# Performance Test of a Compression Ignition Engine.

Essay by Matthew_stevenUniversity, Bachelor's November 2008

Performance Test of a Compression Ignition Engine

Matthew Steven, 0503527

## Aim

To investigate the fundamentals of a compression ignition (I.C.) engine with respect to performance by determining the efficiency and where losses occur.

## Objectives

The objective of this report is to:

Measure the performance of a compression ignition engine.

Measure the mechanical losses in the engine.

Measure the heat losses.

## Method

After allowing the engine to warm up the fuel control was set to maximum. Initially starting with no-load, the dynamometer loading was increased and all data was recorded in the 'Observed Results' table (page 5) before increasing the load and repeating. My investigation of my results comprised 3 parts.

Part A: Measure/Determine the performance of the compression ignition engine.

Using my recorded results from the 'Observed Results' table, I calculated:

Brake Power (kW)

Brake Mean Effect of Pressure, (Bp) (kN/m2)

Brake specific Fuel Consumption (L/kW - hr)

Brake thermal efficiency

These were then noted in 'Calculated Results: Table A' (Page 6).

I then proceeded to construct graphs of Torque, Power, Brake Specific Fuel Consumption and thermal Efficiency against the Brake Mean Effective Pressure (B.M.E.P) (Pages 7 - 10).

Part B: Measure/Determine the mechanical losses in the engine by extrapolating the Willans line.

For part B I plotted a graph of Fuel Consumption versus the B.M.E.P which allowed me to estimate the mechanical losses in the engine (page 11).

Part C: Measure/Determine the heat losses.

From my observed results I was able to determine:

Heat of combustion of fuel, H1

Brake Power output, P

Heat to exhaust, H2

Heating to cooling water, Q1

Other losses, Q2

These values where noted in Calculated Results: Table B: Heat Losses (page 12). These values allowed me to further calculate the percentage values of where heat losses occurred and to plot the graph of...