FLOW BENCH ANALYSIS
OBJECTIVE:
TO CREATE A 3D MODEL OF A FLOW BENCH AND RUN FLOW ANALYSIS AND OBTAIN A PLOT OF LIFT VS MASS FLOW RATE.
- GRID DEPENDENCE TEST
FOR THREE GRIDS RUN YOUR SIMULATION AT A PARTICULAR VALVE LIFT AND EXPLAIN YOUR RESULTS.
- EFFECT OF VALVE LIFT ON MASS FLOW RATE
ONCE YOU HAVE DECIDED THE BEST GRID, RUN A PARAMETRIC SWEEP TO SHOW THE EFFECT OFVALVE LIFT ON MASS FLOW RATE.
INTRODUCTION:
1.THE CYLINDER IS DRAWN WITH A RADIUS OF 0.5 METERS AND WITH A HEIGHT OF 1 METER.THEN THE INLET PORT IS DRAWN AND USING GUIDELINES AND SWEEP TOOL.AFTER DRAWING THE INLET PORT, THE SKETCH OF VALVE IS DRAWN AND IS EXTRUDED . THE SKETCH OF THE VALVE IS CONSTRAINED. SO THE VALVE LIFT CAN BE CHANGED AT DIFFERENT LENGHTS.
GRID DEPENDENCY TEST:
THIS IS TO FIND THE BEST GRID FOR RUNNING THE SIMULATION .THREE GRIDS ARE USED AT PARTICULAR VALVE LIFT AND THE GRID WHICH SHOWS THE GOOD RESULTS IS SELECTED FOR FURTHER SIMULATION.
GRID AT LEVEL 4
VELOCITY PLOT:
PRESSURE PLOT:
GRID AT LEVEL 5
VELOCITY PLOT:
PRESSURE PLOT:
GRID AT LEVEL 6
VELOCITY PLOT:
PRESSURE PLOT:
IT IS OBSERVED THAT WITH THE INCREASE IN THE GRID LEVEL THE PATTERN APPEARS LIKE A SWIRL OF THE FLUID THAT HAPPENS INSIDE THE CYLINDER.SO PROPER RESULTS AND PLOT DESCRIPTION GRID LEVEL 0F 6 IS USED .FURTHER INCREASE IN GRID VALUE INCREASES OPTIMUM VALUES BUT IT ALSO INCREASES THE TIME OF COMPUTATION.
VALVE LIFT TEST:
PAREMETERS FOR VALVE LIFT
USING THE GRID SIZE OF 6, THE VALVE LIFT IS VARIED FROM 0.01m TO 0.1m WITH TEN INTERVALS BY PARAMETRIC ANALYSIS .IN THIS PARAMETRIC STUDY THE STUDY IS DONE OM PRESSURE PLOTS AND VELOCITY PLOTS AND MASS FLOW RATES FOR DIFFERENT VALV E LIFTS.
RESULTS:
VALVE LIFT =0.01m
VELOCITY PLOT
PRESSURE PLOT
VALVE LIFT =0.02m
VELOCITY PLOT
PRESSURE PLOT
VALVE LIFT=0.03
VELCOITY PLOT
PRESSURE PLOT
VALVE LIFT =0.04
VELOCITY PLOT
.
PRESSURE PLOT
VALVE LIFT=0.05
VELOCITY PLOT
PRESSURE PLOT :
VALVE LIFT =0.06
VELOCITY PLOT
PRESSURE PLOT:
VALVE LIFT=0.07
VELCOITY PLOT:
PRESSURE PLOT
VALVE LIFT =0.08
VELCOITY PLOT
PRESSURE PLOT
VALVE LIFT =0.09
VELOCITY PLOT
PRESSURE PLOT:
VALVE LIFT=0.1m
VELCOITY PLOT
PRESSURE PLOT
FROM THE VELOCITY AND PRESSURE PLOTS IT IS OBSERVED THAT THE VLEOCITY INCREASES WITH INCREASE IN THE VALVE LIFT AND PRESSURE DECREASES.
MASS FLOW RATE PLOT:
IT IS OBSERVED THAT THE MASS FLOW RATE REDUCES AS THE VALVE LIFT INCREASES.AS THE VALVE LIFT CONTINUE TO INCREASE ,LARGE INTAKE VALVE OPENING ALLOWS FOR GREATER INDUCTION MASS FLOW RATE.
CONCLUSION:
IT CAN OBSERVED THAT THE PRESSURE REDUCES WITH INCREASE OF VALVE LIFT DUE TO INCREASE IN DISTANCE BETWEEN THE VALVE OPEMING AND CYLINDER.AND PRESSURE INCREASES WITH INCREASE IN VALVE LIFT .HIGH PRESSURE LEADS TO SWIRLING EFFECT .