2444 軸流ポンプ翼面上に発生するキャビテーション泡の非定常数値解析(S48-2 キャビテーション流れ(2),S48 キャビテーション流れ)  [in Japanese] 2444 Unsteady Flow Analysis of Various Cavitation Bubbles induced on An Axial Pump Blade  [in Japanese]

Cavitation flow induced on an axial pump blade is analyzed by an unsteady two-dimensional computation assuming the fluid as homogeneous dispersed mixture of liquid and vapor bubbles. A quasi-Poisson equation derived from continuity and momentum is solved by fractional step method. Bubble dynamic equation of Rayleigh-Plesset is used with a modification of void fraction terms. In order to obtain good stability in this case of rapid and high amplitude pressure change, a fine difference grid of collocated type is used. Typical cases of pump flow cavitation between low flow and high flow operations are analyzed, and in each case inception void pattern and developed pattern are presented. The results agree well with experimental observations appearing literatures.