What is velocity compounding and pressure compounding?

Velocity & pressure compounding are done to maximise the performance of turbine. With the help of fixed and moving blades velocity compounding is done. Whereas in pressure compounding nozzles are used in place of fixed blades.

What is pressure and velocity compounding of steam turbine?

Steam expands from boiler pressure to the condenser in one stage. So, steam’s pressure drop and it will increase its velocity. This high-velocity strikes the turbines rotor and the speed of the rotor becomes high. Compounding of steam turbine is used to reduce the rotor speed.

What is velocity compounded turbine?

In turbine: Turbine staging. In velocity-compound staging a set of stationary nozzles is followed by two sets of moving blades with a stationary row of impulse blades between them to redirect the flow. Ideally this allows twice as much power to be extracted than from a single impulse stage for…

What is meant by pressure compounding in turbine?

Pressure compounding is the method in which pressure in a steam turbine is made to drop in a number of stages rather than in a single nozzle. This method of compounding is used in Rateau and Zoelly turbines.

Why is compounding necessary in turbine?

Compounding of steam turbine is used to reduce the rotor speed. It is the process by which rotor speed come to its desired value. Moreover, at such high speeds the centrifugal forces are immense, which can damage the structure. Hence, compounding is needed.

Why is compounding of steam turbines done Mcq?

Compounding of steam turbines are done, where rotor speed (flow speed) is reduced in steps, this prevent over speeding of turbine, which could lead to mechanical failures of turbine blades.

What is compounding of steam turbine & discuss types of compounding?

Compounding of steam turbines is the strategies in which energy from the steam is extracted in a number of stages rather than a single stage in a turbine.

What are the advantages of pressure velocity compounding?

Reliable and simple to operate. The leakage of steam is very less because of the low-pressure operation. The requirement of space and the initial cost is less due to lesser stages. No need to keep stronger blades because it works in lower pressure that reduces the stress.

What is the advantage of pressure and velocity compound?

All rotors are mounted on the same shaft. Pressure velocity compounding gives the advantage of producing a shortened rotor compared to pure velocity compounding. In this design steam velocity at exit to the nozzles is kept reasonable and thus the blade speed (hence rotor rpm) reduced.

What is compounding and explain the purpose of compounding?

Compounding is the process in which an asset’s earnings, from either capital gains or interest, are reinvested to generate additional earnings over time.

What is the purpose of compounding?

What is compounding? Drug compounding is often regarded as the process of combining, mixing, or altering ingredients to create a medication tailored to the needs of an individual patient. Compounding includes the combining of two or more drugs.

Why compounding of turbine is done?

Compounding of steam turbine is used to reduce the rotor speed. It is the process by which rotor speed come to its desired value. A multiple system of rotors are connected in series keyed to a common shaft and the steam pressure or velocity is absorbed in stages as it flows over the blades.