How does a Rocket Engine Nozzle Work (Part 2) - What are "Shock (or MACH) Diamonds"?

#Shockwaves #MachNumber #Supersonic #Aerodynamics

Hi Everyone!

Welcome to Part 2 of my Rocket Engine Videos!

This video is MUCH more informative and covers a LOT more interesting content than Part 1.

If you missed PART 1 you can find it here at:    • How does a Rocket Engine (and Nozzle)...  

Have you ever seen a diamond like air pattern outside of a fighter jet afterburner or a rocket engine and wondered why that happens? These shock diamonds are typically seen in images of the SR-71 Blackbird and other supersonic aircraft. In addition, you can see these shocks in rocket engines tested at low altitudes.

These diamond like shocks are oblique shocks which form due to the over expanded conditions of the nozzle. Over expanded simply means that the pressure of the air at the exit is much lesser than the pressure outside (ambient). This causes shock waves to form to try and maintain the pressure equilibrium in the flow.

This video describes in detail, how these shocks are formed. If you are interested in jet & rocket propulsion, this video is a must see! In brief this video covers,

1) Shock Diamonds (why they form)
2) Oblique Shocks
3) Expansion
4) Nozzle Theory
5) Over Expanded Nozzles

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Best Wishes,
VDEngineering
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