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1)(a) describe the flow pattern from leading to trailing edge of a cambered aerofoil blade in a turbo Machine.

(b) Describe the Reheat and Preheat phenomena in Turbines and Compressors.            

2)(a) Low Pressure air Compressor develops the pressure of 1500 kgf/m2. If initial and final states of air P1 = 1.02 bar, T1 =  300K and T2 =  315 K. Find out the compressor and infinitesimal stage efficiencies.

(b) prepare down the losses in turbo Machines.

3) A centrifugal fan has the data given below:

Inner Diameter of the impeller = 18 cm
Outer diameter of the impeller = 20 cm
Speed = 1450 rpm

Relative and absolute velocities respectively are:

At Entry = 20 m/s, 21 m/s
At exit = 17 m/s, 25 m/s
Flow rate = 0.5 kg/s
Motor efficiency = 78%

Find out:

(a) the stage pressure rise
(b) Degree of reaction
(c) The power required to drive the fan

Take density of air 1.25 kg/m3.

4) The axial fan stage consisting of only the rotor has the following data:

Rotor blade air angle at exit = 10o
Tip Diameter = 60cm
Hub Diameter = 30 cm
Rotational Speed = 960 rpm 
Power required = 1 KW
Flow co-efficient = 0.245
Inlet flow conditions (P1) = 1.02 bar
Inlet flow conditions (T1) = 316 K

Find out:

(a) the rotor blade angle at entry

(b) Stage pressure rise

(c) Overall efficiency

5) Stage of a turbine with Parsons blading delivers dry saturated steam at 2.7 bar from fixed blades at 90 m/s. Mean blade height is 40 mm, and moving blade exit angle is 20o. Axial velocity of steam is ¾ of the blade velocity at mean radius. Steam is supplied to the stage at the rate of 9000 kg/hr. The effect of blade tip thickness on the annulus area can be neglected, compute

(a) the wheel speed in rpm

(b) the diagram power

(c) the diagram efficiency

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M913317

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