Abstract—Due to the increasing demand for fossil fuels and environmental threat, a number of renewable sources of energy have been studied worldwide. An attempt is made to assess the suitability of vegetable oil for diesel engine operation, without any modifications in its existing construction. One of the important factors which influence the performance and emission of diesel engine is fuel injection pressure. In the present investigation vegetable oil, Nelli oil has been investigated in a constant speed, DI diesel engine with varied fuel injection pressures (180, 200 and 220 bar). The main objective of this study is to investigate the effect of injection pressures on performance and emissions characteristics of the engine. The injection pressure was changed by adjusting the fuel injector spring tension. The performance and emission characteristics were presented graphically and concluded that increase in injector opening pressure increases the brake thermal efficiency and reduces unburned hydrocarbon and smoke emissions significantly.

Index Terms—Diesel engine, Vegetable oil, Nelli seed oil, Fuel

Cite: M L S Deva Kumar, M Venkata Ramudu, and K Vijaya Kumar Reddy, "Effect of Injection Pressure on the Performance and Emission Characteristics of Di Diesel Engine Running on Nelli Oil and Diesel Fuel Blend," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 1, pp. 130-137, January 2014.