In case it is helpful, here are all the Wind Tunnel videos in a single playlist ru-vid.com/group/PLxdnSsBqCrrEbjML0UneRVLn8YDoxql-i. All the Flight Mechanics videos in a single playlist ru-vid.com/group/PLxdnSsBqCrrEx3A6W94sQGClk6Q4YCg-h. You can support this channel via Patreon at www.patreon.com/christopherwlum. Please let me know what you think in the comments. Thanks for watching!
Jason-AE512: This video provides an excellent foundation for understanding the basics of wind tunnel testing. It clearly explains how data is collected, emphasizing the importance of setup and instrumentation, which is crucial for beginners.
Thanks won't be enough the way you teach........infinite thanks to you......one request professor if u can make video on virtual wind tunnel.....it will be highly appreciated..
Hi, Thanks for reaching out. If you have questions or would like to request a video, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum or via the 'Thanks' button underneath the video. I'd love to have you as a Patron as I'm able to talk/interact personally with Patrons. Thanks for watching! -Chris
Chris, I showed this to my HS engineering class. It's EXCELLENT! They are inspired to build a small wind tunnel for 3D printed prototypes. Thank you so much for making great content.
Haha, that is great, I'm glad it was useful. You probably have some stories to share on this front also, right? Are you going to be making more videos? I saw your video on root finding using Matlab, good stuff!
Brian, great, thanks for waiting for it 😀. I hope to have the next two parts of this series out in the next two weeks. Hopefully I'll see you at a future video. Thanks for watching!
AE 512: Thank you for the detailed walkthrough of the wind tunnel. I always wanted to visit there during my undergrad but never got the chance to do so.
Sir I go through all your lectures on Flight ✈️ Mechanics ........best videos series on RU-vid.....Thank you so much....... waiting for next two videos.
AA516: 11:32 oh wow, our class went through the tunnel last year for one of the labs and I didn't even notice how small the clearance was. It would've been interesting to look at blade tips more closely.
Hi Christopher, thank you for your video. I am excited to see the following ones. I love the idea that you show how you get the aerodynamic data, required for designing a flight control. What I am missing here is a really important topic: Mach number and Reynolds number. If I want to match the mach number I have to change my reynolds number according to the right flow conditions. This is the reason why sometimes you have cooled wind tunnels. I think an example with a simple calculation would be helpful for everybody.
Helmut, thanks for the great comment. You are indeed correct, playing with scaling, Re, and Mach number manipulations all at the same time requires clever engineering solutions. I've tested at pressurized tunnels to get around some of these. We'll be looking at an example calculation in the next video. If you are subscribed hopefully you'll be notified when it goes live. Thanks for watching!
@@ChristopherLum Your channel is awesome! I would have liked my professors to explain it this way too. Instead, they just derived the formulas mathematically and the whole blackboard was full of math, nobody really understood. This is why it is so important to get practical examples like you do. Great Work!
AA516 - cool to see the framework build up given the geometry needed for the UW wind tunnel and all the considerations to setup the model properly to get quality data.
Is the electronic pressure scanner a Scanivalve product? JC Pemberton, a Boeing engineer, developed the Scanivalve mechanical pressure scanner in 1950s. This was the high tech item that replaced manometer boards, and wind tunnel facilities embraced these awesome devices. JC left Boeing and founded his company Scanivalve. Years later the company developed electronic pressure scanners (ZOC) that are commonly used along with internal strain gage balances.
Hi Christopher, your videos are spectacular. You are a brave of braves. God bless you dear, please could you share the video of the second part since it says it is deleted in order to understand better ... blessings.
Hi Yorman, the second video should be up and available. Where did you encounter the message saying it was deleted? If you let me know and I try to track down the incorrect URL and fix it, thanks.
I have subscribed to your channel. You have great lectures. You teach excellently. I cant wait for the next 2 videos. Is it possible to have it in less than two weeks? please? :(
AA 516 - Pretty cool to see this thing. I had the opportunity to sit in on an experiment during this past summer in the KWT. It was pretty cool seeing when you could see when it became turbulent and flow separation on the china clay
Unfortunately, no data reduction. I just sat in on them doing wind tunnel experiments. They were testing different airplane configurations to look at new supersonic plane designs
Hi Ryan, the flow angularity correction is going to be different for different tunnels. They obviously are shooting for zero cross flow and upflow but it is really hard to make this happen.
AA 516: I always thought it was really cool that we have such a large wind tunnel on our campus! If at all possible, it would be fun to potentially incorporate some sort of lab or final project in the future in 516 where we get to test a build in a wind tunnel.
AA516 - great video. I loved working with the wind tunnels during my undergrad, even though they were nothing compared to Kirsten. I hope I'm able to go to campus soon and check it out
@@ChristopherLum I did my undergrad at UT Austin; I worked with our subsonic and supersonic wind tunnels. The experiments were for class and all involved testing various shapes and aircraft models. Off the top of my head, I recall doing flow vis (smoke, oil, and tufts), pressure measurement, and Schlieren imaging, among a few others. I was always the person eager to run the wind tunnel and do all the hands-on work!
@@boeing797screamliner Nice, that is good to hear. Wind tunnels are a lot of fun and surprisingly they are still very relevant even in the age of CFD and numerical techniques.
I'm glad it is helpful. I hope you'll watch the other two related videos. Please let me know what you think about them and how it translates to your tunnel.
AE 512: Very interesting that mahogany wood was used for the propellers vs. metal or composites. I would think these would be better for their durability and lower likeihood of FOD in case of a part strike?
FOD is a big worry as as a shed part can damage or destroy a fan blade. There is a kill switch and a person whose job is to watch the model during a run and if they see something fall off the model they hit the switch ASAP
AA 516: When you worked at the KWT, how often were parts dislodging from models? If a part dislodged and did significant damage, is that something the customer would be financially liable for?
This didn't happen often (I saw it maybe once or twice). There are several safety mechanisms in place to prevent the part from making it all the way back to the fans. This is partly the responsibility of the tunnel to make sure the models are sound before turning the wind on.
AE512: I find it amazing that the external balance assembly has remained largely as-is since the tunnel's inception. Have there been any required upgrades or major overhauls completed in the time you were with UWAL? I'd imagine any new parts would have to be fabricated in-house, right?
There have definitely been a few upgrades since the beginning (they used to take data using analog/manual techniques, AKA looking at dials and writing things down).
AA 516: Does the 3x3 wind tunnel at UW follow the same general data acquisition process? Are there any major differences/considerations for using it because it is smaller and generally lower speed?
Patrick, great question. In short, no, I don't believe the 3x3 has the same corrections. You may want to check with Prof. Knowlen or Williams as they might know if there are actually any corrections being applied to the data for the 3x3 tunnel.
Hi Marcos, this is just an arbitrary data sampling rate and duration that this particular wind tunnel uses. This effectively means they take 500 data points (100 Hz * 5 seconds) and then average these 500 points to get a single data point for that condition.
