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A diesel engine is fitted with a turbocharger. The engine is tested at constant speed of...

A diesel engine is fitted with a turbocharger. The engine is tested at constant speed of 500 r.p.m at atmospherie conditions of I bar and 27 C, the power output is 7000 kW, bmep is 15 bars and fuel consumption is 1250 kg/h an air intake manifold pressure is 2.3 bars, exhaust manifold pressure is 1.8 bars, and turbine inlet gas temperature is 670 C and leave the turbine a pressure of 1 bar. The volumetric efficiency of the engine is 100% and the mechanical efficiency between turbine and compressor is 100%. The air compressor of the turbocharger has an isentropie eff. Of 70%. Calculate the isentropic efficieney of the turbine. Assume Cp 1.005 kJ/kg.K, k = 1.4 for air, &Cp = 1.05 kJ/ kg.K, K=1.33 for exhaust gasses.

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