PERFORMANCE CHARACTERISTICS EVALUATION OF VALVED PULSED-JET ENGINE USING PURE PETROLEUM AND BIO-FUELS

摘要

Valved pulse-jet (PJ) engines have been introduced with the idea of using the elastic properties of air to generate power pulses. They are organized and developed from homes, laboratory workshops, researched at university and companies with a view to find these suitable for unmanned air vehicles (UAV) and power model aircraft. The presently available PJ engines are cheap to manufacture, but they consume an enormous amount of fuel running as they do on aqueous fuels like petrol, which is not only costly but also increases air pollution harmful to the environment. To improve the performance without wholly redesigning the engine environmentally friendly fuels such as Biofuels like ethanol could be investigated and employed. Various fuel blends are prepared using 10%, 20%, and 30% of ethanol and propane gas mixed with petrol. Performance parameters such as Specific Fuel Consumption, Fuel Flow rate, axial thrust, Exhaust temperature, and combustion temperature are studied for a number of runs. Performance characteristics of each fuel blend were gathered using various measuring devices through experimental trials. An experimental test rig was constructed to accept an ethanol blend using a liquid fuel delivery. The 10% blended fuel decreased the pollution as well as making fuel cheaper by providing low consumption rate and complete combustion with low exhaust temperature. Hence, biofuels act as alternate or blended fuels.