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Modelling and simulation of flow through a flowbench
Introduction: An air flow bench is a device used for testing the internal aerodynamic qualities of an engine component and is related to the more familiar wind tunnel. The Mass flow rate is defined as the rate of movement of liquid mass through a unit area. The mass…
Aravind T
updated on 21 Aug 2020
Introduction:
An air flow bench is a device used for testing the internal aerodynamic qualities of an engine component and is related to the more familiar wind tunnel.
The Mass flow rate is defined as the rate of movement of liquid mass through a unit area. The mass flow is directly depended on the density, velocity of the liquid and area of cross-section. It is the movement of mass per unit time.
Objective:
Creating a 3D model of a flow bench and run flow analysis.
- Grid dependence test - For three grids run your simulation at a particular valve lift and interpolating the results.
- Effect of valve lift on mass flow rate - Once the best grid is decided, run a parametric sweep to show the effect of valve lift on mass flow rate.
Fluid considered - water
Flow bench design:
Boundary conditions:
Inlet-1 bar
outlet- 0.5 bar
GRID DEPENDENCY TEST:
CASE 1:
CASE 2:
CASE 3:
| CASE | GRID X-direction | GRID Y-direction | GRID Z-direction |
PRESSURE(Pa) MAX |
VELOCITY(m/sec) MAX |
Remarks |
| 1 | 20 | 40 | 20 | 93956 | 9.307 | good |
| 2 | 40 | 80 | 40 | 93737 | 10.733 | comparitively good than case 1 |
| 3 | 60 | 120 | 60 | 95430 | 11.46 | Fine plots are obtaind which can show the pressure and velocity clearly |
Flow visualization:
valve lift:
| Goal (Value) | Design Point 1 | Design Point 2 | Design Point 3 | Design Point 4 | Design Point 5 | Design Point 6 | Design Point 7 | Design Point 8 |
| valve Lift [m] | 0.001 | 0.002285714 | 0.003571429 | 0.004857143 | 0.006142857 | 0.007428571 | 0.008714286 | 0.01 |
| GG Mass Flow Rate [kg/s] | 1.61559E-06 | -9.39451E-06 | -6.90393E-07 | 3.88992E-06 | -1.25195E-05 | -6.45421E-06 | -7.31396E-06 | -1.40826E-05 |
| SG Mass Flow Rate [kg/s] | -0.19323926 | -0.320606172 | -0.387515387 | -0.41820506 | -0.427463539 | -0.433615176 | -0.435732899 | -0.436132448 |
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Conclusion:
1. The grid dependency test can give how the fine tuning of mesh can give the more accurate values. more and more increaing the grid the results will be more accurate.
2. The mass flow rate decreases as the valve lift increases.
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