What is function of nozzle in steam turbine?

What is function of nozzle in steam turbine?

1) The main function of the steam nozzle is to convert heat energy to kinetic energy. 2) To direct the steam at high velocity into blades of turbine at required angle. 1) Steam & gas turbines are used to produces a high velocity jet. It is a nozzle with large entrance and tapers gradually to a smallest section at exit.

What is the function of an impulse turbine?

Impulse turbines change the direction of flow of a high velocity fluid or gas jet. The resulting impulse spins the turbine and leaves the fluid flow with diminished 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.

What is nozzle in turbine?

The nozzle serves to convert any energy remaining in the flow (after the turbine) to kinetic energy by. decreasing pressure and accelerating the flow. This results in thrust.

What are the three primary functions of a nozzle?

Although requirements may differ from application to application, the basic functions of a nozzle are to: (1) Meter the liquid. (2) Atomize or break up the liquid into droplets. (3) Disperse these droplets as a specific pattern.

Why we use bypass nozzle in impulse turbine?

Some additional nozzles, known as Bypass Nozzles are provided. This way we avoid the bursting of pipe in case of sudden closing of water supply. Bypass nozzle doesn’t allow water to strike the buckets. In some Pelton Wheel Engineering defectors are provided in a nozzle, which is used to deflect the water jet.

Which of the following is the function of nozzle in a gas turbine engine?

All gas turbine engines have a nozzle to produce thrust, to conduct the exhaust gases back to the free stream, and to set the mass flow rate through the engine. The nozzle sits downstream of the power turbine.

What is the purpose of nozzle diaphragm?

The ring of stationary vanes directly ahead of the turbine wheel. The vanes in the nozzle diaphragm act as a series of converging ducts that accelerates the airflow as it leaves the combustors and directs the flow of hot gases into the turbine in the direction of maximum efficiency.

Where is the turbine nozzle?

The nozzle sits downstream of the power turbine and, while the nozzle does no work on the flow, there are some important design features of the nozzle. The static pressure at the exit of the nozzle is equal to free stream static pressure, unless the exiting flow is expanded to supersonic conditions.

How does an impulse turbine work?

The impulse turbine has multiple static nozzles that convert the pressure of the water jet into kinetic energy. After passing through the nozzle, the water strikes the blades of the impeller. The turbine impeller blades get almost all of the kinetic energy of the water jet and convert it into water speed.

What is the function of a jet nozzle?

A jet nozzle or a series of nozzles directs the high-speed flow to the blades, which are usually in the shape of buckets or cups. Therefore, only pressure changes occur in the nozzles. The application of the curved blades is to change the velocity of the flow.

What is the working principle of steam turbine?

In impulse turbines, the steam expands through the nozzle, where most of the pressure potential energy is converted to kinetic energy. The high-velocity steam from fixed nozzles impacts the blades, changes its direction, which in turn applies a force.

How does a jet turbine work?

The runner spins in the air, and the fluid is sprayed to the blades through the nozzle to exchange energy with the turbine. A jet nozzle or a series of nozzles directs the high-speed flow to the blades, which are usually in the shape of buckets or cups. Therefore, only pressure changes occur in the nozzles.