Questions tagged [jet]

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Nuclear pulsejet

As the title suggests, I am wondering about the feasibility of Nuclear powered pulsejet engines, including Radioisotope Thermoelectric Generators (RTGs). I am not talking about Nuclear pulse rockets, ...
NERDO's user avatar
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1 vote
1 answer
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Why are the rocket exhausts so different from rocket to rocket?

I have noticed that the exhaust flames for rockets can be either everywhere, like in this image or it can be hardly noticeable, like in this video. I am just curious, what makes this difference? Is ...
John Snow's user avatar
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Does 'Jet Impingement Cooling' always cool?

I understand that by using jet impingement cooling, we can achieve a high convective heat transfer rate, but there is also a stagnation region where the kinetic energy of the jet will be converted to ...
GRANZER's user avatar
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In the process of spraying liquid from the nozzle, must the pressure at the outlet of the nozzle be equal to the atmospheric pressure?

During my studies, with high Mach compressible fluids, I always set the outlet pressure to 1 atm. In that case I can roughly calculate the exit velocity. However, in the case of steady flow, is the ...
yuxuan's user avatar
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-1 votes
2 answers
118 views

Please explain engine thrust and aircraft weight

This is probably really easy for someone... But... My non-engineer head just cant seem to get an answer to this question in terms that are simple to digest. A new Boeing 777X has a max take off weight ...
Paul Stringer's user avatar
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2 answers
44 views

Is it true that pre-jet air planes used to fly much lower? If so, why?

I watched a video on the Concorde the other day. In it, they talked about the history of airplanes, and how the jetplanes now started flying "above the weather", and that the propellar-...
Audley Kosick's user avatar
1 vote
1 answer
124 views

Do stators in axial flow compressors have airfoil geometry?

In axial flow compressors the role of a stator is to gradually change the direction of flow to exchange some of the kinetic energy of the flow into pressure. Therefore it stands to reason that they do ...
Francis L.'s user avatar
2 votes
1 answer
88 views

What gives gas turbine/turbojet engines such high energy density?

What is the cause of turbojets'/gas turbines' high power to weight ratio compared to piston engines? They certainly use a generally less efficient thermodynamic cycle.
Francis L.'s user avatar
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1 answer
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Effect of speed of turbo fan in bypass jet engine

Why do we keep speed of turbofan of turbofan jet engine, low. And what is the maximum thrust a turbofan jet engine., how much can thrust a turbofan jet engine produce with just compressed air.
Marshall Jay Soni's user avatar
1 vote
0 answers
179 views

Basic dimension relationships in a valveless pulsejet engine

I'm willing to take my own shot at the construction of a blast supercharged valveless pulsejet, a holy grail among DIY jet enthusiasts. However, since my idea is not very compatible with the geometry ...
Francis L.'s user avatar
1 vote
1 answer
137 views

Does air pressure difference of intake exhaust contribute to jet thrust?

I know momentum of the airflow inside jet engine generates thrust, but what about the pressure difference in front of and at the back of the engine? The air sucking intake at the front has lower than ...
wav scientist's user avatar
2 votes
2 answers
419 views

Efficiency of TurboJet engines with nozzles

As per Bryton Cycles, most of TurboJet engines' Thermodynamic efficiency should be around 40%. Rest of energy gets rejected as waste heat in exit gases of after the turbine. But if these hot gases ...
SRD's user avatar
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