY

Data from nine experimental runs are presented as obtained with the NRL 5000-liter

chamber. The purpose is to obtain temperature information of the chamber contents from

which pressurant concentrations and thus mixing rates may be inferred. Test Configurations 4,

5, and 6 were used with a nozzle diameter of 15.2 mm.

Channel outputs and transducer locations are shown in Table 2. Millivolt outputs of both

channel 60 and 61 are high by a factor of ten; multiply each output by 0.1 to give values within

the range of 0 to 100 mV. Channel 63 is used to mark the time interval during which the

actuated valve control calls for an open valve - the valve opens and closes in ca. 2 s. With the

valve closed, channel 63 output is ca. 0 mV.

ACKNOWLEDGMENTS

The authors express their thanks to Doren Indritz and Omar Ahmed for programming and

assistance with the minicomputer, and to Professor R.C. Corlett for his discussions and sugges-

tions.

REFERENCES

1. H.W. Carhart and G.H. Fielding, "Application of Gaseous Fire Extinguishants in Subma-

rines," paper presented on Halogenated Fire Extinguishing Agents, National Academy of

Sciences, National Research Council (1972)

2. H.W. Carhart, G.H. Fielding, and R.G. Gann, U.S. Patent 3,893,514 (1975)

3. P.A. Tatem, R.G. Gann, and H.W. Carhart, "Pressurization with Nitrogen as an

Extinguishant for Fires in Confined Spaces," Combustion Sci. and Tech. 7:213 (1973)

4. Ibid. 9:255 (1974)

8


5. R.G. Gann, J.P. Stone, P.A. Tatem, F.W. Williams, and H.W. Carhart, "Suppression of

Fires in Confined Spaces by Nitrogen Pressurization: Ill Extinction Limits for Liquid Pool

Fires," submitted for publication in Combustion Sci. and Tech.

6. D.P. Dressier, R.S. Robinson, R.G. Gann, J.P. Stone, F.W. Williams, and H.W. Carhart,

"Biological Effect of Fire Suppression by Nitrogen Pressurization in Enclosed Environ-

ments," J. of Combustion Toxicology 4:325 (1977)

7. J.M. Beer and N.A. Chigier, "Combustion Aerodynamics," (Applied Science Publishers,

Ltd., London, 1972), p. 11

8. R.C. Corlett, "Concentration and Temperature Similarity," in P.L. Blacksheear (Ed.), "Heat

Transfer in Fires," (Scripta Book Co., Washington, D.C., 1974), pp. 153-162

9. F. Krieth, "Principles of Heat Transfer," 3rd Ed. (Intext Educational Publishers, N.Y.,

1973), pp. 352-358

10. W.W. Jones, J.P. Boris, and E.S. Oran, "Calculation of Gas Temperatures in N2 Pressuriza-

tion Experiments," NRL Memo. Report 3542, June 1977

11. J.P. Stone, P.A. Tatem, and F.W. Williams, NRL Memo. Rept. 3633, 28 Feb. 1978

12. J.P. Stone, J. I. Alexander, and F.W. Williams, NRL Memo. Rept. 3740, Mar. 1978

13. J.P. Stone, J. I. Alexander, and F.W. Williams, NRL Memo. Rept. 3776, May 1978

14. J.P. Stone, J.I. Alexander, and F.W. Williams, NRL Memo. Rept. 3791, June 1978

9

4


Table 1 - Transducer Channel Readouts, Locations, and Descriptions

Channel Location ReadoutNumber

60 Tank 1 Pressure: 1 mV = 10.3 kPa

61 Tank 2 Pressure:1 mV = 3.44 kPa

62 T2 (0.457, v/4, 0.533)* Temperature, 'C

63 Event Marker mV

64 T 2 (0.457, ,r/4, 0.991) Temperature, 0C

65 T 2 (0.457, r/4, 0.941) Temperature, 'C

66 T 2 (0.457, ir/4, 0.584) Temperature, 0C

67 T2 (0.457, r/4, 0.762) Temperature, 0C

68 T 2 (0.457, 1r/4, 0.686) Temperature, 0C

69 T 2 (0.457, 7r/4, 0.610) Temperature, 0C

70 N-2 (0.457, r/2, 0) Temperature, 0C

71 T 2 (0.457, r/4, 0) Temperature, 0C

72 Upstream of N-2 Temperature, °C

73 Downsteam Tank 1 exit Temperature, 0C

74 T 2 (0.457, 7r/4, 0.076) Temperature, 0C

75 T 2 (0.457, r/4, -0.076) Temperature, 0C

76 T 2 (0.457, ir/4, 0.152) Temperature, 0C

77 T 2 (0.457, 1T/4, -0.152) Temperature, 0C

78 T 2 (0.457, v/4, 0.229) Temperature, 0C

79 Tank 1 Temperature, 0C

*T2 (0, 0, 0.533) = temperature in Tank 2 (r, e, z), where r 0 m, 0 = 0 radian,

z = 0.533 m. See Figure 2.

10


Table 2 - Chronological Descriptionof Runs 48 Through 56

Time DescriptionRun 48 For channels 60 through 69

09:44:00 Start data collection 30 s prior to blowdown09:44:30 Open actuated valve to start blowdown09:45:00 Actuated valve closed when Tank 2 pressure reaches 203 kPa09:47:59 End

Run 48 For channels 70 through 79, same as channels 60 through 69

Run 49 For channels 60 through 6910:08:00 Start data collection 30 s prior to blowdown10:08:30 Open actuated valve to start blowdown10:09:00 Actuated valve closed when Tank 2 pressure reaches 203 kPa10:11:59 End








Run 53 For channels 60 through 6913:46:00 Start data collection 30 s prior to blowdown13:46:30 Open actuated value to start blowdown13:46:45 Actuated valve closed when Tank 2 pressure reaches 203 kPa13:49:59 End


11


Table 2 (Continued) - Chronological Descriptionof Runs 48 Through 56

Time DescriptionRun 54 For channels 60 through 69

14:06:00 Start data collection 30 s prior to blowdown14:06:30 Open actuated valve to start blowdown14:06:41 Actuated valve closed when Tank 2 pressure reaches 203 kPa14:09:59 End






12


3-INCH GALVANIZED PIPE ACTUATED VALVE

S0.457m 0.457m

T iPRESSURE0.1m .1 TAP

NH-2 TC

EXHAUST TO

PRESSURE TAP ATMOSPHERE

TC * TYPE K THERMOCOUPLE

Fig. I - Schematic of apparatus

- B

A AALUMINUM PLATES WITH

B / O.076m(3in.) X O.076m(3in.)MATRIX OF 330 TAPPED HOLES

z.o SECTION B-B

END VIEWSECTION A-A

PLAN VIEW

Fig. 2 - Plan and end views of Tank 2 showing cylindricalcoordinates and matrix of 330 tapped holes

13

. 6256 m -..


0.0191M

0.4699m

TO GLAND IN 0.0127fn OIA. RODTANK WALL

Fig. 3 - Thermocouple fixture

C-

.089

Fig. 4 - Sectional view of straight nozzle

14


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