Intro Brayton Cycle
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- เผยแพร่เมื่อ 4 ก.พ. 2025
- Pressure Ratio and Component Discussion: 0:10
Air-Standard Model: 5:26
p-V & T-s Diagrams: 8:24
Energy Balance - Heat In: 11:35
Work Out: 13:00
Heat Out: 13:15
Compressor Work: 14:00
Introduction of the Brayton Cycle.
Thank you so much for the clear explanation sir, I cannot express how much this video helps me.
Thank you! This is a very clear and helpful explanation of the Brayton cycle's thermodynamics.
If asked, I would suggest using a second page to develop the first law equations for specific heat transfer and work. Once it got cluttered, I got distracted.
Other than that, good explanation, especially in the beginning about how the 'imaginary' heat exchanger assumption works. Thank you.
The original Brayton engine used pistons. Air was compressed to about 70 psi and stored in a tank. At TDC of the expander piston an admission valve was opened allowing the pressurized air to pass through a valve and then through a burner where intermitent combustion occured in the expansion cylinder. At about 1/3 of the stroke the admission valve closed. The hot air continued to expand and performed work on the expansion piston. At BDC the exhaust valve opened and the combustion products were evacuated on the outward stroke. A portion of the work produced by the expander was used to drive the piston compressor. It's important to note the the true Brayton cycle was an intermittent combustion process used to combust air and fuel inside an expansion cylinder. Here's a video of an accurate copy of a Brayton engine. There are only 5 remaining original engines, all are in museums and none have run since the 1920's I got curious about how these engine operated so I made one... you can watch the video here, th-cam.com/video/0ORu1kzklfk/w-d-xo.html
Beautiful Description sir 👌🙏
How can 2 to 3 is constant pressure when we add the heat? Shouldnt it be the reverse where pressure increae with the increae of heat?
this frame rate is insane
If area under the curve on a PV diagram is work then why is there no work declared across the heat exchanger? Does that equation only refer to shaft work? If so please elaborate why.
Integral P dV for closed system. Integral V dP for int. rev. steady flow through open system, like heat exchanger. See Section 6.13 of Moran's textbook, or other thermodynamics textbook.
very illustrative video
Thank you for this explicit and easy to assimilate explanation. I have created a device with integral compressor, expander and rotational element (for work output). Are their ideal conditions of pressure ratio P2 vs P1, and is this in any way linked to the temp rise (or should be a factor of) and/or is their an 'ideal' temperature rise? If there are not ideals (and simply the higher the better), at what pressure and what temp rise would it challenge what is currently acheivable on a robust and scalable concept? I take it that the increased volume of the expander over the compressor is a direct relationship to its efficiency? And should the differnece in volume be identical to the increase in volume due to a specific temperature rise?
IELTS 9.0
Very, very well done. Thanks!
Mr. Randall, how much efficient the brayton cycle is?
Nice video, congrats
Thanks Sir great explaining!
Thank you very much Sir!
Thank you so much!
awesome video
well done thank you man
TRUE
oh yay its the 'true' guy again!:D
Thank you very much :]
Isn't 1-2 snd 3-4 process are isentropic process? h2 should be equal to h1
Entropy remains constant ..not enthalpy .
brilliant ! Thanks :)
where are the pistons?
+fattywagonman centrifugal compressor and centrifugal turbine are very common. Pistons not needed.
+Randall Manteufel George Bailey Brayton (as in the inventor of the Brayton cycle) only made piston engines.... In a Brayton engine combustion begins as the pressurized air enters the expander, at about 1/3 stroke the air is cut off and the hot gasses continue to expand until the end of the stroke when the exhaust valve is open. Other engines like the Barber, Roper, Buckett and Trewella operate with a continuous combustor placed between a compressor and expander. These were very low power and inefficient engines when compared to a true Brayton. If you are interested in watching a real Brayton engine run search "Brayton Hydrocarbon Engine". I made one since there are only 5 of them and the last time an original was running was the 1920's . I also made an engine that combines both the Brayton and Ericsson concepts... you can find the video by searching my channel or Brayton / Ericsson engine.
+Randall Manteufel Pistons may be better for small volume compressor / expander because small turbines are not very efficient at compressing or expanding. Pistons are still considered one the most efficient method to compress. I believe scroll compressors are the most efficient?
thanks !
thank you :D
Brazilian? Looks like.
5 people have disliked free knowledge. Why
because they didn't review and are trying to cram it last moment before exams and getting frustrated with themselves because they didn't manage their time enough and know they couldve done better and are taking theyre anger out on irrational things like dislike buttons
Just a few days ago the Technikum museum in Germany got one of the 6 remaining Brayton engines running... as far as I'm aware this is the first time an original Brayton engine has run since the 1920's th-cam.com/video/g7h3Hd40GfY/w-d-xo.html Very cool!
good!
Turkce icerik de olsa keske
Ya da ben ing ogrensem
Your explanation is great but video is slow, i mean not smooth when you point at something while explaining
nyce one
Did you mean nice? IELTS 1/9
@13:35 Blah blah blah