Boundary Layer and Thermal Management

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How Does A NASCAR Wind Tunnel ACTUALLY Work? Behind The Scenes in an Official Testing Facility!

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What happens here

Gary explains the complex system for managing the boundary layer (a layer of slow-moving or 'dead' air that forms on surfaces). He points out a series of jets that blow air, preventing the boundary layer from forming, and suction slots that remove the slowed air. These systems prevent unwanted turbulence and ensure accurate measurements. He describes this as a three-generation system that's continuously refined. He also explains the necessity of air-to-air intercoolers to manage the significant heat generated by the powerful compressors (up to 3000 horsepower) that drive the boundary layer control system, highlighting that electricity consumed directly translates to heat. The tunnel's air conditioning system has a massive 250-ton capacity to counteract this heat.

Goal: Understand how the boundary layer is controlled and heat is dissipated.

Tools and materials

Air Conditioning System — Maintaining optimal temperatures within the wind tunnel
Air Jets — Blowing air to energize the boundary layer
Air-to-air Intercoolers — Cooling compressed air before injection into the boundary layer system
Compressors — Generating high-pressure air for jets and suction
Suction Slots — Removing slow-moving air from the boundary layer

What they say

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part this wind tunnel is just a very big channel that's controlling the airflow. So using a lot of very expensive materials is not only unnecessary but you have to remember we did not have a big budget and uh it took us a while to get the financing even with all the money we brought up front and all the people the grassroots level people who were helpful in in making this thing happen. It still came down to we had to be absolutely as economical as possible. We didn't build this thing out of high-tech materials um for a very specific reason. It's the reason that your car is not built out of titanium. Uh it would cost 200,000, half a million, I don't know what, but you build it out of the materials you need to to get the job done. So, we actually had some of the race teams laugh and say, "Gee, it looks like you went to to Lowe's home improvement uh to to get your building materials." And the answer is, well, actually, we did some of our materials. The floor is concrete. That probably doesn't surprise you. The I-beams are all steel because whether they weigh 1 ton or 10 tons makes no difference whatsoever. So the the the bigger skeleton is all I beams and then the smaller skeleton within the I-beams is all wooden spars. You know, this construction is really no different than than say the floor of your house where you have all of the runners and you apply the floor. In this case, we had to cut all of the ply or all of the uh 2 by six's at a with a curve built into it. And then we laid the plywood onto the curved spars of wood and that shaped not only the contraction, but the diffuser as well. Now, inside the wind tunnel, we'll get into the test section. That is a little bit different material. I wouldn't say it's high tech, but it's a it's a different uh design and a different material than what you might expect. It's not using a lot of wood or even metal in this case. Where did you learn all this stuff? Well, I went to General Motors Institute. I'm a gear head. I actually uh got my degree in engine design and thermodynamics. So, I thought I was going to spend my whole career building engines and uh understanding crankshafts and cams and heads and all that. Uh, one year out of school I got the opportunity to get into aerodynamics. I said, "Well, gee, at General Motors, there probably have to be a thousand engineers that are working on engines. There were only seven that were working on aerodynamics." So, I said, "I think I like my odds there." So, uh, I joined…

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