Table of Contents
How does a turboshaft engine work?
A turboshaft engine is a variant of a jet engine that has been optimised to produce shaft power to drive machinery instead of producing thrust. The power turbine extracts almost all of the energy from the exhaust stream and transmits it via the output shaft to the machinery it is intended to drive.
What is the purpose of the diffuser section in a turbine engine?
Diffuser is one key component of the gas turbine combustor following the compressor. Its primary function is to slow down the air flow delivered by the compressor in order to promote efficient combustion and avoid large total pressure losses.
How do you make a gas turbine sea water system?
2 Encrustation and breaking off in solid particles under continuing lower humidities. Corrosion of gas-turbine parts outside of the high-temperature or “hot” section, is termed “cold” for contrast. The first effects were felt in the early 1950’s.
What makes a jet engine more powerful?
A jet engine is meticulously designed to hoover up huge amounts of air and burn it with vast amounts of fuel (roughly in the ratio 50 parts air to one part fuel), so the main reason why it makes more power is because it can burn more fuel.
Where are turboshaft engine used?
Turboshaft engines are commonly used in applications that require a sustained high power output, high reliability, small size, and light weight. These include helicopters, auxiliary power units, boats and ships, tanks, hovercraft, and stationary equipment.
Why do helicopters use turboshaft engines?
Helicopters use turboshaft gas turbine engines once helicopters begin to have over 4 seats. The lightweight, small, gas turbine engines produce more power for their size compared to piston engines and therefore helicopters are able to lift more. This equates to more passengers, cargo & fuel.
What is a section diffuser?
The diffuser is the divergent section of the engine after the compressor and before the combustion section. It has the all-important function of reducing high-velocity compressor discharge air to increased pressure at a slower velocity.
How much power does a gas turbine produce?
100 to 400 megawatts
In areas with a shortage of base-load and load following power plant capacity or with low fuel costs, a gas turbine powerplant may regularly operate most hours of the day. A large single-cycle gas turbine typically produces 100 to 400 megawatts of electric power and has 35–40\% thermodynamic efficiency.
What are the advantages and disadvantages of gas turbines?
Power Generation/Gas Turbine Power
| Advantages | Disadvantages |
|---|---|
| Less water used since there is no need for a condenser | Temperature of combustion chamber is too high thus resulting in a lower life. |
| Maintenance charges are low | . |
| Can be started quickly | . |
| No stand-by losses | . |
How much horsepower does a 777 engine have?
In a Boeing 777, a single engine produces 52,000 hp.
How much HP is a jet engine?
1 Megawatt equals 1341 horsepower. For an aircraft like a Boeing 777 with two GE 90-115B engines each engine produces roughly 23 Megawatt of power during cruise flight with a fully loaded aircraft. This is 30.843 horsepower.
What is the difference between a turbojet and a turbofan engine?
While a turbojet engine uses the entire gas generator’s output to produce thrust in the form of a high-velocity exhaust gas jet, cool, low-velocity bypass air produces between 30 percent and 70 percent of the thrust produced by a turbofan engine.
What is a turboshaft engine used for?
Turboshaft engines are used in many helicopters, as well as tanks, boats, and even race cars in the late 1960’s. The thrust equation for a turboprop is given on a separate slide. Navigation ..
What does the afterburner do in a turbojet engine?
The afterburner increases the temperature of the gas ahead of the nozzle. The result of this increase in temperature is an increase of about 40 percent in thrust at takeoff and a much larger percentage at high speeds once the plane is in the air. The turbojet engine is a reaction engine.
What is the difference between high speed transport and turboprop?
High speed transports usually use high bypass turbofans because of the high fuel efficiency and high speed capability of turbofans. A variation of the turboprop engine is the turboshaft engine. In a turboshaft engine, the gear box is not connected to a propeller but to some other drive device.