Great build! I have used a similar sized vindtunnel in the past. Unfortunately it was scrapped and I do not have access to it anymore, so I have been considering building one. It was a little larger but rather similar to Yours with 3 exchangeable perspex test sections. The cross sections ranged from 120mm square to about 500mm. Max airspeed depended on the cross sections. Perhaps You could simply pressurize the smoke system from downside the main fan. It will then tend to self regulate with different air speeds. Also regarding the previous UV light tip, it works great! Have used this to take pictures with a strong strobe light using an added fluorescent dye. If You have 2 timed flashes it is even possible to measure velocity using small aerosol droplets... What is the airspeed range with the automotive fan?
Awesome video! really detailed and thorough. I'm currently working on a wind tunnel for my senior design class. What sensors and controllers did you use?
I am still working on the sensors and instrumentation. I hope to pull a video together once I get everything working. Everything will be Arduino based and I expect I will have to develop my own interface
Thanks for the video. I have built a wind tunnel using yours as a guide but am having trouble seeing the fog clearly. Its easier to see when the fan is slow but we did the calcs on the fan and it doesn't even run that fast. Approx 4km/h. I am using a 1/4 inch copper tube. I was wondering did you have this issue and if so, how did you fix it? Thanks again.
Smoke visibility was a BIG issue for me and I spent a lot of time on it. What it came down to for me was a combination of things. First, I painted the inside of the chamber flat black, the flatter the better, to reduce reflections on the glass. I put a window in the top where my primary light it. This light is extremely bright and is supported 3"-4" above the glass by a black frame to control the spread of the light and keep it off the front glass so it doesn't cause reflections. Lastly, and most importantly, I had to find the correct flow rate for the smoke. The higher the tunnel air speed the higher the smoke rate. I did this by pressurizing my smoke reservoir with a fan. While this was a bit of a hack it does work. The smoke needs to be pressurized because the tunnel airflow creates a bit of a vacuum in the smoke system and while it will draw the smoke out it isn't a high enough rate to have a clear view. I hope these suggestions help. Like I said in the video, this was the part of the project that I spent the most time on.
hoelang doe je met een liter rook vloeistof ? ik ben bang dat het te duur gaat worden om de rook te gebruiken. dus met een uur bijvoorbeeld non stop rook hoeveel ik hoor graag van u
Thank you so much for the walkthrough video, it really helps me out for my project. Wishing you all the best for your future projects mate🙏🏻
My pleasure. Good luck on you project.
Thank you so much for the walkthrough video, it really helps me out for my project. Wishing you all the best for your future projects mate
I’m glad it helped you out. It was a fun project, maybe someday I’ll get around to finishing 😜
Wow i like this wind tunnel project. You've inspired me with these videos.
Keep going mate.👍
Thanks! I appreciate that.
Great build!
I have used a similar sized vindtunnel in the past. Unfortunately it was scrapped and I do not have access to it anymore, so I have been considering building one. It was a little larger but rather similar to Yours with 3 exchangeable perspex test sections. The cross sections ranged from 120mm square to about 500mm. Max airspeed depended on the cross sections. Perhaps You could simply pressurize the smoke system from downside the main fan. It will then tend to self regulate with different air speeds. Also regarding the previous UV light tip, it works great! Have used this to take pictures with a strong strobe light using an added fluorescent dye. If You have 2 timed flashes it is even possible to measure velocity using small aerosol droplets... What is the airspeed range with the automotive fan?
Awesome video! really detailed and thorough. I'm currently working on a wind tunnel for my senior design class. What sensors and controllers did you use?
I am still working on the sensors and instrumentation. I hope to pull a video together once I get everything working. Everything will be Arduino based and I expect I will have to develop my own interface
Have you thought about using UV light to make the smoke show up better? Turning the lights off in the room/shed
No, I haven’t tried that yet but I will look into it. Thx!
@@DefiantWings sweet!
Thanks for the video. I have built a wind tunnel using yours as a guide but am having trouble seeing the fog clearly. Its easier to see when the fan is slow but we did the calcs on the fan and it doesn't even run that fast. Approx 4km/h. I am using a 1/4 inch copper tube. I was wondering did you have this issue and if so, how did you fix it? Thanks again.
Smoke visibility was a BIG issue for me and I spent a lot of time on it. What it came down to for me was a combination of things. First, I painted the inside of the chamber flat black, the flatter the better, to reduce reflections on the glass. I put a window in the top where my primary light it. This light is extremely bright and is supported 3"-4" above the glass by a black frame to control the spread of the light and keep it off the front glass so it doesn't cause reflections. Lastly, and most importantly, I had to find the correct flow rate for the smoke. The higher the tunnel air speed the higher the smoke rate. I did this by pressurizing my smoke reservoir with a fan. While this was a bit of a hack it does work. The smoke needs to be pressurized because the tunnel airflow creates a bit of a vacuum in the smoke system and while it will draw the smoke out it isn't a high enough rate to have a clear view.
I hope these suggestions help. Like I said in the video, this was the part of the project that I spent the most time on.
@@DefiantWings Thanks for the detailed comment. I will play around with presurizing the fog. I will also put a video on here.
@@christopherbrown1086 Video done yet?
Not yet. Too many projects and not enough time.
hoelang doe je met een liter rook vloeistof ? ik ben bang dat het te duur gaat worden om de rook te gebruiken.
dus met een uur bijvoorbeeld non stop rook hoeveel ik hoor graag van u
It lasts a long time. An hour of testing would be less than a liter. I don't know exactly how much it uses but I have not used very much.
you know how diy vapes work? a wick, a coil and supply of fluid and it can create a very steady and reliable stream of smoke
Can the fog machine be put into the bin?
You could but the fog solution leaves an oily residue on the inside of the reservoir and I didn’t want to have that all over my fog machine
👍👍👍👍