Nozzle. The nozzles are used to increase the kinetic energy of the water and to spray water to the blades of the turbine. This nozzle forms a jet with high velocity. This indicates the flow of water towards the blade in a particular direction. In an impulse turbine, single or multiple nozzles may be used.
What is the function of nozzle in impulse turbine?
Nozzle. The nozzle is installed to adjust and jet the fluid flow to strike the buckets. As mentioned earlier, it is the only part of the impulse turbine assembly that the pressure changes and the flow head are converted into kinetic energy.
Which type of nozzle is used in impulse steam turbine?
Velocity compounding of an impulse turbine is the use of a single nozzle with an arrangement of several moving blades on a single disc. Between the moving blades are fitted guide blades which are connected to the turbine casing.
How many set of nozzles are there in a simple impulse turbine?
one set of nozzles
Explanation: There is only one set of nozzles in a simple impulse turbine. The complete expansion of steam takes place at once. The pressure of the steam doesn’t alter when the steam moves over the blades of the turbine.
What is nozzle function?
The primary function of a nozzle is to control flow rate and convert the spray liquid into droplets (via atomisation) that are of a suitable size for depositing on the intended target.
What is the function of nozzle *?
The essential operating data of spray nozzles is flow rate, spray angle, liquid distribution, spray impact and droplet size.
What is nozzle in steam turbine?
A steam nozzle is a duct or passage of smoothly varying cross sectional area which converts heat energy of steam into kinetic energy. The shape of the nozzle is designed such that it will perform this conversion of energy with minimum loss.
What is nozzle Mcq?
Explanation: Nozzles are used to control the rate, speed, direction of flow.
What is enthalpy drop?
Thus low enthalpy drop means high mass flow and high volumetric flow, which makes the turbine design stage easier (larger relative blade height).
Where is nozzle used?
A nozzle is often a pipe or tube of varying cross sectional area, and it can be used to direct or modify the flow of a fluid (liquid or gas). Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them.
What is the function of nozzle in steam turbine?
The Nozzle converts the pressure energy of the steam into kinetic energy. The total enthalpy drop and hence the pressure drop occurs in the nozzle. Hence, the pressure thereafter remains constant. This high velocity steam is directed on to the first set (ring) of moving blades.
What is the difference between impulse and reaction turbine?
Impulse turbines are most efficient for use in cases where the flow is low and the inlet pressure is high. Reaction turbines develop torque by reacting to the gas or fluid’s pressure or mass. The pressure of the gas or fluid changes as it passes through the turbine rotor blades.
What is multi-stage expansion in impulse turbines?
One of the methods to employ multi-stage expansion in impulse turbines is to generate high-velocity of the fluid by causing it to expand through a large pressure drop in the nozzle blade row. This high-velocity fluid then transfers its energy in a number of stages by employing many rotor blade rows separated by rows of fixed guide blades.
What is velocity compounding of impulse turbine?
Velocity compounding of Impulse Turbine. The velocity compounded Impulse turbine was first proposed by C G Curtis to solve the problem of single stage Impulse turbine for use of high pressure and temperature steam. The rings of moving blades are separated by rings of fixed blades.
