Design the angle of windtunnel

In summary, a well designed wind tunnel will generally have the test section expand slowly (maybe only a degree or so) and this is to account for the boundary layer growth. As the boundary layer thickens it essentially decreases the cross-sectional area of the tunnel. The flow outside the boundary layer will then speed up (conservation of mass) and this creates a pressure gradient that can increase the drag on your model. In order to properly set this angle you need to estimate the thickness of your boundary layer. As for the diffuser section, the angle should be kept as small as possible to avoid separation off of the walls. Disturbances due to the separated flow in the diffuser can propagate upstream
  • #1
eyzaa
3
0
hi.
i would like to ask how to design the angle of wind tunnel and what need to be consider and the effect.i need to do it this case study for my thesis. and where i can get related journal?

anyway thnks.
i really hope someone can help me.
 
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  • #2
What angle are you talking about?
 
  • #3
from the contraction to test section and to diffuser.
mostly use 5degree.why?
 
  • #4
I am still not exactly sure what you are referring to.

A well designed wind tunnel will generally have the test section expand slowly (maybe only a degree or so) and this is to account for the boundary layer growth. As the boundary layer thickens it essentially decreases the cross-sectional area of the tunnel. The flow outside the boundary layer will then speed up (conservation of mass) and this creates a pressure gradient that can increase the drag on your model. In order to properly set this angle you need to estimate the thickness of your boundary layer.

As for the diffuser section, the angle should be kept as small as possible to avoid separation off of the walls. Disturbances due to the separated flow in the diffuser can propagate upstream into the test section. In addition to this, the separated flow can decrease the performance of your wind tunnel. There are methods for estimating the angle at which your flow will separate. Usually the angle of the diffuser is set by knowing the pressure recovery you want to achieve and the amount of space you have for your tunnel.
 
  • #5
thank you.it totally help me of this problem.
i also like to know why there are circular wind tunnel and rectangular wind tunnel?what the different between it?
and how to calculate the angle by having a pressure that we want?
 

Related to Design the angle of windtunnel

What is the purpose of designing the angle of a windtunnel?

The purpose of designing the angle of a windtunnel is to create a controlled airflow that simulates the conditions of real-world scenarios. This allows scientists to test and analyze the performance of different objects or structures in various wind conditions.

How do you determine the appropriate angle for a windtunnel?

The appropriate angle for a windtunnel is determined by considering the intended use of the windtunnel and the desired testing conditions. Factors such as the shape and size of the object being tested, the wind speed and direction, and the desired outcome of the test are all taken into account when determining the angle of the windtunnel.

What are the benefits of varying the angle in a windtunnel?

Varying the angle in a windtunnel can provide valuable data on how an object or structure behaves in different wind conditions. This allows for a more comprehensive understanding of its performance and can help in optimizing its design for real-world use.

Are there any limitations to designing the angle of a windtunnel?

Yes, there are limitations to designing the angle of a windtunnel. The size and shape of the windtunnel, as well as the available resources and budget, may limit the range of angles that can be tested. Additionally, the accuracy of the results may also be affected by factors such as turbulence and boundary layer effects.

What are some common methods used to design the angle of a windtunnel?

Some common methods used to design the angle of a windtunnel include computational fluid dynamics (CFD) simulations, wind tunnel testing, and theoretical calculations based on fluid dynamics principles. Each method has its own advantages and disadvantages, and the most appropriate method may vary depending on the specific needs and constraints of the project.

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