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 2 years ago

The velocity of steam leaving the nozzle of a single-stage impulse turbine is 813 m/sec. The...

The velocity of steam leaving the nozzle of a single-stage impulse turbine is 813 m/sec. The nozzle angle is 20° and the blade speed corresponds to maximum blade efficiency. The moving blade is symmetric, assumed to be frictionless, and there is neither expansion nor contraction of the steam flow through the blade passage. Draw the velocity diagram and determine the relative velocity of steam leaving the blade.

A multi-stage gas turbine is to be designed with impulse stages, and is to operate with...

A multi-stage gas turbine is to be designed with impulse stages, and is to operate with an inlet pressure and temperature of 6 bar and 900 K, and an outlet pressure of 1 bar. The isentropic efficiency of the turbine is likely to be 85 per cent. All the stages are to have a nozzle outlet angle of 15 degrees, equal inlet and outlet blade angles, a mean blade speed of 250 m/s and equal 5 kJ/kg K o inlet...

Steam enters the nozzle of an impulse turbine stage at 60 bar and 500 °C and...

Steam enters the nozzle of an impulse turbine stage at 60 bar and 500 °C and leaves at 20 bar. Flow is adiabatic and reversible. The nozzle angle is 20°. The moving blade is symmetric, travels at optimum velocity, and assumed to be frictionless. It is also assumed that there is neither expansion nor contraction of the steam flow through the blade passage. Draw the velocity diagram and calculate (a) the blade efficiency and (b) the stage efficiency.

Steam at 50 Bar and 500oC is expanded isentropically through a single stage turbine to a...

Steam at 50 Bar and 500oC is expanded isentropically through a single stage turbine to a condenser operating at 1 bar. Assuming the steam at turbine exit is Dry Saturated Steam and the turbine is required to produce a power output of 5.33MW. Calculate the required steam mass flow rate in kg/s to 2 decimal places.

A single stage steam turbine is supplied with steam at 5 bars, 200 C at the...

A single stage steam turbine is supplied with steam at 5 bars, 200 C at the rate of 50kgmin. It exhausts into a condenser at a pressure of 0.2 bars. The blade speed is 400msec. Nozzles are inclined at an angle of 20 to the plane of the wheel and outlet blade angle 30. Neglecting friction losses, the power developed by the turbine will be?

The velocity of steam at inlet to a simple impulse turbine is 1200 m/s and the...

The velocity of steam at inlet to a simple impulse turbine is 1200 m/s and the nozzle angle is 21°. The blade speed is 500 m/s and the blades are symmetrical. Evaluate: The blade angles if the steam is to enter the blades without shock. If the friction effects on the blade are negligible, specify the tangential force on the blades and the diagram power for a mass flow of 0.85 kg/s. What are the axial thrust and the diagram...

Q2 A single stage nozzled axial flow gas turbine operates with 1000 K total inlet temperature...

Q2 A single stage nozzled axial flow gas turbine operates with 1000 K total inlet temperature and 4.8 bar inlet total pressure with 12 kg/s mass flow rate. The axial velocity throughout the stage is constant at 220 m/s and the blade speed is 350 m/s. The nozzle exit and the rotor exit angles are 65° and 7° respectively. The static pressure at the exit of the stage is 2.5 bar. Assuming equal inlet and exit absolute flow velocities, determine:...

A stage-discharge relationship is an inexpensive tool for obtaining continuous records of river discharge. Using sketches,...

A stage-discharge relationship is an inexpensive tool for obtaining continuous records of river discharge. Using sketches, describe what you understand by a stage-discharge relationship and how it fills the role of a cheap alternative for continuous river flow measurement. What precautions must be taken in the long-term use of stage-discharge relationships? (c) Describe the dilution gauging method, emphasising the main differences between constant rate injection and gulp injection techniques. Starting from the basic mass balance equation, derive the equation for...

Estimate the number for stages required for the turbine which is a multi-stage axial turbine designed...

Estimate the number for stages required for the turbine which is a multi-stage axial turbine designed with impulse stages and operating with an inlet pressure and temperature of 6 bar and 900 K and outlet pressure of 1 bar. The isentropic efficiency of the turbine is 85 %. All the stages are to have a nozzle outlet angle of 75 degrees and equal inlet and outlet rotor blade angles. Mean blade speed is 250 m/s and the axial velocity is...

Consider a wind turbine comprised of two blades, with a radius of 63 ft., which delivers...

Consider a wind turbine comprised of two blades, with a radius of 63 ft., which delivers maximum power when the wind speed is above 16 knots (18.4 mph). The wind turbine is designed to produce 135 hp with an efficiency of 74%. The rotor is designed to operate at a constant speed of 45 rpm in winds over 5 knots (5.8 mph) by controlling system load and adjusting blade angles. Estimate the blade speed and power coefficient for the maximum...

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