Questions tagged [engine]

For general questions related to aircraft engines; use the [jet-engine] or [piston-engine] tag if possible.

15 questions with no upvoted or accepted answers
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1answer
249 views

Is there any mechanism in engine mount to prevent shock loads on engine while landing?

How engine is mounted in wing is restricting motion in any direction but is it still resistant to shock loads, or is there any mechanism inside engine associated to bearings that will absorb shock ...
3
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0answers
49 views

What are the differences between a compressor wash on wing vs on test bed

I work in an aircraft engine overhaul facility and I’m trying to understand the process of compressor washing engines on Wing compared to washing them in a test bed. What process steps are different ...
2
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0answers
63 views

What is the main difference between 'continental fuel injection system' and 'Bendix RSA fuel injection system'?

While I'm studying Aircraft Engine system, I learned that there are two dominant kinds of fuel injection system : 'continental fuel injection system' and 'Bendix RSA fuel injection system' I tried to ...
2
votes
1answer
94 views

Which is better: a rotor / prop followed by a stator, or contra rotating rotors / props?

It is all in the title. I'm interested in power absorbed/used for a given thrust, or thrust generated for a given power (same diameters of course). Just thrust and power. Ignore materials, electric ...
2
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0answers
40 views

Are subsonic nozzle fully expanded?

this is about converging subsonic nozzles. Are they fully expanded? meaning exit pressure=ambient pressure? What about diverging subsonic nozzle? Are they fully expanded? what would happen if the ...
1
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3answers
170 views

What is the reason for this engine oil service procedure on a Bombardier CRJ?

Someone told me that servicing the engine oil on a Bombardier CRJ900 aircraft with the APU on could lead to the particular engine being overserviced. He then advised that the engine-oil service be ...
1
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0answers
71 views

What Microcontroller(s) is/are used inside the ECU of a CF6-80C2 engine?

The question came up at work today and no one knew the answer. Did some digging online and could not find anything definitive.
1
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0answers
54 views

When are pressure-swirl atomizers and airblast atomizers used?

I am a little confused as to when (during T/O, cruise, etc.) and how the combined pressure-swirl atomizer and airblast atomizer is used. Lefebvre writes that "the merits of the pressure-swirl ...
1
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0answers
1k views

What is the purpose of a fuse pin in a turbine engine?

what's the difference betweeen fuse pin and mounting bolts of an engine ? Are they the same ? Any digram of a GE-90 engine showing those would be appreciated.
1
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0answers
67 views

How can I use electric motor data with my prop data to obtain a power available verses velocity curve?

I'm not entirely sure this is appropriate for this forum but it's worth a shot... I have propeller data ($C_T$ , $C_P$ , J , and $\eta$) and very very limited electric brushless motor data (motor ...
0
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1answer
140 views

Will an axial compressor work with an ideal fluid?

Will an axial compressor, like the one described starting on page 275 of this book, work if the flow was assumed to be ideal (i.e. incompressible and inviscid)? Specifically, what mechanism will slow ...
0
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0answers
61 views

Where can PT-6 engine series starter-Generator diagrams be found?

Wondering if anyone can direct me to the spec sheet, diagrams, and breakdowns of a typical Starter-Generator for a PT-6, say a PT6-66 series or similar. And also who are the major manufacturers of ...
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0answers
77 views

Why are some exhaust cone exposed?

Some engines have an exposed tail/exhaust cone at their exit, protruding aft the nozzle. how does that affect the overall thrust and pressure distribution along the walls of the cone? is it's role ...
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0answers
50 views

Are throttleable rocket engines the less efficient the lower the power setting?

Are throttleable rocket engines less efficient the lower the power setting? Logically that would lead to lower pressures in combustion chamber and so lower thermodynamic efficiency. Or is it remedied ...
0
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0answers
51 views

How to calculate hydrocarbon emissions for large aircraft?

I found a paper which talks about hydrocarbon emissions from a small aircraft for piston engines, but I was wondering can I apply it to turbine engines as well?