境界層強制遷移に伴う臨界レイノルズ数前後の球に作用する支持干渉の無い空気力について

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  • About support-interference-free aerodynamic force acting on a sphere with boundary layer trip around its critical Reynolds number

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Through advanced detail simulation tests, adjusting model mass and control factors made successful measurement of aerodynamic force on a sphere at Reynolds numbers around critical one at the JAXA 60 cm magnetic suspension and balance system. The obtained averaged aerodynamic force for 8 seconds shows that the minimum drag coefficient after the critical Reynolds number reaches 0.062 and that any hysteresis phenomenon on drag coefficient with respect to Reynolds number was not observed around the critical one. Through the obtained fluctuations of aerodynamic force, the shrunk force fluctuating around the sphere axis parallel to main flow and some force swirling the sphere about the axis for a short time were observed at Reynolds numbers larger than the critical one. And some oscillating force on a plane including the axis was observed in the test of a sphere with double tapes for boundary layer trip in large Reynolds number region around the critical one.

資料番号: AA0063742005

レポート番号: JAXA-SP-07-016

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