高エンタルピー衝撃風洞の熱負荷に関する基礎検討 : 第3報, 熱防御材の耐熱限界による風洞運転範囲の検討

概要

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A numerical flow analysis method combined with a heat conduction analysis of the shock tube wall was presented in the first report. Results from thermal protection testing which was carried out at a 25 MJ/kg stagnation enthalpy using the high enthalpy shock tunnel T5 of the California Institute of Technology and results from the surface temperature analysis were presented in second report. Though the present analysis method will be able to predict flow conditions and temperature rises of the wall for an individual tunnel operation condition, it is necessary to know the limitation of thermal protection for the whole range of tunnel operation conditions. An equation, which shows the relationship between flow condition in the downstream region of the shock tube and the surface temperature of the tube, is deduced from the analytical solution of the unsteady heat conduction equation. This equation is simplified by using an approximation of the thermodynamic state which influences heat transfer of the stagnation region directly. The limitation curves calculated by this simple equation show good qualitative agreement with the experimental results. This simple equation also shows effects of apparatus scale and material on the limitation of thermal protection.
社団法人日本機械学会の論文
1999-02-25