Hypersonic Hijinks Part 1 - Compression Lift

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This is the first of two videos which will conclude by discussing waveriders and other lifting body hypersonic vehicles. This first video reviews topics such as normal shocks and oblique shocks, as well as introduces the phenomenon of compression lift. A basic understanding of these topics is required to properly understand the weird and wonderful world of waveriders.
Hypersonic vehicles and waveriders have been a hot topic in the news recently, and I hope these videos will help demystify some of the aspects of how these vehicles operate.
#shock #shockwave #mach #machwave #sonicboom #gasdynamics #compressionlift #waverider #hypersonic #missile

Опубликовано:

14 окт 2024

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Комментарии : 17

@TheGravityAssistant 2 года назад

I made a mistake at 7:18 - the geometric explanation of the shock angle I gave is actually for a Mach wave. I've blurred the offending illustration to prevent confusion and I will post a short video in the future to explain the difference between Mach waves and shock waves correctly. The general 'hand-wavy' logic can still be applied, however, the pressure and density after the shock wave are higher than before and the flow is deflected. A Mach wave is the 'sonic boom' that we hear far away from a supersonic vehicle. The air flow is not deflected across a Mach wave. At the end of the wedge, expansion fans and shock waves act to reduce the pressure of post-shock gas back to ambient pressure and convert the shock wave into a Mach wave.

@fademusic1980 2 года назад

"can be thought of like mike tyson, smashing the air into submission and destroying any nearby ears" 10/10

@mastershooter64 Год назад

9:35 yooo dudee whaaatt?? awesome!! nice!

@SACR3DBAC0N 2 года назад

Wow, very straightforward and thorough. When you put an angle of attack on the wedge in that animation, everything just clicked into place as for what compression lift is.

@TheGravityAssistant 2 года назад

Thanks for the kind words, I'm glad it was helpful!

@challacustica9049 2 года назад

Best explanation on RU-vid, very clear and each to understand.

@TheGravityAssistant 2 года назад

Thank you for the kind words!

@jonahgimmi1528 2 года назад

Ah, its been a while since I posted my comment to the last video asking for something on compression lift, if this was at all related to that thank you so much.

@TheGravityAssistant 2 года назад

No worries! Please let me know if you have other suggestions for topics!

@andieeidnaandieeidna 2 года назад

you need to push your content more on reddit, twitter or someplace. I really enjoy your explanations and want to see more in the future.

@TheGravityAssistant 2 года назад

Thanks for the kind words and the suggestions.

@icojb25 Год назад

Where is part 2!!!!

@saimadhav7695 2 года назад

Great video. Can I know what software or tool you used to illustrate the flow field and post shock properties?

@TheGravityAssistant 2 года назад

Thanks for watching. The flow field is solved and animated in MATLAB.

@dsdy1205 2 года назад

10:06 Increased drag is also beneficial because the distance from the shock to the shuttle body is maximised, which reduces heat conduction and radiation from the solar-temperature shock to the shuttle body.

@TheGravityAssistant 2 года назад

Thanks for watching, I can tell you've red the pre-class notes! You're right that blunter bodies have greater shock stand-off distances at the stagnation point, which reduces the thermal gradient and therefore conductive/convective heating of the shuttle nose and leading edges. Something that I'll talk about in a future videos is how large shock stand-off distances actually increase the amount of radiative heating in the stagnation regions. Luckily, radiative heating only becomes dominant at atmospheric speeds of 10-15 km/s and above, which is why it's a relatively minor concern for Earth vehicles. If you google some images of the Apollo capsule TPS (which entered Earth at ~11 km/s) and the Galileo probe (which entered Jupiter at ~47 km/s) you can see that the Galileo probe is much more 'pointed' to reduce the amount of radiative heating. If you have access to Hypersonic and High Temperature Gas Dynamics by John Anderson, there's a good case study of the Galileo probe with more details.

@dsdy1205 2 года назад

@@TheGravityAssistant Wow I didn't know that, thanks!