“Getting busy with the fizzy” Design and analysis of a mixing head for a Demonstrator scale Hydraulic Air Compressor Angelina Romanelli Rocha Flavia de Carvalho Vespucio
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“Getting busy with the fizzy”Design and analysis of a mixing head for a
Demonstrator scale Hydraulic Air Compressor
Angelina Romanelli RochaFlavia de Carvalho Vespucio
The feasibility assessment was divided into four main tasks
• There were four main tasks:
Background research & understanding;
Rough calculations;
(Bernoulli’s principle)
Airfoil design
Flowrate𝑃1 +1
2𝜌𝑣1
2 + 𝜌𝑔ℎ1
= 𝑃2 +1
2𝜌𝑣2
2 + 𝜌𝑔ℎ2
Hydraulic Air Compressor was an important source of renewable energy
• The first Hydraulic Air Compressor (HAC) was developed by Charles Taylor in 1890 in Ontario, Canada.
• HAC had the function to be a renewable source of energy that has fallen into disuse due to electricity which was more marketable form of energy than compressed air.
As a part of a feasibility study of an air compressor based on Taylor's model, our work was developing a design for the Head Piece placed on the top of the hydraulic air compressor system.
The head for testing on the prototype HAC has all the dimensions proportional to the original except, the pipes and the airfoils which were maintained.
Bernoulli’s equation was used to establish the water velocity on plane X2.
1 2
P(Pa) 101325 100523.7
ρ (kg/m3)
g (m/s2)
h (m) 0 0.06939
v (m/s) 0 0.491581
Q (m3/s)
Parameters
999.975
9.80665
0.0085
Bernoulli’s equation
𝑄 = 𝑣𝐴
𝑃1 +1
2𝜌𝑣1
2 + 𝜌𝑔ℎ1 = 𝑃2 +1
2𝜌𝑣2
2 + 𝜌𝑔ℎ2
X1
X2∆h
Test to obtain the best airfoil shape we used a CFD code called Flow Simulation in SolidWorks.
• Parameters:
– Fluid: water;
– Initial velocity for water: 0.5m/s as obtained through the first calculations;
– 2D simulation;
– Standard Temperature and Pressure.
NACA 0012
NACA 0015
NACA 0016
NACA 0018
NACA 0020
NACA 0030
Airfoil NACA-0030 produced the greatest pressure drop which was considered the best to draw in the air by suction.
Pressure (Pa)∆P
NACA max min
0012 101468 101276 192
0015 101479 101268 211
0016 101481 101266 215
0018 101491 101247 244
0020 101490 101238 252
0030 101515 101206 309The largest pressure variation
Bernoulli's equation was the basis of the preliminary pressure drop analysis. 1
2∆h
Bernoulli’s equation
𝑄 = 𝑣𝐴
𝑃1 +1
2𝜌𝑣1
2 + 𝜌𝑔ℎ1 = 𝑃2 +1
2𝜌𝑣2
2 + 𝜌𝑔ℎ2
The Bernoulli results show the expected behavior for the pressure drop excluding the shock losses.
Po (Pa) 101325
p (kg/m3) 999.975
g (m/s2) 9.80665
h0 (m) 0
vo (m/s) 0
Q (m3/s) 0.0085
Parameters
Based on a range of water flowrate allowed for the compressed air system, some tests were run with Flow Simulation tool of SolidWorks.
• Parameters:
– Fluid: water;
– 3D simulation;
– Standard Pressure was set up on
the top lid.
– Flowrate was set up on the bottom lid.
Flowrate: 0.005 m^3/s
Flowrate: 0.006 m^3/s
Flowrate: 0.007 m^3/s
Flowrate: 0.0085 m^3/s
The flowrate 0.0085m3/s produced the greatest pressure drop between the pipes and airfoils (the greatest suction).
Flowrate (m³/s)
Pressure (Pa)∆P
max min
0.005 101317 101146 171
0.006 101313 101068 245
0.007 101309 100976 333
0.0085 101302 100812 490
The largest ∆P, thus the flowrate should be 0.0085m³/s
The best Head Piece design was defined according to analysis and compilation of all results obtained.
The end of pipes have to be located at this height, because this area has the lowest pressure
Flowrate: 0.085 m^3/s Airfoil: NACA 0030
Thank you!
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