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May 12, 2016, 08:13 |
Obtaining wind tunnel similarity issue
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Senior Member
Stuart
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 735
Rep Power: 25 |
Hi,
It's well known that non-dimensional parameters should match between a model (e.g. in a wind tunnel or water tank) and the full scale application. Which non-dimensional parameters are considered is dependent upon the scenario. I have a compressible aerodynamics test to conduct on a model but due to the equipment I cannot get the model to full scale similarity for both the Mach number and the Reynolds number. So I have to choose only one of those, either or , and let the other not match. The question is which one to match. Since the goal of the test is to determine the rotation of an object which is driven by the airflow I am favoring the Reynolds number, since that is the ratio of inertial to viscous forces. Therefore, my test Mach number will not match the full scale application Mach number. I'd appreciate any comments if this is right or wrong. Thanks. |
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