Consider a turbocharged SI engine, with an intercooler (i/c), as shown in the Figure for Q 2 below. The turbine of the turbocharger is driven by the exhaust gases first, thereby producing power to drive the turbo-compressor. The exhaust gases leaves the turbocharger turbine in the exhaust system of the engine after serving its purpose. The turbo-compressor and the turbocharger turbine are mounted on the same shaft. For a certain engine load and throttle positioning, the conditions are given as follows: • Turbo-compressor air inlet: Pressure is 100 kPa, temperature is 30°C, and the mass flow rate is 0.10 kg/s. • Turbocharger turbine inlet: Pressure is 170 kPa and the temperature is 650°C. • Turbocharger turbine exit (engine's exhaust system): Pressure is 100 kPa. Assume that both the turbine and the compressor are running at 120,000 rev/min and there is no entropy generation in them, and they have the same mass flow rates. Use standard symbols and sketch your own simple schematic diagram with all the prop- erty values displayed on it. Also, make other assumptions that are necessary for the solution to this problem. For air take c, =1.004 kJ/(kg-K) and y= 1.4. Determine: (a) The turbine exit temperature in °C. (b) The turbine power output in kW.

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