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Important information about Turbomachinery - Reaction Turbines
1) Steam at 15 bar and 350 degrees C is expanded through a 50% reaction turbine to a pressure of 0.14 bar. The stage efficiency is 80% for each stage and the reheat factor is 1.05. The expansion is to be carried out in 10 stages and the required power is 6000 kW. Calculate the steam flow required, assuming that the stages all develop the same work. At one stage the pressure is 1 bar (saturated vapour) and the blade speed ratio is 0.77. If the blade height is 1/20 of the blade mean diameter, calculate the value of the mean blade diameter and the rotor speed.
2) A 50% reaction turbine expands 34000 kg/hr of steam from 20 bar, 400 degrees C to a pressure of 0.2 bar. The turbine is designed such that the steam leaving is just dry saturated. The reheat factor is 1.05 and the isentropic efficiency of each stage is the same throughout. There are 14 stages and the enthalpy drop is the same in each. All blades have an exit angle of 22 degrees and the mean value of the blade speed ratio is 0.82. Calculate the stage efficiency, the diagram power, drum diameter and the blade height for the last row of blades. The turbine speed is 2400 rev/min.
Assume that viscous effects are negligible Plot this data using appropriate dimensionless groups
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How do I find the factor of safety using the distortion energy failure theory?
Package Design Brief: Assume you are the packaging engineer for a large consumer products company. In this company, the Packaging Design Briefs are initiated by the marketing group and forwarded to the Package Engineering group.
Solve the problem in the image. Do it step wise in detail. This question is from book "Fracture Mechanics - An Introduction - E. Gdoutos Springer (Page 74)"
What will the ratio of the angle of twist be to that of the hollow shaft if the maximum shear stress in the material of 75 N / mm ^2 and what is the ratio of actual permissible shear stress?
Cantilever Beam with maximum tensile strength. A cantilever beam is to be made using a symmetrical I section beam. The cantilever is to carry a load of 40kN at a distance 2.5m from the fixed end. The situation allows for a depth of I beam to be no..
A rigid tank with a volum of 2.5m^3 contains 5kg of saturated liquid-vapor mixture of water at 75deg C. Now the water is slowly heated. Determine the temperature at which the liquid in the tank is completely vaporized
Calculate the crack length after cycles and subjected to a cyclic stress normal to the crack
The humidity of air can be determined by use of two different thermometers; a 'dry bulb' thermometer and a 'wet bulb' thermometer. explain how these thermometers can be used to estimate the amount of water vapour in the air.
Determine the velocity of shearing along the shear plane and the velocity of sliding at the tool-chip interface and find the work done per minute in shearing the metal and against the friction.
In the idealized model attached shown, m = 15 kg, k = 135 N/m, and the viscous damping ratio is 0.15. Assume that an external harmonic force F(t) = 15 cos 4 t acts on the system with F0=15 N and forcing frequency of 4 rad/s.
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