Modelling and simulation of flow through a flowbench

MODELING AND SIMULATION OF FLOW THROUGH A FLOWBENCH

OBJECTIVE For this project, you will create a 3D model of a flow bench and run flow analysis. We will be obtaining a plot of lift vs mass flow rate

INTRODUCTION

FLOWBENCH 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.

It is used primarily for testing the intake and exhaust ports of cylinder heads of internal combustion engines. It is also used to test the flow capabilities of any component such as air filters, carburetors, manifolds or any other part that is required to flow gas. A flow bench is one of the primary tools of high performance engine builders, and porting cylinder heads would be strictly hit or miss without it.

A flow bench consists of an air pump of some sort, a metering element, pressure and temperature measuring instruments such as manometers, and various controls

VALVE LIFT The valve lift is the distance by which the valve is raised from its seated position when it is fully opened.

PROCEDURE

1. Modelling the flowbench (as suitable dimension)

2.Dimension given to the valve sketch for fully defined sketch.

3.Applying lid on both inlet and outlet port of the flowbench

Create new project and apply new setup for wizard as

i.internal flow

ii.air as working fluid

iii. rest as default

4.appling global mesh setting 04 as well as local mesh setting 05 .

Local mesh for the valve handle and base surface so the mesh will redefine across the surface for getting better visualization

5.adding boundary condition

Environment pressure at inlet @ 501325 pa.

Static pressure at outlet @ 101325 pa

6. adding a surface goal of mass flow rate on outer lid 2

7.adding cut plot in fornt plane for velocity and pressure

8.adding a flow trajectory from input face with 100 pipe as well as 100 arrow between the inlet and the outlet lid2

9.we two parametric study in which

i.input parameter as a different global mesh value as 4 , 5 and 7

ii.input parameter as a valve lift for the value of 4mm,5mm,6mm,7mm,8mmand 9mm. (global mesh size is 5)

RESULT

STUDY 01 GRID DEPENDENCY TEST

NOTE :- HERE WE NEED TO STOP THE CALCULATION FOR THE GLOBAL MESH SIZE 07 AFTER A 100 ITRATION BECAUSE IT TAKES TOO MUCH TIME FOR CALCULATION

THESE ARE THE FOLLOWING PLOT

GLOBAL MES VELOCITY PRESSURE TRAJECTORY

04

05

07

MASH FLOW RATE GRAPH

STUDY 02 PARAMETRIC STUDY

AT 04 MM

VLOCITY PLOT

PRESSURE PLOT

TRAJECTORIES

AT 05 MM

VLOCITY PLOT

PRESSURE PLOT

TRAJECTORIES

AT 06 MM

VLOCITY PLOT

PRESSURE PLOT

TRAJECTORIES

AT 07 MM

VLOCITY PLOT

PRESSURE PLOT

TRAJECTORIES

AT 08 MM

VLOCITY PLOT

PRESSURE PLOT

TRAJECTORIES

AT 09 MM

VLOCITY PLOT

PRESSURE PLOT

TRAJECTORIES

GRAPH FOR VARIATION OF MASS FLOW RATE WITH VALVE LIFT

CONCLUSION :-

1. FROM THE GRAPH, WE SAY THAT AS THE VALVE LIFT INCREASES ,THE INLET VELOCITY INCREASES
2. as the valve lift increase , the mass flow rate also increase with decreaseing slop so we can say that after a finite valve life mass flow rate will indepenent of valve lift.
3. as we increse the mesh value the curve or countour will get more fine and accurate.