Although the components have individual purposes, they also have one common function: they must direct the flow of hot gases rearward in such a manner as to prevent turbulence and, at the same time, impart a high final or exit velocity to the gases.
What is exhaust in turbine engine?
Exhaust or nozzle — Turbine exhaust gases pass through the propelling nozzle to produce a high velocity jet. The nozzle is usually convergent with a fixed flow area. Supersonic nozzle — For high nozzle pressure ratios (Nozzle Entry Pressure/Ambient Pressure) a convergent-divergent (de Laval) nozzle is used.
What is the function of the exhaust section?
An exhaust system carries waste gases and other combustion products away from an automobile engine. It allows the vehicle to operate with minimal noise, smoke and pollution transmitted to the environment.
What are the three components of a turbine engine exhaust system?
The components of the exhaust section include the exhaust cone, tailpipe (if required), and the exhaust nozzle. The exhaust cone collects the exhaust gases discharged from the turbine section and gradually converts them into a solid flow of gases.
What is the main function of the engine exhaust nozzle?
This chapter describes the exhaust nozzle and its application to aircraft gas turbine engines. The nozzle’s two primary functions are to generate thrust and to act as a control valve for the engine.
Where is the highest pressure in a turbine engine?
Pressure is highest either at the end of the compressor, or right before the power turbine section. Temperature is going to be the highest in the combustion section.
Why do turbine casings need to be cooled?
The large surplus of air cools the hot sections of the engine to acceptable temperatures ranging from 1,500° to 2,100 °F. … Because of the effect of cooling, the temperatures of the outside of the case are considerably less than those encountered within the engine.
What is a Catback exhaust system?
A cat-back exhaust system is a modification in the exhaust pipe to improve airflow. The system runs from the tip of the exhaust to the catalytic part of the system. The cat-back system comprises a pipe connecting the muffler to the catalytic converter, and the exhaust tip.
Why do we need an exhaust system?
Removes harmful emissions
In an internal combustion engine fossil fuels are burned and create harmful gases such as carbon monoxide, nitrogen oxide and nitrogen monoxide. The car exhaust is responsible for removing these emissions safely out of the vehicle and the environment.
What is a full exhaust system?
An exhaust system is used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. … A turbocharger to increase engine power. A catalytic converter to reduce air pollution.
Is a jet engine a combustion engine?
Jet engine, any of a class of internal-combustion engines that propel aircraft by means of the rearward discharge of a jet of fluid, usually hot exhaust gases generated by burning fuel with air drawn in from the atmosphere.
What are the major components of a turbine engine?
Major components include the compressor, combustion system, gas producer turbine, and power turbine. This design includes a two-stage gas producer turbine and a two-stage power turbine.
How does a turbojet engine work?
A turbojet engine is a gas turbine engine that works by compressing air with an inlet and a compressor (axial, centrifugal, or both), mixing fuel with the compressed air, burning the mixture in the combustor, and then passing the hot, high pressure air through a turbine and a nozzle.
What is an exhaust nozzle?
: the terminal portion of the tail pipe of a jet engine.
How does a nozzle decrease pressure?
The pressure drops in a convergent nozzle because of the Bernoulli Principle. A nozzle is a spout on the end of a hose or pipe used to control the movement of a fluid like water or air. … The energy in this random motion is converted into faster forward motion, known as stream flow. This change makes the pressure drop.
What is divergent nozzle?
A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube that is pinched in the middle, making a carefully balanced, asymmetric hourglass shape. … Because of this, the nozzle is widely used in some types of steam turbines and rocket engine nozzles.