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. NASA TECHNICAL MEMORANDUM NASA TM X-62,154 C :E 2 z (NASA-TM-X-621- 5 4 ) LARGE-SCALE WIND-TUNNEL N72-24011 INVESTIGATION OF THE NOISE CHARACTERISTICS OF A SEMISPAN WING EQUIPPED WITH AN EXTERNALLY BLOWN JET FLAP M.D. Falarski Unclas (NASA) May 1972 118_p- .CSCL 01B G3/02 28204 LARGE-SCALE WIND-TUNNEL INVESTIGATION OF THE NOISE CHARACTERISTICS OF A SEMISPAN WING EQUIPPED WITH AN EXTERNALLY BLOWN JET FLAP Michael D. Falarski Ames Research Center and U. S. Army Air Mobility R&D Laboratory Moffett Field, Calif. 94035 Reproduced by NATIONAL TECHNICAL INFORMATION SERVICE U S Deportm,'t If Commerte Springld VA 2215 May 1972 p - | ) A)
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Page 1: . NASA TECHNICAL MEMORANDUM

. NASA TECHNICALMEMORANDUM

NASA TM X-62,154

C

:E

2z

(NASA-TM-X-621- 5 4 ) LARGE-SCALE WIND-TUNNEL N72-24011

INVESTIGATION OF THE NOISE CHARACTERISTICSOF A SEMISPAN WING EQUIPPED WITH AN

EXTERNALLY BLOWN JET FLAP M.D. Falarski Unclas

(NASA) May 1972 118_p- .CSCL 01B G3/02 28204

LARGE-SCALE WIND-TUNNEL INVESTIGATION OF THE

NOISE CHARACTERISTICS OF A SEMISPAN WING

EQUIPPED WITH AN EXTERNALLY BLOWN JET FLAP

Michael D. Falarski

Ames Research CenterandU. S. Army Air Mobility R&D LaboratoryMoffett Field, Calif. 94035

Reproduced by

NATIONAL TECHNICALINFORMATION SERVICE

U S Deportm,'t If CommerteSpringld VA 2215

May 1972

p - | ) A)

Page 2: . NASA TECHNICAL MEMORANDUM

- 1 -

SUMMARY

A wind tunnel investigation was made of the noise

characteristics of a 4.42 m(14.5 foot) semispan, externally-

blown Jet flap model. The model was equipped with a single

76.2 cm(30 inch) diameter, ducted fan with a 1.03 pressure

ratio. The effects of flap size, fan vertical location,

and forward speed on the noise characteristics were studied.

This report presents the data from the investigation

in the form of tabulated one-third octave band frequency

spectrums and perceived noise levels for each test condition.

Page 3: . NASA TECHNICAL MEMORANDUM

- 2-

INTRODUCTION

STOL aircraft will operate from airports within areas

of high density population. They will therefore,be required

to operate at noise levels substantially lower than todays

commercial aircraft. For this reason the acoustic as well

as,the aerodynamic characteristics of the Externally-blown

Jet Flap(EBF) STOL concept are being investigated. The

results of small scale investigation of the noise charac-

teristics of the EBF and several other S'OL concepts are

reported in reference 1.

This paper presents the results of an investigation under-

taken to study the effects of forward speed, flap size, -And

vertical fan location on the acoustic characteristics of an

EBF powered by a low pressure ratio fan. As an acoustic

source this type of propulsive device is dominated by the

blade-passage tones and not Jet exhaust noise.

The model was a 4.42 m(14.5 feet) semispan wing

powered by a 76.2 cm(30 inch) diameter ducted fan with a

pressure ratio of 1.03. The tests were performed in the Ames

40-by 80-Foot Wind Tunnel.

The longitudinal aerodynamic characteristics were also

investigated. They are reported in reference 2.

Page 4: . NASA TECHNICAL MEMORANDUM

- 3 -

NOTATION

b wing semispan measured from the end plate, m(ft).

cf flap chord, streamwise, m(ft).

cw wing chord, streamwise, m(ft).

O, gross thrust coefficient, rosthrust

D ducted fan exit diameter, m(ft).

L lift, n(lb).

PNL perceived noise level, PndB.

q free-stream dynamic pressure, n/sq m(lb/sq ft).

R resultant force, JL +X , n(lb).

S wing area, ni(ft2).

SPL sound pressure level, dB ref. .0002 microbars.

T ducted fan gross thrust, n(lb).

X longitudinal force parallel to thrust axis, n(lb).

on angle of attack referenced to wing chord, deg.

SP deflection of last flap element referenced to wing

chord, deg.

angle of the static resultant force vector with

respect to the thrust axis, deg.

Z vertical location of fan axis with respect to wing

chord, cm(in).

Page 5: . NASA TECHNICAL MEMORANDUM

-4-

MODEL DESCRIPTION

Basic Model

Photographs of the model installed in the wind tunnel

and model preparation area are shown in figure 1. The basic

geometry of the model is presented in figure 2 and Table I.

The end plate was attached to the wing while the fairing

was isolated from the model.

The geometry of the ducted fan is presented in figtre

3(a) and Table I. The blade plan-form curves for the 8

bladed, 1.03 pressure ratio fan are presented in figure 3(b).

The static thrust as a function of fan speed is presented in

figure 3(c). Shown in figure 3(d) is the variation of fan

gross thrust coefficient with free-stream dynamic pressure.

Flap System

The three flap systems tested are shown in figure 4(a).

The reference dimensions for the systems are given in Table I.

Flap I is a large chord, triple slotted flap. The geometric

details are shown in figure 4(b). This system was made by

attaching a modification to the aft flap of flap III. Flap

II is a large chord, double slotted flap. For this system

the first element of flap I was set at 0, the first slot sealed

and the remaining two elements deflected. Flap III is a

smaller chord, double slotted flap. Its basic geometry is

shown in figure 4(c) and its coordinates are given in Tables

Page 6: . NASA TECHNICAL MEMORANDUM

-5-

II and III. This system is very similar to the flap used on

the propeller driven, deflected-slipstream STOL model re-

ported in reference 3.

Ducted Fan Pylons

The model was tested with the ducted fan mounted at

three vertical distances below the wing. The duct positions

are described in figure 5. Mounted on the long pylon, the

fan was 1.25 diameters below the wing chord line. The

medium pylon positioned the fan .79 diameters below the wing.

The cross section of the pylon is also shown in figure ~.

With the pylon removed the fan was mounted .33 diameters

below the wing, allowing a portion of the fan slipstream to

flow over the top of the wing.

Page 7: . NASA TECHNICAL MEMORANDUM

-6-

TESTS

The tests at forward speed were performed at an angle

of attack of 0 degrees. Limited tests were performed at

other c* 'a. Gross thrust coefficient was varied by varying

free-stream dynamic pressure with the fan rotational speed

set at 5000 RPM. The gross thrust was determined from a

calibration of fan exit total pressure Versus static ducted

fan thrust. C, was varied from 0 to 6.

The other test variable was flap deflection. Data

were recorded at deflections of d, 30, 60, and 90 for each

of the flap systems and pylons.

'he static(q= 0 n/m2) noise characteristics were in-

vestigated with the model installed in the 40-by 80-Foot

Wind Tunnel model preparation area as shownlin figure l(b).

As shown in figure 6 the microphones were arranged in a

semicircle around the undersurface of the wing. The micro-

phones were mounted in the span wise plane of the ducted fan

and spaced at 20 increments. This microphone arrangement

was the same as used in the wind tunnel, except for the wind

tunnel tests, the semicircle radius was 6.1 m(20 ft) instead

of 7.62 m(25 ft).

The isolated ducted fan was also tested statically as

shown in figure l(c). In this case the ducted fan was

mounted on the long pylon which was attached to a steel spar.

The upper portion of the spar was wrapped with sound absorption

Page 8: . NASA TECHNICAL MEMORANDUM

-7-

material to prevent sound reflection.

The noise data was measured with Bruel and Kjaer 1.27 cm

(1/2 in.) diameter, type 4133, condenser microphones and re-

corded on an Ampex F1300A multichannel tape recorder. For

the wind tunnel test the microphones were equipped with

wind-shield nose cones and oriented into the wind. During

the static tests, microphones 1-5 were also equipped with the

nose cones. In this case, all of the microphones were directed,

at the fan.

Page 9: . NASA TECHNICAL MEMORANDUM

-8-

CORRECTIONS

The data have been corrected for reverberations in the

wind tunnel test section and model preparation area. The

test section corrections were derived from an acoustic in-

vestigation reported in reference 4. The model preparation

area reverberation was measured with the dodecahedron sound

system described in reference 4. The static test data Uh's

been corrected using these results.

The data recorded in the wind tunnel has been extrapolzitd

to 7.62 m(25 ft), equivalent to the static test distance.

Microphones immersed in the relatively high velocity

turbulent fan slipstream had high sound pressure levels at

low frequency due to the turbulent airflow and vibration. The

data reflects this false sound source, so care must be taken

in the interpretation of data at low frequencies.

The one-third octave band frequency analysis was com-

puted with a Bruel and KJaer Real Time Analyzer. The data

were integrated over a period of 30 seconds or longer.

6

Page 10: . NASA TECHNICAL MEMORANDUM

-9-

PRESENTATION OF DATA

The results of the EBF semispan acoustic investigation

are presented in tabular form in tables V to XXIV. A summary

of these tables is given in Table IV. Each table consists

of a one-third octave band frequency spectrum, overall

sound pressure level, and perceived noise level for each

microphone of a given test condition. The uncorrected over-

all SPL listed in the tables is the OASPL measured directly

without reverberation correction. The gain is an indication

of the microphone amplifier output level with respect to a

microphone calibration level.

The static aerodynamic characteristics of the semispan

wing are presented in figure 7. The static turning effi-

ciency and effectiveness are shown in this figure.

Page 11: . NASA TECHNICAL MEMORANDUM

- / C) -

REFERENCES

1. Dorsch, R. G.; KreJsa, E.A.; and Olsen, U.A.: Blown

Flap Noise Research. AIAA paper 71-745, Am. Inst.

Aero. and Astronaut., June, 1971.

2. Falarski, M.D.; and Aiken, T.N.: Large-Scale Wfind-

Tunnel Investigation of a Semispan Wing Equipped with

an Externally-Blown Jet Flap. NASA TYX-62,079, 1971.

3. Page, V.R.; Dickinson, S.C.; and Deckert, A.H.: L-rge-

Scale Wind-Tunnel Tests of a Deflected Slipstream

STOL Model with Wings of Various Aspect Ratios. NIASA

TN D-4448, 1968.

4. Bies, David Alan: Investigation of the iFeasibility of

Making Acoustic Measurements in the NASA Ames 4C-by80-

Foot Wind Tunnel. NASA CR-114352, 1971.

Page 12: . NASA TECHNICAL MEMORANDUM

- / -

TABLE I. - REFERENCE DIMENSIONS

Flap I:

Wing area, S, m 2(ft2 )

Wing chord, cw, m(ft)

Flap chord, cf, m(ft)

Cf/cw

cf/Ds

Flap II:

Wing area, S, m2(ft2 )

Wing chord, c w, m(ft)

Flap chord, cf, m(ft)

Cf/Cw

cf/Ds

Flap III:

2 2Wing area, S, m (ft2 )

Wing chord, c, m(ft)

Flap chord, cf, m(ft)

Cf/cw

cf/DS

Semispan, b, m(ft)

11.0(118.4)

2.49(8.17)

1.62(5.30)

0.65

2.12

11.0(118.4)

2.49(8.17)

1.28(4.19)

0.514

1.68

7.40(79.8)

1.68(5.5)

0.71(2.31)

0.42

0.93

4.42(14.5)

Page 13: . NASA TECHNICAL MEMORANDUM

TABLE I. - Continued

Pylons Z,:m(ft)

Long Pylon 0.96(3.13)

Medium Pylon 0.604(1.98)

No Pylon 0.253(0.83)

Ducted Fan

Duct

Inside Diameter, m(ft)

Exit Diameter, m(ft)

Chord, m(ft)

Fan Station, percent of duct chord

Z/D

1.24

0.79

0.33

.0.762(2.5)

0.762(2.5)

0.655(2.146)

35.13

Fan

Planform curves

Number of Blades

Hub-to-Tip Diameter Ratio

Blade Angle at Tip, deg

Approx. Blade Tip Clearance, cm(in)

Pressure Ratio

see figure 3(b)

8

0.533

30

0.81(0.032)

1.03

Page 14: . NASA TECHNICAL MEMORANDUM

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Page 15: . NASA TECHNICAL MEMORANDUM

TABLE III.- Basic Wing Coordinates

UPPER SURFACE

CHORDWISE ORDINATESTATION

00.420.741.393.106.57

10.0513.5720.6127.7534.8042.0049.0057.4063.2570.2577.5084.6093.80100.00

01.932.383.114.456.407.909.1311.0112.4113.4114.0514.3514.3013.9513.3312.4911.4010.198.52

LOWER SURFACE

CHORDWISE ORDINATESTATION

00.9851.372.123.947.5211.0514.5721.5528.5535.3042.4749.4556.4063.3570.3077.3078.7084.3091.30100.00

0-1.63-1.96-2.47-3.33-4.50-5.35-6.01-6.98-7.65-8.05-8.22-8.16-7.87-7.37-6.73-5.88-5.743.948.198.40

Leading Edge Radius - 1.171

CHORD = 1.194 m (47.0 inches)

All Dimensions in Percent Chord

Page 16: . NASA TECHNICAL MEMORANDUM

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Page 20: . NASA TECHNICAL MEMORANDUM

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