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Water is kept out because the oil is supplied to the bearings at a higher pressure than the surrounding air, so the oil mist is blowing away the air, not the other way around.

Your question doesn’t make complete sense, because to model the performance of an engine, you need a lot more parameters than the 3 listed. In addition, the first one can be calculated from the second …

This is kind of half an answer, but the difference between active tip clearance control and passive tip clearance control is in the definition of “active” and “passive”. An active system has some way …

They are actually the same thing. Hydro mechanical fuel controls often include the use of pneumatic pressure to regulate the fuel flow. Here’s an example of a simple one: http://blog.covingtonaircraft …

The answer to your question: Is it possible that supercriticality of the fluid (air) is one of the causes for compressor stalls or compressor surge ? ...is definitely no. Stall is caused by an …

I am not really sure what sort of engine failures you want to predict, but ECTM is usually used to detect things such as; Worn air seals Blade tip wear (compressors and turbines) Compressor fouling …

The CF34-3and CF34-10E are quite different engines. The -10 produces more thrust for a number of reasons: It has a higher mass flow. The CF34-3 has a 44 inch fan, while the -10E has a 54 inch fan. So …

From this answer a GE90: has a mass flow rate of 1,350 kg/s at take-off and 576 kg/s at cruise (at 10.668 km = FL350). It doesn't need to move at all to have air flowing through it. At stand sti …

Your understanding of Bernoulli's equation is correct, but the situation in a compressor is more complex, because energy is being added by the rotating blades. When subsonic flow decreases in speed, …

Thermal efficiencies are very rarely quoted for aviation gas turbines. The metrics of interest are specific fuel consumption, and power to weight ratio. While a higher thermal efficiency will increase …

There are two advantages; It's easier to match the compressor rotational speed with the turbine. Typically, the first stages of the compressor want to rotate slower than the turbine is required to r …

"N1" is the low pressure shaft speed, and "N2" is the high pressure shaft speed. N1 and N2 throttle cycles are when the throttle is moved up-down-up (or vice-a-verse), which causes the N1 and N2 speed …

It's not a high Mach number that gives a variable cycle engine an advantage over a turbofan. Most air-to-air combat happens at subsonic speeds, because drag gets very high when you start trying to tur …

See this answer for the difference between a SAC and DAC combustor. The EASA type certificate for the CFM56-7 also identifies which engines have the DAC and which have the SAC. The answer depends on e …

It's very likely the J47 turbine blades used wrought iron, with alloying elements of aluminium and titanium. The General Electric J47 turbojet is a very very old design - it first flew in May 1948, on …