DefinePK

Abstract

A review on the behaviour of the low compression ratio diesel engine is presented in this work. To incorporate new strategies which improve the performance of the diesel engine, the dynamic interaction between engine subsystems and their impact on combustion phenomenon has to be retrieved. Several studies have investigated the impact of compression ratio on the performance of diesel engine and its implications on the emissions. In general, diesel runs at higher compression ratios. At higher compression ratios, the NOx emission is high even though brake thermal efficiency is high. Low compression ratio technology can be the solution to this problem. It is proposed that the reduction in compression ratio would be beneficial to reduce the NOx emissions, thermal and mechanical stresses on the components of the engine. The main objective of this investigation was to understand the impact of lowering the compression ratio on the brake thermal efficiency and brake specific fuel consumption on the diesel engine by reducing the compression ratio from 17.5:1 to 13.7:1 in two steps by using thicker head gaskets. The test results revealed that as the compression was lowered, the NOx emission got reduced with a little penalty in HC and CO. The brake thermal efficiency is as well reduced and brake specific fuel consumption was increased when compared with the standard compression ratio of the engine.