3
Brayton (or Joule) Cycle
. Essentially all gas turbines are based on the Brayton cycle, which is sometimes referred to as a Joule cycle. In this cycle, fuel and air are pressurized, burned, pass through a gas turbine, and exhausted. The exhaust gases are generally used to preheat the fuel or air.
What is a gas turbine cycle?
There are essentially three types of gas turbine cycles: first is
the simple cycle, where the gas is exhausted directly to atmosphere
; secondly, the regenerative cycle, where the exhaust gas is used in an exchanger (regenerator) to preheat the compressor discharge air prior to the combustor; and finally there is the …
Which cycle is a standard cycle for a gas turbine?
The Joule cycle
is the air-standard cycle which describes the processes in the gas turbine. The Joule cycle has constant pressure combustion and constant pressure heat rejection.
Are closed cycle gas turbine works on?
The closed cycle gas turbine works
on the basis of the Brayton cycle or Joule’s cycle
. Gas is compressed isentropically in this type of gas turbine by a compressor, which then flows into a heating chamber.
Where is open cycle gas turbine used?
Applications of Open Cycle Gas Turbine:
Some industrial processes. Industries.
Propulsion of marine, automotive, and locomotives
. They are used in the application of mechanical drives.
How does a gas turbine work?
As hot combustion gas expands through the turbine, it spins the rotating blades. The rotating blades perform a dual function: they drive the compressor to draw more pressurized air into the combustion section, and they spin a generator to produce electricity.
What is gas turbine system?
A gas turbine is
a combustion engine at the heart of a power plant that can convert natural gas or other liquid fuels to mechanical energy
. This energy then drives a generator that produces the electrical energy that moves along power lines to homes and businesses.
How does a jet turbine work?
How many stages are there in a gas turbine?
The turbine is normally based on the reaction principle with the hot gases expanding through
up to eight stages
using one- or two-spooled turbines.
Which cycle is air standard cycle for gas turbine Mcq?
What is the air standard cycle for a Gas-Turbine called? Explanation:
Brayton cycle
is an ideal air standard cycle for a Gas turbine, which, like the Rankine cycle, also comprises of two reversible adiabatic & two reversible isobars.
What is Otto and Diesel cycle?
Otto cycle is used for petrol or spark ignition engine while diesel cycle is used for diesel or compression ignition engine
. The main difference between Otto cycle and Diesel cycle is that in Otto cycle heat addition takes place at constant volume and in diesel cycle heat addition takes places at constant pressure.
Why is Otto cycle more efficient?
The simple answer is ,
In the otto the energy available is fully used to raise the pressure in the cylinder
. Higher the pressure implies larger work done. But in diesel cycle, Part of the energy is added only during the expansion, So it does not contribute to the work. Hence Otto cycle is more efficient.
What is open cycle gas turbine and closed cycle gas turbine?
In closed cycle gas turbine, the gas that comes out from the gas turbine passes into the cooling chamber. In an open cycle, the gases coming out from the gas turbine is exhausted in the atmosphere. The working fluid is circulated continuously. The working fluid is replaced continuously.
What is close cycle?
a heat engine in which the working substance is continuously circulated and does not need replenishment
.
What is closed cycle approach?
Explanation: Anderson cycle is also called as closed cycle. Closed cycle
utilizes the oceans warm surface and cool deep waters heat source and sink respectively, but requires a separate working fluid that receives and rejects heat to the source and sink via heat exchanges
. 9. Who proposed closed cycle approach?
Where is turbine used?
Turbines are used
in wind power, hydropower, in heat engines, and for propulsion
. Turbines are extremely important because of the fact that nearly all electricity is produced by turning mechanical energy from a turbine into electrical energy via a generator.
What is meant by open cycle?
[¦ō·pən ¦sī·kəl] (thermodynamics)
A thermodynamic cycle in which new mass enters the boundaries of the system and spent exhaust leaves it
; the automotive engine and the gas turbine illustrate this process.
What is a gas turbine generator?
How does a combined cycle gas turbine work?
A combined-cycle power system typically
uses a gas turbine to drive an electrical generator, and recovers waste heat from the turbine exhaust to generate steam
. The steam from waste heat is run through a steam turbine to provide supplemental electricity.
How does a gas turbine locomotive work?
A GTEL
uses a turbo-electric drivetrain in which a turboshaft engine drives the electric generator or alternator via a system of gears
. The electric current is distributed to power the traction motors that drive the locomotive.
How do turbines work?
In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.
Which fuel is used in gas turbine?
While gas turbines are often advertised as having fuel flexibility, about 90 percent of gas turbines worldwide operate on
natural gas or liquefied natural gas (LNG)
because of its purity and ease of combustion. Only about 400 GE gas turbines globally operate on crude, naphtha or heavy fuel oils.
Which gas is used in gas turbine power plant?
Natural gas
is the most preferred conventional fuel for propulsion of gas turbines. In view of this, it is often used as a reference fuel for comparison of the performance of gas turbine engines.
What power cycle is used in jet engines?
3 Gas Turbines and Jet Engines. The
modified Brayton cycle
is used for both gas turbines and jet engines. The turbine is designed to produce a usable torque at the output shaft, while the jet engine allows most of the hot gases to expand into the atmosphere, producing usable thrust.
How a jet engine works step by step?
How do propellers work?
The propeller works by
displacing the air pulling it behind itself (the action), this movement of air then results in the aircraft being pushed forward from the resulting pressure difference (the opposite reaction)
. The more air that is pulled behind the propeller the more thrust or forward propulsion is generated.
