Table of Contents
- 1 What is function of nozzle in gas turbine?
- 2 What is the main purpose of the turbine nozzle in an aircraft turbine engine?
- 3 Why is a variable exhaust nozzle required in an engine equipped with an afterburner?
- 4 What factors affect thrust?
- 5 How does a gas turbine work like a jet engine?
- 6 How does a nozzle affect the direction of thrust?
What is function of nozzle in gas turbine?
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. A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow.
What is the main purpose of the turbine nozzle in an aircraft turbine engine?
Why does the exhaust nozzle expand or contract in jet engines equipped with afterburners?
The nozzle area is increased during afterburner operation to limit the upstream effects on the engine. To run a turbofan to give maximum airflow (thrust), the nozzle area may be controlled to keep the fan operating line in its optimum position.
What is the purpose of the turbine nozzle assembly in the turbine section?
Each turbine section contains a stationary nozzle that directs the compressed combustion gas into the buckets. The force of the gas stream emitted from the nozzles pushes against the turbine buckets and turbine blades, causing the entire rotor to spin. This setup creates high pressure and heat flow.
Why is a variable exhaust nozzle required in an engine equipped with an afterburner?
Since the temperature of an afterburner can reach 1700 deg. An afterburning jet pipe is larger than a normal jet pipe would be so as to obtain a reduced velocity gas stream. Therefore, an afterburning jet pipe is equipped with either a two-position or a variable nozzle to provide for operation under all conditions.
What factors affect thrust?
The factors affecting thrust of a gas turbine engine include air density, altitude, airspeed, ram effect and engine RPM. The effect of these factors is not restricted to any particular gas turbine engine; although a certain engine may be able to compensate for an effect better than another.
What is the function of a nozzle in a gas turbine?
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. A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow.
What type of nozzle is used in a turbojet?
Simple turbojets, and turboprops, often have a fixed geometry convergent nozzle as shown on the left of the figure. Turbofan engines often employ a co-annular nozzle as shown at the top left. The core flow exits the center nozzle while the fan flow exits the annular nozzle.
How does a gas turbine work like a jet engine?
The turbine works like a windmill. Instead of needing energy to turn the blades to make the air flow, the turbine extracts energy from a flow of gas by making the blades spin in the flow. In a jet engine we use the energy extracted by the turbine to turn the compressor by linking the compressor and the turbine by the central shaft.
How does a nozzle affect the direction of thrust?
Changing the direction of the thrust with the nozzle makes the aircraft much more maneuverable. Because the nozzle conducts the hot exhaust back to the free stream, there can be serious interactions between the engine exhaust flow and the airflow around the aircraft.