The combustion characteristics of compression ignition engine fuelled partially by LPG-Diesel blends (Simulation study)

Abstract

This paper proposes a numerical investigation of the behavior of the dual diesel-Liquefied Petroleum Gas (LPG) engine. Numerical analysis is performed with the aid of the simulation program Diesel-RK. Three volumetric LPG blends: 5 % LPG, 8 % LPG, and 10%LPG are inducted with air intake for a single cylinder,4-stroke, constant speed diesel engine with a fixed compression ratio of 15.5/1. No dramatic change in combustion pressure is seen for 5%,8%, and 10% LPG compared to the case of 0% LPG (diesel only). Diesel's maximum energy production is 32.53 (1/deg.) at 365 degrees BTDC, and this is lowered to 30.28 (1/deg.) at the same crank angle when using 10% LPG. Maximum temperature and pressure rise a little bit by 0.14 % and 0.41 % for 10 % LPG. Increasing the LPG injection rate reduces volumetric efficiency and mechanical efficiency slightly. The results found a slight increase in NOx and a considerable reduction is captured in Bosch smoke number (BSN) when LPG is used with diesel. The obtained is validated with the findings of other researchers.