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STAGNATION POINT FLUCTUATIONS ON BODIES OF REVOLUTION WITH HEMISPHERICAL NOSES
MICHIGAN UNIV ANN ARBOR
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The turbulent fields outside of the boundary layer near the noses of axially symmetric bodies with hemispherical noses were studied by means of the hot-wire anemometer. Measurements in a low turbulence wind tunnel over a range of Reynolds numbers show that the rms streamwise fluctuations in the nose region are larger than in the free stream. Large negative spatial correlation factors between streamwise fluctuations at plus or minus 7 deg from the axis at low speeds and in a supersonic tunnel at Mach 2.45 indicate that the fluctuations in the nose region are coupled with a random motion of the stagnation point. The normalized energy spectra of the fluctuations at 7 deg are found to scale with the free stream wave number. These normalized spectra also show a shift toward lower frequencies compared with free stream turbulence. Possible connection between these phenomena and heat transfer measurements from bodies as affected by turbulence are pointed out. Author
APPROVED FOR PUBLIC RELEASE