Effect of Tangential Grooves on Piston Crown Of D.I. Diesel Engine with Retarded Injection Timing

Direct injection diesel engines are in service for both heavy duty vehicles, light duty vehicles not only in the fields of agriculture and transport sectors, but also stationary engines consume maximum percentage of petroleum based fuels and have the evident benefit of a higher thermal efficiency than all other engines. However, the D. I. Diesel engine emits significant amount of pollutants such as CO, UHC, NOx, smoke etc, which are harmful to the environment. In the present experimental attempt is made to study the influence of injection timing on the performance, emission characteristics of a single cylinder, direct injection diesel engine (base line engine) and tangential grooved piston engine (TGPE) has been experimentally investigated. The tests are performed at three fuel injection timings of 23 0 ,20 0 and 17 0 before TDC. When compared with the standard injection timing of 23 0 , the retarded injection timing from 23 0 to 17 0 decreases the emissions of oxides of nitrogen, carbon monoxide and increases thermal efficiency under all test conditions. From the experimental investigations, it is concluded that the base line engine with tangential grooves on piston (TGPE) with retardation injection timing gives better performance in all aspects and reduces emissions.