Recent Development in Flow Separation.

Chang, Pyung Hun

doi:10.21236/ada099165

Cited by 2 publications

References 33 publications

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Investigation of tangential blowing applied to a subsonic V/STOL inlet

Burley

Hwang

1983

Journal of Aircraft

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Engine inlets for subsonic V/STOL aircraft must operate over a wide range of conditions without internal flow separation. An experimental and an analytical investigation were conducted to evaluate the effectiveness of tangential blowing to maintain attached flow to high angles of attack. The inlet had a relatively thin lip with a blowing slot located either on the lip or in the diffuser. The height and width of these slots were varied. Experimentally determined flow separation boundaries showed that lip blowing achieved higher angle-of-attack capability than diffuser blowing. This capability was achieved with the largest slot circumferential extent and either of the two slot heights. Predicted (analytical) separation boundaries showed good agreement except at the highest angles of attack. xlO 4 Nomenclature A = area CR = contraction ratio D = diameter h = blowing slot height L -inlet length m = mass flow rate P = total pressure p = static pressure , 'R = Reynolds number m R [/Pa \ (T-//T) "1 RBP = relative blowing power,--( --) -1\ fflf L.\PQ / J T = total temperature V.= velocity x = axial length from inlet highlight y = rake height 7 = ratio of specific heats 6 = blowing slot circumferential extent = viscosity p = density \l/-= circumferential location Subscripts B = blowing d = diffuser rake de = diffuser exit e^ = edge of boundary layer F -fan face HL = highlight / = inlet max .= maximum 0 -freestream t = throat

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