Effect of Injection Timing in Direct Injection Diesel Engine using Plastic Oil Diesel Blends with Biodiesel as an Additive

Abstract

Environmental Concern and depletion in petroleum reservoirs caused interest in search of alternate energies for internal combustion engine. Waste plastic materials being non-biodegradable, can be suitably processed using pyrolysis to obtain liquid fraction which has properties like petroleum fuels. 20% plastic oil (PO) blends with diesel may be utilized in diesel engines. However, adding biodiesel by 20% being renewable in nature reduces emissions. In the present work 20% PO and 20% biodiesel blend is considered to access the impact of injection timing on the engine performance. Engine tests were performed at four different injection timing 23⁰, 21⁰, 19⁰, 25⁰ and 27⁰ before TDC. The blend (PO20+60D+B20) showed improved performance with advancing of injection timing with higher in-cylinder pressures and rapid heat release rate. Retarding the injection timings results in early combustion before the working stroke which reduces thermal efficiency. Further retarded IT of 19^o bTDC results in lower in-cylinder pressures which lead to reduced engine performance. However, advancing IT to 21⁰ improvements in engine performance with higher BTE, and lower emissions of HC, CO, and Smoke respectively with higher NOx.