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

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Mechanical Engineering

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

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