簡略化熱モデルを用いた水素・窒素キャビテーションの数値解析による修正熱力学的パラメータの提案

抄録

In this study, unsteady numerical analysis was done for cavitation in liquid hydrogen and nitrogen where thermodynamic self-suppression effect appears. The distribution of turbulent thermal diffusivity was estimated along the cavity surface. Then, it was shown that the turbulent thermal diffusivity coefficient has order of 103, it means that the turbulence has strong influence on the thermal diffusivity around the cavity surface region. Additionally, the scaling law of the averaged turbulent diffusivity coefficient on Reynolds number was obtained from the numerical results. Finally, the turbulent thermodynamic parameter was suggested which was derived by taking account of turbulent effect on thermal diffusivity and the scaling law into the nondimensional thermodynamic parameter and that was validated using the present numerical results.