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Can turbine be used as compressor?
As the name suggests, gas turbine engine compressors provide the compression part of the gas turbine engine thermodynamic cycle. There are three basic categories of gas turbine engine compressor: axial compressor, centrifugal compressor and mixed flow compressor.
Why can a single turbine stage drive many stages of compressor?
A single turbine stage can be used to drive multiple compressor stages. Because of the high pressure change across the turbine, the flow tends to leak around the tips of the blades. Turbine blades must be made of special materials that can withstand the heat, or they must be actively cooled.
Why it is all turbine engines have a compressor?
All turbine engines have a compressor to increase the pressure of the incoming air before it enters the combustor. Compressor performance has a large influence on total engine performance. A similar average, single-stage axial compressor increases the pressure by only a factor of 1.2.
Where is the point of highest velocity in a gas turbine engine?
The divergent duct shape converts most of the air’s velocity (Pi) into static pressure (PS). As a result, the highest static pressure and lowest velocity in the entire engine is at the point of diffuser discharge and combustor inlet.
What is the difference between compressor and turbine?
Turbine extract energy by decreasing the pressure, while compressor increase fluid pressure. 3. This because turbines deliver works by decreasing total pressure to certain static pressure, without its dynamic velocity. While compressor requires energy to achieved total pressure at the outlet.
What is the function of turbine?
Briefly, the purpose of a turbine is to convert the available energy into the fluid that enters it to generate electrical energy. In its conception, the turbine expands the fluid that enters it, decreasing its pressure – or even, decreasing its internal energy2.
What are the stages of a turbine engine?
Turbojets work by passing air through 5 primary sections of the engine:
- Step 1: Air Intake. The air intake is essentially a tube in front of the engine.
- Step 2: Compressor.
- Step 3: Combustion Chamber.
- Step 4: Turbine.
- Step 5: Exhaust (aka “I’m outta here!”)
Why compressor has more stages than turbine?
Very simply, a turbine has fewer stages than the compressor, because the flow in the turbine is going in the direction of reducing pressure – the air wants to go that way naturally. But a compressor has to make the air flow in the direction of increasing pressure.
Where the gas turbines are used?
Gas turbines are used to power aircraft, trains, ships, electrical generators, pumps, gas compressors, and tanks.
Is turbine a constant pressure?
CONSTANT PRESSURE GAS TURBINE Filed July 16, 1940 Patented Mar. The high air content of the driving gases of constant pressure gas turbine is due to the fact that these turbines operate with cooling air in order that the high combustion temperature, for instance 1800 C., can be reduced to a temperature of about 500 C.
Can a HP turbine rotate at the same speed as a LP compressor?
HP turbine and HP compressor will rotate at the same speed, but this is not necessarily equal (in fact is highly likely that it will be different, otherwise there would not be the need for different shafts) to the speed of the IP compressor/turbine couple. And this will be different also from the speed of the LP turbine/fan couple.
How does a compressor work in a jet turbine?
The compressor is made with many blades attached to a shaft. The blades spin at high speed and compress or squeeze the air. The compressed air is then sprayed with fuel and an electric spark lights the mixture. The burning gases expand and blast out through the nozzle, at the back of the engine.
How are the shafts of a turbine different?
The different shaft will rotate at different speed from each other, but the relative compressor/turbine pairs will rotate at the same speed. Expanding a little, in the most complex case that I heard of, there are 3 shafts: High Pressure (HP), Intermediate-Pressure (IP) and Low Pressure (LP)
Why do you need a shaft for a compressor?
I understand the shaft is there so that the turbine helps the compressor move. But this introduces a serious constraint: both the compressor and the turbine need to rotate at the same speed. Is this true in general? How is this managed when there are several shafts connecting several compressors/turbines?