Diploma Thesis

Kiijärvi, J., A Research of Using Ethanol as a Fuel in a Diesel Engine Charged by Different Methods. Espoo 1984, Helsinki University of Technology, Internal Combustion Engine Laboratory, Report 45, 107 pp. (in Finnish, diploma thesis).

Abstract

In the thesis the properties of ethanol including ignition improver (EII) as a fuel of a high-speed diesel engine (Valmet 611 CSB) is studied. The test engine was charged by different methods.

The measurements were done with the same mean effective pressure at each rotational frequency. Diesel oil was used as a verifying fuel. The test engine was charged by turbo, Comprex and combined charging. The turbo and Comprex versions were tested both with and without charge air cooling. The combined version didn't have charge air cooling.

With EII the air/fuel ratio increased, exhaust emissions mostly reduced and the rise of pressure got lower compared to the diesel oil.

Without charge air cooling EII didn't give advantages, when Comprex and turbo charging was used. The charge air cooling with EII didn't improve the turbo version. The Comprex-version with charge air cooling and EII got the best results.

On the basis of the experiments turbo charging without charge air cooling is a good choice, when EII is used as fuel. If high demands in EII-use are needed, then Comprex charged version with charge air cooling is a good alternative.

Comment

Comprex charger is nowadays developed by Swissauto. They call it Hyprex charger.