JoshTheEngineer | How To: Find Mach Number from a Picture (Part 3) @JoshTheEngineer | Uploaded January 2016 | Updated October 2024, 7 hours ago.
Want to look at a picture of a bullet/plane/etc. and be able to approximate the Mach number? In the previous videos on this topic (linked to below), I showed three different methods of approximating the Mach number from angles measured in a Schlieren image.
Part 1:
goo.gl/50saau
Part 2:
goo.gl/gqK19N
For this video, I have updated my Taylor-Maccoll code such that it takes the shock angle and cone angle as inputs (I find them using the Measure Tool from GIMP), and computes the freestream Mach number. This is best way to approximate the Mach number from an image (for conical flow).
I will be explaining and posting my code that I used here in a future video, when I get around to finishing up the derivation of the Taylor-Maccoll equation. If you want to be notified of future videos, please subscribe to my channel.
Photo Credits:
School of Aerospace, Mechanical and Mechatronic Engineering
University of Sydney, 1998-2004
By NASA Glenn Research Center [Public domain], via Wikimedia Commons
NASA photo
nasa.gov/centers/armstrong/features/shock_and_awesome.html
Want to look at a picture of a bullet/plane/etc. and be able to approximate the Mach number? In the previous videos on this topic (linked to below), I showed three different methods of approximating the Mach number from angles measured in a Schlieren image.
Part 1:
goo.gl/50saau
Part 2:
goo.gl/gqK19N
For this video, I have updated my Taylor-Maccoll code such that it takes the shock angle and cone angle as inputs (I find them using the Measure Tool from GIMP), and computes the freestream Mach number. This is best way to approximate the Mach number from an image (for conical flow).
I will be explaining and posting my code that I used here in a future video, when I get around to finishing up the derivation of the Taylor-Maccoll equation. If you want to be notified of future videos, please subscribe to my channel.
Photo Credits:
School of Aerospace, Mechanical and Mechatronic Engineering
University of Sydney, 1998-2004
By NASA Glenn Research Center [Public domain], via Wikimedia Commons
NASA photo
nasa.gov/centers/armstrong/features/shock_and_awesome.html
![Explained: NACA 4-Digit Airfoil MATLAB Code [Airplanes]](https://i.ytimg.com/vi/QezOan1pVgs/hqdefault.jpg "Explained: NACA 4-Digit Airfoil MATLAB Code [Airplanes]
This video goes through a step-by-step description of the coding of a program to calculate the coordinates of a NACA 4-digit airfoil.
If you would like to know where the equations come from, please see my previous video, located here:
http://goo.gl/FcufZh
To download a GUI I made from this code, visit my GitHub linked to here:
https://github.com/jte0419/NACA_4_Digit_Airfoil")
![Explained: How I Set Up MATLAB Scripts [MATLAB]](https://i.ytimg.com/vi/SJ7z7fHpxM8/hqdefault.jpg "Explained: How I Set Up MATLAB Scripts [MATLAB]
In this video I show how I personally set up a MATLAB script before I begin any coding. The title of the code can be more descriptive than the actual name of the file. I like to include who wrote the code. This isnt necessarily important if youre the only one accessing your code, but if you write code in a framework with other people, this helps indicate who actually started the file.
The started and updated dates are important, especially if you have multiple versions of the code (e.g. Code_v1.m and Code_v2.m) because it will help you keep track of changes. I have (dated) notebooks in which I derive the math behind some of my codes, so I can easily compare last update of the code with my notes from that day.
Commenting your code is extremely important! Dont neglect to comment just because you think youll remember what you did. If you write enough code, you WILL forget why you wrote something the way you did, and comments help tremendously.
Code folding and selective execution (using ctrl+enter) can be very convenient when you want to run just a single section of code. I forgot to mention this in the video, but you can also select the code you want to run with your mouse, and then press f9. Im a sucker for code folded sections though.")
![Explained: NACA 4-Digit GUI Part 3/10 [MATLAB]](https://i.ytimg.com/vi/SbW1NDuvdJQ/hqdefault.jpg "Explained: NACA 4-Digit GUI Part 3/10 [MATLAB]
This is the third 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 code the initialization of the code, which governs what happens before the GUI is made visible to the user.
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")
![Streamline Geometric Integral VPM [Nx(pj) and Ny(pj)]](https://i.ytimg.com/vi/TBwBnW87hso/hqdefault.jpg "Streamline Geometric Integral VPM [Nx(pj) and Ny(pj)]
In this video, we go through the X and Y velocity expression geometric integrals for the vortex panel method. This is the last geometric integral derivation we will need.
RELEVANT VIDEOS
► Panel Methods Playlist
https://www.youtube.com/watch?v=bWjo3N9COz4&list=PLxT-itJ3HGuUDVMuWKBxyoY8Dm9O9qstP
NOTES
- Ill add notes here if I need to.
ERRORS
- If you see an error in the video, please let me know and I will include it here.
REFERENCES
Note: the links are Amazon affiliate links. If you do happen to want to buy the book and use the link below, it helps me out a little.
► Fundamentals of Aerodynamics, Anderson
https://amzn.to/3emVuXU
► Foundations of Aerodynamics, Kuethe and Chow
https://amzn.to/2yMg1Vi
► Theory of Wing Sections, Abbott and Doenhoff
https://amzn.to/2wvZyUt")
