Injection-Induced Turbulence in strongStagnationstrong-Point Boundary.pdfVIP

Injection-Induced Turbulence in strongStagnationstrong-Point Boundary.pdf

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VOL. 22, NO. 2, FEBRUARY 1984 AIAA JOURNAL 219 Injection-Induced Turbulence in Stagnation-Point Boundary Layers Chul Park * NASA Ames Research Center, Moffett Field, California A theory is developed for the stagnation-point boundary layer with injection under the hypothesis that tur- bulence is produced at the wall by injection. From the existing experimental heat-transfer-rate data obtained in wind tunnels, the wall mixing length is deduced to be a product of a time constant and an injection velocity. The theory reproduces the observed increase in heat-transfer rates at high injection rates. For graphite and carbon- carbon composite, the time constant is determined to be 2 x 10 ~ 4 s from the existing ablation data taken in an arc-jet tunnel and a ballistic range. Nomenclature Introduction B0 = blowing parameter referred to zero injection HE role of turbulence in the boundary-layer flows at the C Tstagnation point of a blunt body is one of the most Cd turbulence dissipation coefficient, Eq. ( 1 1) interesting subjects in fluid mechanics . The classical boun- CM eddy-viscosity coefficient, Eq. (3)

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