A heat exchanger (external combustion) is usually used in these turbines, and only a clean medium with no combustion products travels through the power turbine. The closed Brayton cycle is used, for example,
in closed-cycle gas turbines and high-temperature gas-cooled reactors
.
What is the difference between jet cycle and open Brayton?
Jet-propulsion cycle differs from the Brayton cycle in the gas expansion process. In Brayton cycle, gases are expanded to ambient conditions, but in jet-propulsion cycle, the gases are expanded to a pressure such that the power produced is only enough to drive the compressor and the auxiliary equipment.
What type of cycle is the Brayton cycle?
A The
Thermodynamic Cycle
. The basic thermodynamic cycle used in the gas turbine is the Brayton cycle. This cycle, illustrated by a pressure–temperature diagram in Fig. 1, was described originally by Joule in 1851 and patented by Brayton in 1867.
What is the difference between a Rankine cycle & a Brayton cycle?
The key difference between Rankine cycle and Brayton cycle is that
the Rankine cycle is a vapour cycle, whereas the Brayton cycle is a cycle between liquid and vapour phases
. Both the Rankine cycle and Brayton cycle are thermodynamic cycles.
What is the difference between the Otto cycle and Brayton cycle?
Brayton cycle uses a gas turbine and compressor whereas Otto cycle uses piston cylinder arrangement for its working
. Otto cycle is preferred for SI engines where one cannot fit a gas turbine and compressor in the vehicle.
What is open cycle?
An open cycle gas turbine is
a combustion turbine plant fired by liquid fuel to turn a generator
.
rotor that produces electricity
. The residual heat is exhausted to atmosphere at about 550 degrees. Celsius. The turbine and generators are housed in enclosures designed to reduce noise levels and.
Where reversed Brayton cycle is used?
Reversed Brayton cycle used in the air refrigeration cycle which uses air as the refrigerant. It is used for
air conditioning in aeroplanes
.
What is the Brayton cycle used for?
The Brayton cycle is a thermodynamic cycle used in some heat engines. Notably, it is used for
gas turbine engines and some jet engines
. The cycle consists of compressing ambient air, mixing the air with fuel, then igniting the mixture, which expands, doing work.
What is open 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. 3. The working fluid is circulated continuously. The working fluid is replaced continuously.
Why is a gas turbine considered to operate on the Brayton cycle?
The Brayton Cycle is a thermodynamic cycle that describes how gas turbines operate. The idea behind the Brayton Cycle is
to extract energy from flowing air and fuel to generate usuable work which can be used to power many vehicles by giving them thrust
.
Is Joule cycle and Brayton cycle same?
Explanation:
Gas turbines operate on Brayton cycle/Joule cycle
. The Joule cycle consists of four internally reversible processes: Isentropic compression (in a compressor)
Which cycle is more efficient?
Explanation:
Otto cycle
is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.
Which Brayton cycle is used in aircraft?
Turbine Engine Thermodynamic Cycle – Brayton Cycle. To move an airplane through the air, we have to use some kind of propulsion system to generate thrust. The most widely used form of propulsion system for modern aircraft is the
gas turbine engine
.
Why do jet engines have turbines?
As the jets of gas shoot backward, the engine and the aircraft are thrust forward. As the hot air is going to the nozzle, it passes through another group of blades called the turbine. The turbine is attached to the same shaft as the compressor.
Spinning the turbine causes the compressor to spin
.
Which is more efficient Rankine or Brayton?
The Brayton cycle is more efficient than the Rankine cycle
, but the Rankine cycle can generate more power because it uses water as its working fluid. The Brayton cycle is a thermodynamic cycle in which a gas or vapor is compressed, heated, and then expanded.
What is the difference between the Brayton cycle and Rankine cycle Mcq?
Explanation: The difference between a Rankine cycle & a Brayton cycle is that
the working fluid in a Brayton cycle doesn’t undergo phase change while it does in Rankine cycle
.
Which processes do occur in the Brayton cycle?
Brayton cycle is a theoretical cycle for gas turbines. This cycle consists of
two reversible adiabatic or isentropic processes and two constant pressure processes
. The heat addition and rejection takes place at constant pressure.
Which cycle is more efficient Otto or diesel?
Although for a given compression ratio the
Otto cycle
has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
Which is more efficient Brayton or Otto?
The
Brayton cycle is the ideal cycle for a gas-turbine engine and has the same efficiency as that of the Otto cycle
(Granet, p. 373).
Why Brayton cycle is more suitable then Otto cycle?
Answer: In gas turbine plant – it works on brayton cycle where the heat added & heat rejected at constant pressure. …
It is not possible in Oto cycle because the heat added & rejected at constant volume
so bray ton cycle is most suitable than Otto cycle for gas turbine plant.
Is gas turbine an open cycle?
An open cycle gas turbine can be defined as a combustion turbine plant that is fired up using liquid fuel for rotating a generator so that electricity can be produced
. The residual heat can be worn out to the environment at 550o Celsius.
What are the advantages of open cycle gas turbine?
Advantages Of Open Cycle Gas Turbine:
1)
It is low in cost
. 2) It is very lightweight. 3) Any type of gas can be used in this turbine. Helium or a combination of helium and carbon dioxide gives high efficiency.
What is an Ocgt?
In a simple cycle gas-turbine, also known as
open-cycle gas-turbine
(OCGT), hot gas drives a gas turbine to generate electricity. This type of plant is relatively cheap to build and can start very quickly, but due to its lower efficiency is at most is only run for a few hours a day as a peaking power plant.
Would it be practical to run a Brayton cycle in reverse and use it as a refrigerator explain briefly?
MP 3.. 10 Would it be practical to run a Brayton cycle in reverse and use it as refrigerator?
Yes
. In fact people in Cryogenics use reversed Brayton cycles to cool down systems where very low temperatures are required (e.g., space applications, liquefaction of propellants).
Why gas refrigeration is a reverse Brayton cycle?
A Brayton cycle that is driven in the reverse direction is known as the reverse Brayton cycle. Its purpose is
to move heat from the colder to the hotter body rather than produce work
. This cycle is also known as the gas refrigeration cycle or the Bell Coleman cycle.
What cycle is used for aircraft refrigeration?
Air cycle refrigeration works on the
reverse Brayton or Joule cycle
. Air is compressed and then heat removed, this air is then expanded to a lower temperature than before it was compressed.
