Amultistage axial flow compressor is required for compressing air at 20°c, through a pressure ratio of 5, each stage is to be 50% reaction and mean blade speed 275 m/s. flow co-efficient is 0.5 and stage loading factor is 0.3 (taken constant for all stages for simplicity). a) determine the flow angles and number of stages required if polytropic efficiency is 59%. take cp =1.005 kj/kg/k. b) calculate overall efficiency.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?