Wind tunnel Definition and 103 Threads

Hello all, I'm in my final year of engineering so I'm required to complete a thesis as part of that. My topic is to investigate the wind loading on a typical conveyor belt + truss arrangement, because there's a lot of uncertainty in industry about drag coefficients etc. I've attached a model...

Hi guys, I have been trying to measure the drag characteristics of a wind tunnel model by using a pitot-static tube set up. From which the transducer will output to me the stream-wise velocity profile based on the pressure differential measured. Following which, in order to evaluate the...

I am doing a wind tunnel experiment on aerofoil. So i need some idea to mount my aerofoil in the test section. The aerofoil is made of acrylic. So which type of stick will suitable for my aerofoil mounting. The configuration as shown in picture that attached. (Picture taken from google image).

For my research purpose, I made a wind tunnel which has 0.6m rectangular section [0.2X0.2sq. meter] and 1.4m long diffuser section having porous top [top wall angle is 20deg] as follows: Wind tunnel speed is 15m/s. Even using 20deg inclination of porous top wall, there is no flow...

So, I am totally not an aerodynamic engineer, but my boss - an organic chemist- thinks we should get a wind tunnel to test some new polymer coatings that our research group developed. In researching and calling around to companies that make wind tunnels, I got a question that i have no idea how...

i am making a wind tunnel in order to test aerodynamics of 1/24 scale cars. i am having two problem: 1. i am not sure what wind speed at that scale to represent 100mph. 2. i am using a fan that has an outlet wind speed of 19.4 mph. i tried to increase wind speed by decreasing the outlet...

Does anyone know of any simple aerodynamics simulators? Preferably one that would allow me to import a 3D model and then calculate its drag coefficient? I have done a few searches, but failed to find much of anything. Oh, and it needs to be free. Not part of some mutli-hundred dollar...

Hello! I am new and recently figured out how to make wind tunnels in 3ds max and Maya. Im helping to develop a sci-fi game and just out of curiosity took one of our spaceship models meant for space to planet travel into the wind tunnel to see if it would really be able fly, and if not, find out...

Greetings, for the school I must find some information about the building of a small close wind tunnel . Some one know where to find it? Good day!

I am making a wind tunnel to test the lift of an airfoil when chaning the variables of angle of attack and air velocity. For a good EEI I need more then 3 speeds. However, all the people I know only have 3 speed fans, I don't know how to get more speeds as the wind tunnel gets built around the...

I have done a lab experiment, to determine the coefficient of lift for an aerofoil, keeping the angle of attack constant. The equation I have used is Lift= (1/2) v times v times A times ρ times Coefficient of lLift v= Velocity of air ρ=air density A= planform area to give...

Hello, I am designing a rig to measure the rolling moment of a model aircraft. The rig will have a settable yaw, pitch and roll, but only the rolling moment is to be measured. The model aircraft will be similar to an Airfix model. Approx dimensions: L221 x W152. I was just wondering if anyone...

Hi physics peoples, [for the tl;dr peeps: is there any point plotting a force distribution when I already have a pressure distribution, aren't they essentially the same thing?] I've been doing wind tunnel experiments on structures for my final year engineering project, my supervisor (who I...

The original mass is 25.5g. The mass(G) we got were: 23.4 mass(g) - 7.7 Air speed(km/h) 22 mass(g) - 9.7 Air speed(km/h) 20.3 mass(g) - 12.1 Air speed(km/h) 19.2 mass(g) - 13.5 Air speed(km/h) 18.35 mass(g) - 13.7 Air speed(km/h) I needed to find the lifting force and the Speed in m s-1 So...

So we need to make a practical report and I'm not sure how to do it. I've learned the basics like lift equals weight and thrust equals drag.. and then the teacher made a model wind tunnel in class, we then got air speed(km/h) and its mass(g) etc. for it then we had to convert them to life and...

Hello all. I have a question about a wing model... The model I have is an airplane wing (airfoil) in a wind tunnel. The wing is supported at the quarter-chord length and the wing body is free to move. My model is in the time domain with an oscillatory force at 20 Hz applied to the wing...

Hey, I have to design a test rig for my university's wind tunnel. The test rig is required to measure lift, drag, pitch moment and rolling moment. The professor has asked me to keep the budget around 2k. I was looking online about what is available and came across 2 types of balances...

hello. i need to match electric motor to propeller/fan to my outdoor aeroduim wind tunnel. my requirements goal is to get a 2.00 meter diameter propeller with 190kh wind speed . which electric motor (type,power) would you think will properly match for this requirements ? thank you.

Hi friends I am a mechaincal engg. student and I asked yesterday my professor of fluid mechanics that there should be a educational wind tunnel in our laboratory to understand concepts of streamlines, lift and drag better and visually. He replied me with a challenge that I should make such a...

Hey everyone, first time user here! I'm doing a lab experiment with a small open wind tunnel and I'm having some trouble figuring out how to calculate the airspeed in the test section. There is a digital pressure gauge displaying what I was told to be the dynamic pressure. The pressure...

I live in Wisconsin and I am looking for a wind tunnel where I can conduct a number of airfoil experiments. Since I am in high school, I am not yet affiliated with a university, so it is difficult for me to get in touch with lab technicians at universities. I have successfully contacted the...

I have a question about Reynolds Number and wind tunnel tests. Last semester a few students at my university were conducting wind tunnel tests on a small model of a truck, they were trying to find ways to reduce the drag in order to save fuel. I would guess they were testing at a Reynolds Number...

Hello, I'm a senior year ME undergraduate and I'm building a low speed (velocity=30-45 m/s) wind tunnel for my college as a final year project. The initial size for the tunnel was 300mm x 300mm in the test section with an open circuit configuration. I've read some papers on the design...

In my current experiment, I am using a wind tunnel to test laminar flow over airfoils of various designs and at various angles of attack. My current dilemma is in deciding how to construct the airfoils. I am looking for a method that is precise and realistic. (At this stage, I am not worried...

for a physics project i am designing a vertical wind tunnel made out of stovepipe and powered by a leaf blower. this experiment is designed to find the terminal velocity of different shapes. We already have a way to vary the wind speed, but what we don't have is an accurate way to measure this...

Even though I’ve experienced the evidence firsthand I’ve never quite been able to totally accept that the treadmill and turntable tests accurately represent a cart being powered solely by wind (like many others). So I’ve built a circular wind tunnel to test DDWFTTW in a “real” wind and the cart...

For a school science project I am supposed to design an experimental process that utilizes the wind tunnel my school owns. I've built four small model towers out of wood - one a triangular prism, one a rectangular prism, one a cylinder, and one a pyramid - that all have the same height and base...

i'm currently building a wind tunnel for year 11 physics and need help mounting the aerofoil. The wind tunnel is basic (just cardboard and is circular), and i need a way to mount the aerofoil inside. The mounting has to be sturdy so that the aerofoil can have an adjustable angle of attack and...

Aerodynamics -- Wind tunnel I'm not sure if this goes under here since it's not actually homework but it's more of a general question for a paper I have to do, so if it's in the wrong place I apologize; simply tell me and I'll delete it or something. Okay well for my research paper I'm...

A wind tunnel model of an aircraft, representing only the rolling motion, is constructed using two small lifting surfaces mounted in the horizontal (i.e. x – y) plane symmetrically on an axi-symmetric body. The body houses a set of ball bearings, which permit the complete model to roll about...

Please help: We know that static pressure is the pressure felt when moving with the fluid (air). So in real flight the Pitot-static tube is moving with the aircraft and gives static pressure X (lets call it X). BUT in a wind tunnel the Pitot static tube is fixed (i.e. not moving) and the...

I'm not sure if this is the right place to ask, but would any of you have recommendations as to where I can get this online first or preferably second hand at its best price? Alternatively, do any of you have this book and you wouldn't mind selling? My country is plenty small and my whole...

HI i am looking some virtual windtunnel software that there i have to desgin a various nose cone and i have to find the shock wave formation at supersonic speed please some one help me to find the virtual windtunnel and CFD software regards Ryan

Or any specific requirments formulas that will help me on my way in building one please. Moderator's note: this thread is from 2008.

I have constructed a wind tunnel with approximately 15 x 15 in. cross-sectional area test section. Where can i get some ideas/plans to build a simple force balance that can measure lift and drag forces simultaneously? Currently I'm using a single-axis button load-cell setup to measure...

So I'm using a wind tunnel to show the aerodynamics of a toy truck which scaled 1:64 in the real world. My question is that if i wanted to show that it was going at 64 kilometers per hour in the real world, do i have to set the wind tunnel so that it generates 1 kilometer per hour winds? I'm not...

Hey guys, so for my extended essay in physics i hav came up with a topic that required me to build a wind tunel. I already have that, but then now i need to make smoke or sumthing to pass through the wind tunnel to show the wind patterns and variations. Any ideas in how to create sumthing...

Hello :) I am currently in grade 11, in Australia. I have an assignment to be completed in the wind tunnel, where we could choose any topic we liked. We also needed to write a full report on it. My lab partner and I decided to construct a rig for a discus (Sporting implement), and measure the...

I need to make a wind tunnel of plywood for testing a plate fin heat exchanger . the exhaust from the engine is fed through the Wind tunnel and then to the heat exchanger. the heat exchanger of 60 cm in length and fins of 15cm*15cm are welded over it.the temperature of exhaust is around 500'c...

How does a rocket get tested in a wind tunnel? what is it's orientation? an airplane is facing the air, like in reality, as it flies. so does that mean you mount a rocket vertically, but have the wind come on the side? or do you mount it pointing in the direction of the wind? and does...

1. Homework Statement Air at 20 degrees celsius and 100kpa is drawn into a wind tunnel. If the deflection h of a water manometer that is connected to a hole in the wall of the test section to measure the gauge pressure in the flow is 98mm. Calculate air speed in test section in m/s ignore...

Homework Statement Air at 20 degrees celsius and 100kpa is drawn into a wind tunnel. If the deflection h of a water manometer that is connected to a hole in the wall of the test section to measure the gauge pressure in the flow is 98mm. Calculate air speed in test section in m/s ignore fluid...

Homework Statement I am working on making a small wind tunnel using a 20" fan. What i want to figure out is the force generated by the movement of air. I want to make the size of the tunnel shrink to help induce more velocity in the air (see picture). Homework Equations Bernoulli's...

POWER FROM A CONVECTION LOOP: this is a scaled down version of the solar tower updraft system planned for austrailia, or the SHPEGS project with water/silica jell adsorption instead of ammonia absorption, or the water spray downdraft 'culvert on a hillside', proposed for hot dry...

I need to test a model rocket which will have average airspeeds around 200 mph. I am hoping to construct a plexiglass box about 9 feet long, 3 feet wide and 3 feet tall. For these dimensions and airspeed requirements it looks like I'd need a 160000 cfm blower. Is this something I can feasibly...

I am trying to build a low speed wind tunnel, and have a question. I understand that the contraction cone speeds up the air (proportional to the area ratio). What I am confused on is how does this "mechanical advantage" factor into sizing my fan / motor? I am planning on a tunnel with a...

Hello, Is there people amongst you who have ever dealt with Wind Tunnel testing? I cannot find a special section for experiments in this forum... I have a few topic to launch! Thanks...

I am building a small wind tunnel, and I have a few questions about it. First: The Fan I am using produces 800cfm and is 12'' in diameter, I am going to narrow it down to 6''. The calculated wind speed that I got was 74.5km/h. Can anyone back me up on this? Second: When I use scale models...

Recreating the Mythbusters' Terminal Velocity Wind Tunnel - Need advice on Manometer Hello, I am trying to find the terminal velocity of a projectile. I am placing the projectile inside a clear tube and blowing compressed air inside the tube until the projectile is hovering at some height...

Is there a (freeware?) program to calculate 3D lift and drag for simple flying bodies, e.g. ball, cylinder, cube, wing? There are programs to calculate lift and drag for foils (2D programs), e.g. javafoil of Martin Hepperle. Those programs could be used to study the flow in 2D only. E.g...