why do we need Reynolds number for wind tunnel?

410552457 · November 22, 2014, 03:23

Hi,

you know, when we use the wind tunnel, we first should know its Running Mach
number and Reynolds number, which are used to compare the experimental data and real data of flight. But i do not know which property the Reynolds number influence eventually, the turbulence intensity or viscosity ?

Bazinga · November 23, 2014, 05:08

The Reynolds number compares the mass effects of the flow to the friction effects of the flow. Because of scaling you are not be able to reproduce the same RE in the wind tunnel so you need to check the RE in the wind tunnel, so that the main flow phenomena around your body are the same.

November 22, 2014, 03:23	why do we need Reynolds number for wind tunnel?	#1
410552457 New Member Nicolas Guo Join Date: Nov 2014 Posts: 3 Rep Power: 11	Hi, you know, when we use the wind tunnel, we first should know its Running Mach number and Reynolds number, which are used to compare the experimental data and real data of flight. But i do not know which property the Reynolds number influence eventually, the turbulence intensity or viscosity ?

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November 23, 2014, 05:08		#2
Bazinga Senior Member Join Date: Jun 2012 Location: Germany, Bochum Posts: 230 Rep Power: 15	The Reynolds number compares the mass effects of the flow to the friction effects of the flow. Because of scaling you are not be able to reproduce the same RE in the wind tunnel so you need to check the RE in the wind tunnel, so that the main flow phenomena around your body are the same.