Correction: The Thermal Efficiency of Gas Turbine Engines is between 30% to 40% at the most. Right around the same for Gas Piston Engines. The larger Gas Turbine Engine cores are closer to 40% Thermal Efficiency.
Most of the heat energy of any combustion engine extracting heat energy from...
It's not so much "more heat" from less fuel than it is 'asymmetrical heat distribution'.
Gasoline Flame Front speed increases with leaner fuel mixture at idle RPM leading to hot spot temperatures absorbed into the cylinder wall & head that aren't as easily purged out through the exhaust valve...
Very true.
Most of the specifications of late-model American cars out on the market 2011 to the present have very high compression ratios and BMEP pressures with much lower displacement and better composite alloy materials than they did in the past. Not just the German & Japanese cars.
But we...
Increasing compression will increase internal cylinder pressure and therefore increase internal cylinder temperature and hastening thermal runaway and overheating even more.
Usually like during a traffic jam where there is stop-and-go driving one tends to see an increase in engine...
boneh3ad,
Thanks for the correction.
My my previous comment is full of errors and and over-simplified. It's been a while since I did any work with High Speed Aerodynamics for I have been working with Electrical & Piston Powerplants for the longest time.
Tell me what you think of the...
Back in the 1950's, Chrysler implemented a Turboshaft driven car which used a powerplant similar to the Allison 250 C-30 Turboshaft Engine.
Like with any heat-of-air-compression engine whether piston (diesel) or turbine (kerosene) there needs to be an external oil cooler since the extreme...
The easier way to do this is to use these formulas:
BMEP (Four-Stroke Piston Engine) in PSI = [(150.8 x Ft-Lbs Torque) / (CID)]
CID = Cubic Inch Displacement of entire piston engine
BMEP (Two-Stroke Piston Engine) in PSI = [(75.4 x Ft-Lbs Torque) / (CID)]
CID = Cubic Inch...
A Diesel Piston Engine reaches its maximum torque at a much lower RPM than a Gasoline Piston Engine because a Diesel Piston Engine has a very high Brake Mean Effective Internal Cylinder Pressure (BMEP).
A Four-Stroke Diesel Piston Engine only draws in air and then compresses this air to...
Basic Rules for Gasoline Burning In Piston Engines:
Too lean a fuel mixture = Flame front speed increases causing thermal runaway and overheating.
Too rich a fuel mixture = Flame front speed decreases, excessive carbon buildup in combustion chamber leading to hot spots.
Gasoline Flame...
When fluids at supersonic speeds flow over a given structure, the flow on the structure’s surface is usually always subsonic. But the flow above the surface at thicker parts of the fluid’s Boundary Layer will flow at supersonic speeds.
Structures to permit supersonic fluid flow are designed...
BMW piston engines tend to use advanced composite alloy materials that can withstand much higher internal cylinder temperatures & pressures than many of their competitors.
Because of this BMW can make their piston engines much smaller while compensating with higher internal cylinder...
To: AlephZero
Compressor Efficiency (CE) of course would vary based on power setting and environment, wouldn't it?
Let's say this particular gas turbine engine application is a TurboFan application used on an airliner. As in a twin spool gas turbine core whereby the low speed...
It seems as though formulation like this one should be readily presented along with the given physics theory. Apparently this isn't the case in many publications. It's almost like the idea is to make people search out for what should already be presented.
Most of this publication is complete...
But on an approximate or general level could I use this formula to publish approximate CDT air temperature rise in a technical training manual?
Provided I state that this is a very general approximation of CDT and that each make and model gas turbine engine core has its own specific and...
To: etudiant
So if I were to place a Temperature Sensing Probe right at the compressor discharge nozzle after the last stage of the compressor right in the Diffuser section of the given compressor and take the CDT (Compressor Discharge Air Temperature) experimentally, would this theoretical...