In a single stage impulse turbine, the nozzles discharge the fluid on to the blades at...

In a single stage impulse turbine, the nozzles discharge the fluid on to the blades at an angle of 25 o to the plane of rotation, and the fluid leaves the blades with an absolute velocity of 300 m/s at an angle of 120 o to the direction of motion of the blades. If the blades have equal inlet and outlet angles and there is no axial thrust, estimate the blade angle, power produced per kg/s of fluid, and diagram efficiency. Steam at 7 bar and 300 o C expands to 3 bar in an impulse stage. The nozzle angle is 20 o , the rotor blades have equal inlet and outlet angles, and the stage operates with the optimum blade speed ratio. Assuming that the isentropic efficiency of the nozzles is 0.9, and that the velocity at entry to the stage is negligible, deduce the blade angle used and the mass flow required for this stage to produce 75 kW. A ten-stage axial flow compressor provides an overall pressure ratio of 5:1 with an overall isentropic efficiency of 0.87, when the temperature of the air at inlet is 15 o C. The work is divided equally between the stages. A 50 per cent reaction design is used, with a blade speed of 220 m/s and a constant axial velocity through the compressor of 170 m/s. Estimate the blade angles.

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samet mamat answered 1 year ago

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