Products of combustion enter a gas turbine with a stagnation pressure of 0.90 MPa and a stagnation temperature of 840°C, and they expand to a stagnation pressure of 100 kPa. Taking k = 1.33 and R = 0.287 kJ/kg·K for the products of combustion, and assuming the expansion process to be isentropic, determine the power output of the turbine per unit mass flow.

Air with a mass of 3 kg is heated at a constant volume from a temperature of 25°C to 80°C. The process then takes place at constant pressure so that the gas has a temperature of 150°C. Determine the heat required and the entropy changes that occur during the process. (Air: Cp =1,005 kJ/kg. K and γ = 1.4; and assume Cp does not change against temperature)

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5.An ideal gas flows into a channel with an average velocity of 10 m/s from an inlet with 苏日 area of 1 m2. The gas is at 1000 kPa and 500°C. Determine the mass flow rate of the gas. The gas constant is 0.287 kPa.m^3/kg.K. ( )