EXPERIMENTAL INVESTIGATIONS ON SEMIADIABATIC DIESEL ENGINE WITH EXHAUST GAS RECIRCULATION FUELLED WITH TAMARIND BOIDIESEL

Particulate emissions and nitrogen oxide (NOx) levels are exhaust emissions from compression ignition (CI) engine. Once they are inhaled-in, they cause health hazards, besides environmental impact. Hence control of these emissions are important and an urgent task. In the context of depletion of fossil fuels, ever increase of fuel prices in International Market causing economic burden on developing countries and increase of pollution levels with fossil fuels the search for alternative fuels has become pertinent. Vegetable oils have high viscosity and low volatility causing combustion problems in diesel engine. Biodiesel produced from feedstock by the process of esterification are renewable in nature, biodegradable, provide energy security besides addressing environmental concerns. However, drawbacks of high viscosity, low volatility call for low heat rejection (LHR) or Semi Adiabatic diesel engine (SAD e). Investigations are carried out to evaluate the performance with different operating conditions (normal temperature and preheated temperature) of tamarind biodiesel with low heat rejection diesel engine consisting of air gap insulated piston with stainless steel, a low thermal conductivity material and air gap insulated liner with stainless steel insert with varied injection timing and injection pressure with provision of exhaust gas recirculation (EGR) with Tamarind biodiesel with diethyl ether as additive.