Problem of dynamic stall simulation revisited

Simulating dynamic stall characteristics in subscale wind-tunnel tests often presents an insolvable problem. At stall the peak velocity on the airfoil is several times larger than the freestream velocity, causing compressibility effects to be unusually large. Consequently, simulation requires testing at the full-scale Mach number and Reynolds number, a capability beyond the means of most test facilities. An additional problem is presented by wall interference in so-called two-dimensional dynamic stall tests. Subscale test results are examined against this background of simulation problems.

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