Wind Tunnel Testing: Introduction and Data Acquisition

Рет қаралды 14,413

Күн бұрын

This is the first of our 3 part series on wind tunnel testing. In this video, we introduce the concept of wind tunnel testing as well as discuss the process for acquiring aerodynamic data in a wind tunnel. We examine both force/moment data as well as non-traditional data such as pressure, flow visualization, and wake surveys.
Topics and timestamps:
0:00 - Introduction
1:04 - Why perform wind tunnel testing
4:19 - The Kirsten Wind Tunnel
17:03 - Data acquisition process
21:31 - Flow visualization
Lecture notes and code can be downloaded from github.com/clum/KZfaq/tree/...
All Wind Tunnel videos in a single playlist ( • Wind Tunnel Testing )
All Flight Mechanics videos in a single playlist ( • Flight Mechanics )
#FlightMechanics #WindTunnelTesting #UW
You can support this channel via Patreon at / christopherwlum or by clicking on the ‘Thanks’ button underneath the video. Thank you for your help!

Пікірлер: 76

@ChristopherLum 3 жыл бұрын

In case it is helpful, here are all the Wind Tunnel videos in a single playlist kzfaq.info/sun/PLxdnSsBqCrrEbjML0UneRVLn8YDoxql-i. All the Flight Mechanics videos in a single playlist kzfaq.info/sun/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!

@WalkingDeaDJ 2 ай бұрын

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.

@reesetaylor3506 2 ай бұрын

AE 512: Walked past this building everday for 3 years and never had the chance to go inside, thanks for the virtual walkthrough!

@ChristopherLum 2 ай бұрын

I know, there are several buildings on campus that I never know what is going on inside :)

@BryanLiberman-cq4ml 2 ай бұрын

AE512: Thanks for the video! Loved the little shaoutout of you in the original wind tunnel video!

@RWIKDGR8RANA 5 ай бұрын

AA 516 : really awesome explanation and glad such a system and setup exists at UW

@SayedTorak 2 ай бұрын

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.

@kurtcobainsr 3 жыл бұрын

This is great! Been waiting for this video to come out! Cant wait to see more Flight mechanics videos in the future!

@ChristopherLum 3 жыл бұрын

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!

@jordantriolo571 2 ай бұрын

AE512: Interesting to see the variety of data and objects tested in wind tunnels

@edwardmau5877 2 ай бұрын

AE 512 Didn't know how much historical data has been kept, pretty cool.

@zaneyosif 2 ай бұрын

AE512: Interesting to see a different wind tunnel compared to what I experienced in undergrad. Very nice feature of the real time plotting!

@chayweaver.2995 Ай бұрын

AE512: Cool to get to know more about how wind tunnel testing works

@petermay6090 5 ай бұрын

AA516: Cool to have an inside look at how the Kirsten wind tunnel works!

@eeproflady1522 10 ай бұрын

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.

@ChristopherLum 10 ай бұрын

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!

@daniellerogers5959 Жыл бұрын

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.

@ammardalati510 3 жыл бұрын

thank you! i am a student at CSUF and this is helping me at ours

@sianhoan833 Жыл бұрын

AA516: Always excited to learn about wind tunnel! I was amazed when we got to tour KWT and go in its test section for a Junior lab.

@ChristopherLum Жыл бұрын

Yes, it is pretty neat to stand in the test section and look at the bellmouth!

@aimeepak717 2 ай бұрын

AE512: Keeping data dating back to the 1930s in a vault was a fun fact!

@EomjiKim 5 ай бұрын

AA516: I haven't been to the wind tunnel place of uw yet but it was interesting to have virtual tour through your video

@kinfongyeung5400 6 ай бұрын

having your department named after the founder of Boeing is such a giga flex

@rishabhjaiswal290 3 жыл бұрын

Sir I go through all your lectures on Flight ✈️ Mechanics ........best videos series on KZfaq.....Thank you so much....... waiting for next two videos.

@ChristopherLum 3 жыл бұрын

I'm glad it was useful. The next video just went live, feel free to check it out and let me know what you think. Thanks for watching!

@helmutk.4178 3 жыл бұрын

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.

@ChristopherLum 3 жыл бұрын

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!

@helmutk.4178 3 жыл бұрын

@@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!

@technontechwithsumitohdar932 Жыл бұрын

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..

@ChristopherLum Жыл бұрын

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

@shavykashyap 5 ай бұрын

AA516 : Very cool !

@hasanhorata8381 2 жыл бұрын

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

@ChristopherLum 2 жыл бұрын

Hasan, that is great, what type of test were you conducting in the tunnel? Did you get a chance to do any data reduction?

@hasanhorata8381 2 жыл бұрын

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

@ChristopherLum 3 жыл бұрын

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.

@sethwhittington28 2 жыл бұрын

AE512: Great intro to wind tunnel testing! Not a field I have any experience in.

@rowellcastro2683 5 ай бұрын

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.

@wrightmf 5 ай бұрын

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.

@boeing797screamliner 3 жыл бұрын

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 3 жыл бұрын

Gary, that is great to hear. Where did you work with wind tunnels in the past? What types of experiments did you run?

@boeing797screamliner 3 жыл бұрын

@@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!

@ChristopherLum 3 жыл бұрын

@@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.

@adrianjeromegujilde3011 3 жыл бұрын

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? :(

@ChristopherLum 3 жыл бұрын

I'm glad it was useful. The next video just went live, feel free to check it out and let me know what you think. Thanks for watching!

@anna-nimura-yates Жыл бұрын

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.

@ScholarlySpace 9 ай бұрын

What's AA 516?

@burningbush2009 2 жыл бұрын

AE512: Great video! Is the Kirsten wind tunnel unique in its very low flow angularity? Or are those pretty standard values for a large wind tunnel?

@ChristopherLum 2 жыл бұрын

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.

@Indefinite87 2 жыл бұрын

can you explain rod type internal wind tunnel balances?

@marcosszmania5874 2 жыл бұрын

AE 512: Hey Professor Lum, I did not understand what the 100 Hz for 5 seconds represent, could you elaborate on that? Thank you.

@ChristopherLum 2 жыл бұрын

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.

@ThomasNiemisto 2 жыл бұрын

AE 512: Very impressive that this wind tunnel has seen over 80 years of service. Can't think of many other things that have lasted that long.

@ChristopherLum 2 жыл бұрын

Yeah, it is pretty neat although there have been a few upgrades since the beginning (they used to take data using analog/manual techniques).

@yormanjorcetquispechavez3330 3 жыл бұрын

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.

@ChristopherLum 3 жыл бұрын

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.

@yormanjorcetquispechavez3330 3 жыл бұрын

@@ChristopherLum Please could you put a Spanish subtitle on the video you posted a few hours ago, please greetings from PERU

@Gholdoian 2 ай бұрын

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?

@ChristopherLum 2 ай бұрын

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

@ahungryflyer 2 жыл бұрын

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?

@ChristopherLum 2 жыл бұрын

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).

@patrickfollis9417 2 жыл бұрын

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?

@ChristopherLum 2 жыл бұрын

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.

@patrickfollis9417 2 жыл бұрын

@@ChristopherLum Thanks! My capstone group will likely be using the 3x3 tunnel so we will look into it

@PatrickGalvin519 5 ай бұрын

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?

@ChristopherLum 5 ай бұрын

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.