IC Engine Test - Practical

  • Thread starter EngAngel
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1. The problem
DIESEL IC ENGINE
We were given a excel sheet, with RPM, Torque, Power, Bmep, Fuel mass flow rate, Airmass SFC, Engine Air inlet and Exhaust temp.

The engine capacity is 2.2litre 4 stroke.
Fuel specifications: 50 Cetane (0.05% Sulphur)
Coolant = Fresh water with 45% glycol mix.

I am having problems finding Volumetric Efficiency, the fuel calorific value and coolant specific heat.

Homework Equations


VE=(mRT/P)/(Vswept)
VE=(9411*HP*BSFC)/(displacement*RPM)


The Attempt at a Solution



I found a VE(volumetric efficiency) of 72.808% for the first speed of 1000RPM
with eq: VE=(9411*HP*BSFC)/(displacment*RPM)
=(9411*24.2*0.45)/(134*1000)

but seem to get the rest above 100% eg @2000RPM VE=133.856%
I have tried more than one equation, this seemed to get closer to the 70% VE it should be.

I also need to do a heat balance thus i require the calorific value of the diesel (it is not bio diesel fuel) as well as cp for the coolant.

Any assistance would be much appreciated.
 
Last edited:

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