Flowbench Simulation for Intake Port

1. Geometry:

All dimensions in mm.

 

2. Boundary Conditions:

Total pressure inlet = 4 bar

Static pressure outlet = 1 bar

Real wall = all inner surfaces of the cylinder, valve, and intake.

 

3. Grid dependence study:

Goal (Value) Design Point 1 Design Point 2 Design Point 3
Level of initial mesh (Automatic Mesh) 4 5 6
Level of Refining Fluid Cells (Local Mesh 2)  3 3 3
Level of Refining Fluid Cells (Local Mesh 3)  2 2 2
Level of Refining Fluid Cells (Local Mesh 4)  2 2 2
GG Max Velocity 1 [m/s] 472.10 505.70 513.55
SG Mass Flow Rate 1 [kg/s] -0.11 -0.11 -0.12

The maximum velocity increases as we refine the mesh and so does the mass flow rate. This clearly means that the truncation errors present in Design Point 1 wrt Design Point 3 is very large as compared with errors present in Design Point 2 wrt Design Point 3.

Both the Maximum Velocity goal and Mass flow rate goal were used in convergence. Based on the above data Design Point 2 i.e. with Initial Mesh level 5 is the best keeping in mind the computation resources available, rate of convergence and accuracy.

 

4. Effect of Valve lift on Mass Flow Rate:

Valve lift was varied from 1 mm to 8 mm with 7 intervals in between. The following results were obtained:

 

Complete Data of the Parametric study:

https://drive.google.com/open?id=1IuOb05V7SBMk5ccI7vW2ebd4TmKuwwi2

 

It is observed that the mass flow rate first increases linearly with the valve lift and then attains a constant value after a certain point. 

 

5. Pressure loss in Intake:

https://drive.google.com/open?id=1HNGydEvlrftuva9VVcTjA2ZXbGFWO8Cs

 


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