Understanding Shock Waves in Aerospace Applications

ESG PEV Spring 2015

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David Sherwood
Created 5/3/15
This educational video is a student production of MIT's Experimental Study Group with assistance from the Department of Aeronautics and Astronautics. The purpose is to provide an exciting and interesting introduction to shock waves and their applications in supersonic flight for individuals at the undergraduate level.
With assistance from Professor David Darmofal, I introduce the concepts behind shock wave formation and delve into the difference between the three main types of shocks. Placing this analysis in the context of aircraft design helps students draw conclusions and hopefully sparks their interest about this crucial
topic.
For Additional information visit MIT OCW Aerodynamics:
ocw.mit.edu/courses/aeronautic...
Soundtrack - Kevin MacLeod (incompetech.com/wordpress/auth...)
SR-71 Animation - TechLaboratories ( / @techlaboratories )
Traffic Animation - Andrew Marr (ru-vid.comUCn2lg...)
Aircraft footage courtesy of Tails22 ( / @tails22x )
Special Thanks to Dave Custer, Graham Ramsay, and David Darmofal

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24 июл 2024

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Комментарии : 80

@najeebrazeq4807 8 лет назад

I learned more in this 8 minute than in the 4 lectures with prof

@233kosta 7 лет назад

Your professor isn't very good then

@banama1758 5 лет назад

bullshit

@backandforthpoet1612 5 лет назад

maybe you should put ypur phone away during lectures

@nutritionfacts6429 5 лет назад

you are wasting 40K of tuition for something that you can get from youtube, dear stranger if you think this guy can provide better education. oh i forgot, you need the paper :P

@rudhdamshende8696 3 года назад

True brother. I have Test tomorrow. Pray for me 🙏🏻😂

@MrClijun 3 года назад

5:16 I don't remember the that the velocity downstream (after) the shock increases higher than the upstream (before) the shock, it's actually the opposite. from what I studied is the velocity component parallel to the shock will be the same before and after an oblique shock, but the velocity upstream will make an angle (Beta) with the shock, and downstream will make an angle (Beta - Theta) which causes the component normal to the shock of V2 will be less than its counterpart in V1, which make the magnitude of V2 less than V1

@professorcuppoletti5336 2 года назад

Yes, this is correct. I also realized that this video incorrectly states that the air velocity "speeds" up through oblique shocks and that oblique shocks have "little effect on drag". This is incorrect. Oblique shocks create less drag and flow deceleration than normal shocks or bow shocks, but the Mach number always decreases across an oblique shock. For a normal shock the Mach number after the shock must always be subsonic but through an oblique shock, supersonic flow can be maintained, but the Mach number will still decrease.

@watermenlon3617 Год назад

that is true, the velocity of the air only speeds up at convex corners which creates expansion waves. the complete opposite of oblique shockwaves. expansion waves are often referred to as the antithesis of oblique shock waves.

@samspade8612 10 месяцев назад

Best explanation of Shock Waves I've ever heard or seen. Bravo!

@vikrantvijit1436 2 года назад

Superb conceptual representation of knowledge based Shockwave phenomena, principles and patterns surfacing design decisions focused on applications areas.

@firestorm734 5 лет назад

This video is absolutely fantastic!

@WorldEagleKW 6 лет назад

Great video, short and concise explanation!

@ethanloewenthal6528 5 лет назад

6:50. My understanding is that wing sweep is used to avoid shocks all together, not create oblique shocks instead of normal shocks.

@Kebab_with_extra_garlic_mayo 4 года назад

thats true as it increases the percieved chord of the wing, I'm suprised by how many errors this video has

@peterterwilliger8190 4 года назад

@@Kebab_with_extra_garlic_mayo The bad part is that he sounded so very sure of himself. Even worse, some people will believe him without checking his figures .

@theboatcheat1204 2 года назад

I think you might be thinking of the sweep being used to keep the wing leading edge behind the oblique shock from the nose. He was referring to an oblique shock on the leading edge of the wing I think - but still don’t agree that it accelerates the air!

@CharlesVanNoland 2 года назад

@5:40 I know I'm 7 years late but this diagram of the engine doesn't take into consideration that when it's in flight the cone lifts up straight. It is pointed down as a side-effect of the spring loaded mechanism that causes airflow to retract it to optimize compression on air intake - and when it retracts it straightens out and no longer points downward. The downward slant of a stationary SR-71 engine cone is just a side effect of the retraction mechanism. It's basically just dangling out there when not cruising through the sky.

@jithu9484 2 года назад

What a superb video. So helpful

@hakeemnaa 2 года назад

2:30 thanks always relate what you understood to something you know and you will never forget

@villiamo3861 Год назад

Superb video. Thank you.

@Thompsonje 6 лет назад

Terrific presentation for understanding shock waves.

@salvatorelucanieddu3417 4 года назад

many things in this video are wrong

@flyworldwide8961 3 года назад

Best explanation ever thank you.

@rajveerramesh956 5 лет назад

I LEARNT MORE OVER HERE THAN MY ACTUAL CLASS THANK YOU!!!!!!!!!!!!!!!!!!!!!!!

@salvatorelucanieddu3417 4 года назад

everything is wrong here dude

@paolomaldini3082 4 года назад

Sorry you were mistaken about oblique shockwaves. M2T1, P2>P1 and rho2>rho1

@womineer 8 лет назад

@6:34 Shouldn't it be M>1 not M>0 for supersonic and vice versa for subsonic?

@abhishekverma1422 8 лет назад

ya it should be M>1

@andreamarchionni2560 8 лет назад

This is a very simple but amazing way to demonstrate this phenomenon

@Fickoch 2 года назад

I have to say it… all this talk about waves and your audio for this video is killing my synapses!!!

@WildBillCox13 4 года назад

Fascinating. Thanks for posting. Liked and linked.

@sujangowda6230 5 лет назад

Good explanation

@johno9507 Год назад

I remember my aero engineering instructor telling us after we had just studied subsonic aerodynamics to forget everything we just learnt as supersonic aerodynamics is completely backwards.

@ManualMaestro 5 лет назад

4:46 looks like the notation on theta and beta is reversed

@adnenmez 6 лет назад

5:15 you should revise that statement

@gerardoespino4382 5 лет назад

I agree, I believe M1>M2. Per my understanding, through an oblique wave, M2 will still be supersonic, but lower than M1. Good video though.

@SergioHidalgoAero 5 лет назад

@@gerardoespino4382 it dependes on the angle of the shock wave and on the M1, there is no a general way to say " After the oblique shock wave the air is always subsonic"

@varun3681 4 года назад

Can u explain that part im confused

@MrClijun 3 года назад

exactly!

@ethanloewenthal6528 5 лет назад

3:50. Almost all of that is a "mach wave" traveling at the speed of sound. Only the area very near the ball is a "shock wave" traveling greater than the speed of sound, i.e. with the ball.

@erinlucassen 3 года назад

At 6.55; "swept wings such that normal shocks behave like oblique shocks" is quite a glaring mistake. But other than that thank you for a very informative video!

@fulmen67 5 лет назад

Oblique shocks decelerate the flow. The expansion waves are the oblique waves which increase the mach number instead.

@Burrahboy 8 лет назад

Thank-you, concise and interesting.

@alexrosellverges8345 5 лет назад

Really good video, thanks!

@LordBagdanoff 2 года назад

Why does the bigger fan suck more air and becomes slower in speed?

@pureawesome01able 6 лет назад

Very informative video, although there are slight errors, overall the video is very helpful

@jonnyueland7790 2 месяца назад

The expert in the first part, soundwaves/pressurewaves? Dont go faster than the wing they are simply just pushed out of the way.

@dennywey9816 3 года назад

Have to point out another mistake. Supersonic means faster than the speed of sound, i.e. the speed at which mechanical wave propagates, NOT the speed of air molecules. This is a common misunderstanding

@MrGonerman 4 года назад

oblique shockwave decrease the Mach but is still supersonic please correct this video

@comradelevothyroxine5133 3 месяца назад

this guy still alive?

@MrFraGal 6 лет назад

This viedo is full of big mistakes. M

@gamersvalley 4 года назад

It's actually 0.3

@139skylab931 3 года назад

@@gamersvalley M=0.3 is a boundary of compressible/incompressible flow

@427SuperSnake1 6 лет назад

That F-22 was not supersonic...

@peterterwilliger8190 4 года назад

427 SuperSnake1 Thank you, Yes, it was just loud .

@thethirdman225 4 года назад

Sound edit.

@ShubhamKVyasaed 5 лет назад

You sir please clear your concepts before teaching...@ 5:16 you mentioned M2>M1 which is incorrect. The shock wave causes flow to decelerate so M2

@benmax1295 3 года назад

thumbnail shows this guy was literally shocked

@crimsonwreb3132 3 года назад

Great video, it has some mistakes like the comment says but if the one watching has some logical thinking he will easily see that it’s a mistake. The biggest one that can misdirect people is the fact that you say the flow will accelerate past oblique shockwaves, this isn’t true. Airflow always decelerates with the encounter of a shockwave!!!

@Kebab_with_extra_garlic_mayo 4 года назад

this vdeos should be taken with some grains of salt, lots of simple errors here