1612 翼列のキャビテーション流れにおける熱力学的効果の数値解析(S33-1 ポンプ・キャビテーション,S33 流体機械の諸問題)

概要

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Thermodynamic effect in cavitation is desirable effect which acts to suppress growth of cavitation. That occurs when liquid phase evaporates, liquid temperature decreases by latent heat of vaporization, and then saturated vapor pressure decreases. The effect is less well understood associated with cavitation instabilities. In this study, numerical method which can express interchange of latent heat between liquid and gas phase is proposed. In the present method, thermal nonequilibrium condition between liquid and gas temperatures is taken into account. At this time, macroscopic cavitation flowfield is calculated by using local equilibrium medium model. By using the present numerical method, unsteady cavitation in three-blade cascade with water is performed. Distributions of phase change area and decrease of saturated vapor pressure are analyzed, cavity volumes is compared between room temperature and hot water.
社団法人日本機械学会の論文
2007-09-07