engine classes: experimental test bed

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Christophe
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engine classes: experimental test bed




by Christophe » 28/04/08, 16:17

While searching the engine test bench report, I came across a report from TP which should interest the world or at least give bases as for the variations of the engine parameters on the output of a petrol engine.

Download here: TP IFP experimental engine

Report of practical work in engineering school - ENSAIS - on an experimental motor with variable parameters.

Purpose of the TP

The purpose of this TP is to highlight the influence on the behavior of a thermal engine of 3 parameters of fundamental settings:
-the richessee,
-the advance to ignition,
the compression ratio.

The tests are of course on a variable parameter, the other 2 fixed. We will highlight for each parameter the influence it has on:
-the specific consumption,
-the power
-the overall yield

These are similar tests that are carried out by the manufacturers on the test benches during the final design phase of an engine, in order to determine the electronic control settings (advance curve, injection curve ... ).

Of course, they take into account many more parameters, such as temperature resistance.

Experimental protocol

The Tp is carried out on an experimental single-cylinder engine of the French Institute of Petroleum IFP on which we have the following adjustment possibilities
- richness adjustment (carburetor)
- ignition advance adjustment (rotation of the ignition coil)
- adjustment of the compression ratio (experimental cylinder head with variable rate by translation)

The developed torque is absorbed by a hydraulic Froude brake. With the speed of rotation, the useful power is obtained directly. The power supplied is given by the air and petrol flow rates measured respectively by a diaphragm located on the air intake pipe (pressure difference between the inlet and the outlet in mm of water column) and by measuring the flow time (given volume of 100 mL located on the fuel supply line).
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