What is reheating in Rankine Cycle?
Reheating is a method of improving Rankine cycle efficiency which consists of inter-stage heating of the expanding steam. After the first stage of expansion which typically reduces initial steam pressure by one-fourth, the steam is heated up (or close) to the maximum heat source temperature.
What is regeneration in Rankine Cycle?
Regeneration increases the cycle heat input temperature by eliminating the addition of heat from the boiler/fuel source at the relatively low feedwater temperatures that would exist without regenerative feedwater heating.
What is regeneration in steam turbine?
One of the more common ways to improve the efficiency of a steam cycle is to use regeneration, a process where heat is taken from steam between turbine stages and used to heat water as it goes through pump stages.
What is ideal regenerative cycle?
The general idea is to increase the fluid average temperature during heat addition and decrease the fluid temperature during heat rejection. This section will introduce one such cycle – the ideal regenerative Rankine cycle, which increases the fluid average temperature during the heat addition process.
Where is the application of Rankine Cycle?
The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler, converting water into steam which then expands through a turbine producing useful work.
What is the most efficient thermodynamic cycle?
The most efficient heat engine cycle is the Carnot cycle, consisting of two isothermal processes and two adiabatic processes. The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws.
Where is Brayton cycle used?
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 are the two main applications of the Brayton cycle?
Probably the best known application of the Brayton cycle is the jet engine. The jet engine is widely used in aviation because they are relatively lightweight and are capable of huge power output. The basic jet engine relies on the high pressure and temperature turbine exhaust to provide thrust.
What is ideal Brayton cycle?
Ideal Brayton cycle: isentropic process – ambient air is drawn into the compressor, where it is pressurized. isobaric process – the compressed air then runs through a combustion chamber, where fuel is burned, heating that air—a constant-pressure process, since the chamber is open to flow in and out.
Which cycle is used in gas turbine explain?
The Brayton cycle is a thermodynamic cycle named after George Brayton that describes the workings of a constant-pressure heat engine. The original Brayton engines used a piston compressor and piston expander, but more modern gas turbine engines and airbreathing jet engines also follow the Brayton cycle.
What are the four processes of gas turbine principles?
In an ideal gas turbine, gases undergo four thermodynamic processes: an isentropic compression, an isobaric (constant pressure) combustion, an isentropic expansion and heat rejection.
What are the 3 main components of gas turbine?
The gas turbine has three major sections, namely the compressor, combustor and turbine (although, from a materials perspective, the other major component groups – rotor, casing and auxiliaries – are also of interest). The compressor, combustor and turbine sections are highlighted in Fig. 1.1.
What are the 4 types of gas turbine?
Four types of gas turbine engines are used to propel and power aircraft. They are the turbojet, turbofan, turboprop, and turboshaft.
What is the principle of gas turbine?
The gas-turbine operates on the principle of the Brayton cycle, where compressed air is mixed with fuel, and burned under constant pressure conditions. The resulting hot gas is allowed to expand through a turbine to perform work.
What are the components of a helicopter gas turbine engines?
The gas turbine engine mounted on most helicopters is made up of a compressor, combustion chamber, turbine, and accessory gearbox assembly.
What are the 2 common types of engine used in helicopters?
The two most common types of engines used in helicopters are the reciprocating engine and the turbine engine. Reciprocating engines, also called piston engines, are generally used in smaller helicopters. Most training helicopters use reciprocating engines because they are relatively simple and inexpensive to operate.
What are the main parts of a helicopter?
The major components of a helicopter are the cabin, airframe, landing gear, powerplant, transmission, mainrotor system, and tail rotor system.
What does the regenerative system on a gas turbine do?
Regeneration in thermodynamics process refers to a method where the certain quantity of heat abstracted from the steam is utilized to heat the water. The regeneration process occurs between the stages of turbine and pump respectively.