Anal wind tunnel


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Some rules are helpful: After much practice, it becomes more or less obvious which variables to pick. Mathematically, we can solve for the wind tunnel velocity, Vm, required to match Reynolds number, and we can scale up the lift measurement from the wind tunnel tests to the full scale prototype as follows: In particular, lift coefficient is plotted versus angle of attack, and several curves are plotted at constant Reynolds number. One plot is enough to completely describe the above functional relationship. For example, if there is a length, that length should be picked as a repeating variable since it is very basic and desirable in the Pi groups. Likewise, some velocity, mass, time, or density are also good choices.
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All the variables are listed and counted - The total number of variables is assigned to variable n. For example, a Pi can be raised to any exponent, including -1 which yields the inverse of the Pi. Therefore, it is important which variables are chosen. There is a wrong way and a right way to conduct the experiments.
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Description: The Pi groups are formulated by multiplying each of the remaining variables those that were not chosen as repeating variables in turn by the repeating variables, each in turn raised to some unknown exponent. Consider the airplane wing example above. The exponents are found algebraically by forcing the Pi to be dimensionless. Dynamic Similarity The principle of dynamic similarity can be stated as follows: Otherwise, it will appear in more than one Pi, which will lead to an implicit expression in Step 6 below.

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