Explained: Nozzle Mass Flow Rate

[@burggerbig102]

That's a lot of math. I love it.

[@steffenleo5997]

Well explained Video ...thanks a Lot...👍👍

[@AbhishekSinha-b3o]

Hey, I am looking for all the static values like Po, To, A*, gamma , R for SSME engine … can you please help me out through this

[@joro8604]

If you are trying to flatten out an air mattress or beach ball or let out air out of bicycle tire, is the air going sonic and choked? is that why the harder you press, it doesn't seem to deflate any faster? Are those shock waves coming out?

[@adhithasimhanraghavan7516]

Lower stagnation temperature means low enthalpy at the stagnation and which when expands gives lower exit velocity. So is there any limit to which the stag temperature can be lowered or it's just free of any boundaries?

[@JoshTheEngineer]

The stagnation temperature is usually dictated by the combustion temperature of the fuel and oxidizer, so there's usually not too much you can do about that. Everything ends up being a trade-off though. For a perfectly expanded nozzle, the thrust will be equal to the mass flow rate times the exit velocity. If we had control of the stagnation temperature, then we could increase the mass flow rate by decreasing the stagnation temperature. But decreasing the stagnation temperature will have effects downstream as well, because the exit velocity (which also affects thrust) will change based on the exit static pressure, which sets the exit speed of sound. The main point is that most properties are connected to each other in more complicated ways than they appear at first.

[@adhithasimhanraghavan7516]

JoshTheEngineer Yes..I get that. The parameters that govern the practical working of the nozzle are deeply intertwined.

[@junuhunuproductions]

You are awesome man.

[@JoshTheEngineer]

Thanks!

[@jessimaparveen.h9691]

Hey Will you make a video for hybrid rocket motor vertical stand

[@JoshTheEngineer]

I don't know enough about hybrid rocket motors to make a video on that topic unfortunately. But maybe some time in the future!

[@jessimaparveen.h9691]

No for making a stand we need to study about the fuel injection and ignition part that's enough for making the stand but incase of vertical stands we should consider gravity.

[@parthmatta26]

Wait I think I am a little confused. What does Chocked flow mean in a Converging-Diverging Nozzle? Is it that the back pressure is equal to exit pressure and the nozzle outlet (and does that mean there is a normal Shock at the exit?), or does it have something to do with the nozzle throat? Thanks in Advance

He explains nothing just rambles off mathematical formulas, not even sure there legit

[@JoshTheEngineer]

In my opinion, the most useful explanations are the ones that show you where the equations are coming from.

[@junuhunuproductions]

@@JoshTheEngineer Haha your video made me understand rocket eq. much deeper than before! All the knowledge / equations I saw in the book 'Design of Liquid Propellant Rocket Engines' is now making sense....