The working substance is compressed by the compressor.vi. Cheaper fuel such as paraffin can be used.xi.
They are not suitable for aircrafts due to high specific weight.v.
The thermal efficiency, however, can be improved with certain modifications in the gas turbine cycle plant. Such a high speed is not possible in IC engines.Thus, the thermal efficiency is independent of temperature and depends on pressure only. (c) Gas turbine cannot be operated reversibly.vii. Despite being classified as a gas turbine, the fuel source for the aeroderivative turbine is not really gas. The lubrication system is much simpler.viii. Definition of Gas Turbine 2.
The gas turbine is an internal combustion engine that uses air as the working fluid.
The exhaust gases from the turbine are expanded in the exhaust cone or nozzle to obtain a very high kinetic energy, the resulting reaction force propelling the aircraft.The mechanical efficiency of IC engines is low in the range of 80-85% as IC engines have many reciprocating parts. The aeroderivative gas turbine is a lighter weight variation of a gas turbine. Razak, in Industrial Gas Turbines, 2007. A.M.Y.
It has replaced cylinder piston type reciprocating internal combustion. In IC engines pressure developed is more, about 60 bar. (f) The manufacturing of blade profile is difficult and costly due to high temperature produced. It has replaced cylinder piston type reciprocating internal combustion.
All materials lose strength at very high temperatures, however, and since turbine blades travel at high speeds and are subject to severe centrifugal stresses, turbine-inlet temperatures above 1,100° C require special blade cooling.
They are much suitable for use in aircrafts due to low specific weight.iv.
The compressor shaft and turbine shaft are coupled for the transfer of power. Gas turbine is a simple way of power-producing system. In almost all the fields, open cycle gas turbine plants are used.Process 4-1: Constant pressure heat rejectionA gas turbine consists of a combustion chamber in which liquid fuel is burnt along with compressed air. The flow of gas takes place through the blade passage where kinetic energy is absorbed.ix. Our three-volume, first edition book is now available online through your Britannica Premium membership.\r\n
(d) It is difficult to start a gas turbine as compared to IC engine.Both compressor and turbine are mounted on a single shaft.
(c) The supply of fuel control is difficult due to high running speed.
The thermal efficiency of such unit has been found quite low in the range of 20-30%.
The overall weight of gas turbine per unit power produced is less.In this article we will discuss about:- 1.
It consists of a compressor, heater, gas turbine, and a cooler.
There is no variation in the specific heat of working substance.Gas turbine now-a-days has become the most important way of electrical power generation with compact unit.