Uploaded May 2017 | Updated September 2026, 2 weeks ago
Here's the next video in our quest to understand jet engine and rocket nozzles (among other things). We will be talking about the sonic state, which is also called the critical state or the star state.
These values are useful for determining whether flow through a nozzle is choked. If the nozzle is indeed choked, then the sonic state values (P*, rho*, T*, etc.) are the actual static quantities at the throat of the nozzle.
===== RELEVANT VIDEOS =====
→ Stagnation Relations
goo.gl/FMFUBA
→ Area-Mach Number Relation
goo.gl/Hp6uGQ
===== REFERENCES =====
► Notes by Matt MacLean
► Modern Compressible Flow, Anderson
► Elements of Gasdynamics, Liepmann and Roshko
► Gas Dynamics, Zucrow and Hoffman
===== THUMBNAIL =====
By Ad Meskens (Own work) [Attribution, GFDL (gnu.org/copyleft/fdl.html) or CC BY-SA 4.0-3.0-2.5-2.0-1.0 (creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons
Here's the next video in our quest to understand jet engine and rocket nozzles (among other things). We will be talking about the sonic state, which is also called the critical state or the star state.
These values are useful for determining whether flow through a nozzle is choked. If the nozzle is indeed choked, then the sonic state values (P*, rho*, T*, etc.) are the actual static quantities at the throat of the nozzle.
===== RELEVANT VIDEOS =====
→ Stagnation Relations
goo.gl/FMFUBA
→ Area-Mach Number Relation
goo.gl/Hp6uGQ
===== REFERENCES =====
► Notes by Matt MacLean
► Modern Compressible Flow, Anderson
► Elements of Gasdynamics, Liepmann and Roshko
► Gas Dynamics, Zucrow and Hoffman
===== THUMBNAIL =====
By Ad Meskens (Own work) [Attribution, GFDL (gnu.org/copyleft/fdl.html) or CC BY-SA 4.0-3.0-2.5-2.0-1.0 (creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons
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A waitbar (or progress bar) allows you to visualize when a program will finish. The argument to the waitbar fills up the bar with the percentage specified. While its a fun way to see how long you have to wait until everything is done computing, it is extremely time consuming, and I would probably recommend just outputting data to the command window using fprintf.")
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This is the last video in my 10-video series on coding a program in MATLAB to compute, display, and save a NACA 4-digit airfoil.
IN THIS VIDEO:
We add in the code for saving the airfoil data out to a text file. Both the LE to TE and TE to LE methods are coded. A comparison between the output from this code and the data from the UIUC airfoil data site (see link below) is made to confirm that our code works the way it should.
UIUC Airfoil Data Site:
http://m-selig.ae.illinois.edu/ads/coord_database.html
IN THIS SERIES:
Part 1/10 : https://goo.gl/9UBgbo
Part 2/10 : https://goo.gl/jRRcYJ
Part 3/10 : https://goo.gl/rSVLHo
Part 4/10 : https://goo.gl/HwHB39
Part 5/10 : https://goo.gl/AlDne8
Part 6/10 : https://goo.gl/7n1QP7
Part 7/10 : https://goo.gl/nTGleR
Part 8/10 : https://goo.gl/ez247P
Part 9/10 : https://goo.gl/8mXYcc
Part 10/10: https://goo.gl/ovBlbW
If youve made it this far, thanks for watching! I hope you enjoyed it. Let me know if you have any questions or comments.")
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This is a video describing the general technique of finding a vector normal to another vector, with an emphasis on its relation to CFD codes.")
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This video explains how to display both line data and scatter data on the same plot in Excel.")
