Stators, Combustors and Turbines - Turbine Engines: A Closer Look

[TR3B11]

Does the stators increase in terms of the chord towards the root (fixing point)?

[AgentJayZ]

@TR3B11 no usually. As you can see in this engine, the chord is constant. All other engines I've seen are similar.

[michiganstopcat]

The snowmobile hanging on the wall is a collectable and are very hard to find. To hell with the the gas turbine motors let talk sleds.

[AgentJayZ]

@michiganstopcat That is a real SSR and it has almost no hours on it. I do not believe it is negotiable...

[michiganstopcat]

@AgentJayZ Awesome to see that hanging on your wall!!!! Guys would be licking their chops at the thought of buying that!!! You video is also very good, Im a stationary engineer in a power plant and we have a gas turbine generator and its the easiest piece of equipment to start up as any we have.

[flaps20check]

If you know, i would like to ask you if whole air by compression comes into the combustion liner through the holes or there is a bypass for cooling reasons or whatever?

[LarryCanFly]

Very interesting! With 15k HP excess for external work + 30k HP extracted to drive compressor, then somewhere there must be 45k HP?

[AgentJayZ]

@LarryCanFly I guess if the combustor section could be supplied with enough air at the right pressure, then it could just rage away like a rocket, without a turbine in its exhaust. Then it could drive a power turbine making about 45 thousand Hp... but you can't get something for nothing. If there's no turbine extracting the power to drive the compressor, then the combustors don't get fed, and nothing happens.

[LarryCanFly]

@AgentJayZ No question that most the power produced is used to driver the compressor - which of course makes it all possible. The compressor+turbine lets you burn more fuel, faster, hotter, and at higher pressures than alternatives, which is good. And really good at high altitudes where the air is thin. So to have 15k HP extra, you put 30k into the compressor and get 45k out - continuously, a great return on investment. And to think you start with 10hp, some fuel, and a spark? Wow.

[AgentJayZ]

@LarryCanFly There is no free lunch: simply put - two thirds of the energy obtained from burning the fuel is used to compress the air to burn with the fuel. One third is left over to perform useful work.

[LarryCanFly]

@AgentJayZ Well said! Is there anything on the horizon that might extract more useful work from the fuel? Higher temps and  higher pressures have been the path, right? but how far can it go?

[TalksWithDirt]

So 30,000 HP, that's roughly 23 MW. Is that really 23 MW transmitting to drive the compressors? When these things drive a power pack what kind of electrical energy can be generated (in MW) with an LM 1500? I assume the 1500 indicates the level of power. What are gas turbines max thermo efficiency? 60% if so you're talking ! 50MEe (Mega Watts Electrical) or there abouts.

[AgentJayZ]

@TalksWithDirt ... please see my answer to scrfce about the same question.

roughly 2/3 of the total power created by the burning of all that fuel in a gas turbine engine is used up driving the compressor.

In service an LM1500 pushing thru a power turbine, turning a generator can make about 9 MW of electricity.

The engines rating is not what gets sent down the line, because the power turbine and electrical generator both have less than 100% efficiency.

[stingerfist]

Does the Turbine consist of stators to? and what do they do to the pressure and veloctiy in the turbine. Thanks. Gread vid by the way! 

[AgentJayZ]

@stingerfist The turbine has guide vanes for each stage that direct the gas stream at the best angle to the turbine. These guide vanes are known as nozzles.

The nozzles usually are designed to accelerate the gases as well as redirecting them to the best impingement angle. The turbine then decelerates the gases, extracting their energy.

It's more compicated than that, and I suggest you read "The Jet Engine", a great book by Rolls Royce.

[joeysways]

Were are you from AgentJayZ. Great job on the video man..

[995sunglasses]

Just wondering, looks like a lot of work goes into these engines. Nice video..

[AgentJayZ]

@995sunglasses Many hundreds of worker-hours are required to do repairs... more to bring an engine to new condition.

But worth the effort, since a replacement engine would cost millions of dollars.

[995sunglasses]

how much is one of those engines?

[AgentJayZ]

@995sunglasses Price depends on condition and warranty... but anywhere from a good car to a really nice house...

Give us a call!

250 785 5272

[scrfce123]

Great vid... Isn't 30,000 SHP just a little wishful for an LM1500? About 12-15 MW or 15,000-19,500 SHP seems more accurate. Still nothing to sneeze at...

[AgentJayZ]

@scrfce123 Ah! You've hit on a characteristic of gas turbine engines.

About two thirds of the power generated by the turbine is used up in turning the compressor.

The remainder is what goes out the back as useful, net power available to do external work.

A turbine engine rated at 15,000 hp is using twice that amount just to compress the air entering it.

It would take a 30,000 hp device to turn the compressor of an LM1500 at its rated speed.

[GenXCypher]

Thankyou for another great vid! these are really useful for anyone studying Jet engines.

You would be a fantastic person to learn from in person!