What is the pressure velocity compounding?
Impulse stages may be either pressure-compounded, velocity-compounded, or pressure-velocity compounded. Pressure-velocity compounding is a combination of the above two types of compounding. It then passes over the 3-4 rings of moving blades (with fixed blades between them), where nearly all of its velocity is absorbed.
Why compounding is done in steam turbine explain pressure velocity compounding in impulse turbine?
Compounding is done to reduce the rotational speed of the impulse turbine to practical limits. Compounding is achieved by using more than one set of nozzles, blades, rotors, in a series, keyed to a common shaft; so that either the steam pressure or the jet velocity is absorbed by the turbine in stages.
What is the difference between pressure compounding and velocity compounding?
Difference between velocity compounding and pressure compounding are: Pressure of the steam remains constant in every fixed blade and moving blades except in the first nozzle in velocity compounding whereas in pressure compounding turbine pressure of steam increase in every nozzle.
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 meant by pressure compounding in a 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.
What do you mean by compounding of steam turbine discuss various methods of compounding steam turbines?
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 and disadvantages of pressure compounding?
Advantages and disadvantages of pressure compounding The velocity of steam is lower than that of velocity compound turbine. Most efficient turbine because the ratio of blade velocity to steam velocity is constant.
What are the types of compounding of steam turbine?
Generally, three different types of compounding are used to reduce the rotor speed of steam turbine.
- Velocity Compounding.
- Pressure Compounding.
- Pressure Velocity Compounding.
- Advantages velocity compounded steam turbine:
- Disdvantages velocity compounded steam turbine:
What is compounding of turbines and state the types of compounding?
Types of compounding of turbine. Velocity compounding and pressure compounding. Velocity compounding: Kinetic energy (velocity) of Working fluid (steam) is extracted, and convert it to useful work in multiple stages. The pressure drop (steam expand) occurs at first nozzle only.
What is the benefit of compounding?
Compound interest makes your money grow faster because interest is calculated on the accumulated interest over time as well as on your original principal. Compounding can create a snowball effect, as the original investments plus the income earned from those investments grow together.
What is the need for compounding in steam turbines?
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.
What do you mean by compounding of steam turbines discuss various methods of compounding steam turbines?
What is pressure velocity compound turbine?
The pressure-velocity compounding is a combination of the above two types of compounding. In fact, a series of velocity-compounded impulse stages is called a pressure-velocity compounded turbine. Each stage consists of rings of fixed and moving blades.
Which method of pressure-velocity compounding is used in Curtis turbine?
The method of pressure-velocity compounding is used in the Curtis turbine. Compounding of steam turbines is the method in which energy from the steam is extracted in a number of stages rather than a single stage in a turbine. In all turbines, the rotating blade velocity is proportional to the steam velocity passing over the blade.
How is compounding achieved in a steam turbine?
In an impulse steam turbine compounding can be achieved in the following three ways: A velocity-compounded impulse stage consist of a row of fixed nozzles followed by two or more rows of moving blades and fixed blades (without expansion). This divides the velocity drop across the stage into several smaller drops.
How to reduce rotor speed of steam turbine?
Generally, three different types of compounding are used to reduce the rotor speed of steam turbine. 1. Velocity Compounding 2. Pressure Compounding 3. Pressure Velocity Compounding 1. Velocity Compounding:- In velocity compounding turbine, some moving blades, fixed blades and a set of nozzle are shown in figure.