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采用GERG-2004方程构建了4种RP-3航空燃油的物理替代模型,并给出其主要物性参数,基于雷诺时均方法(RANS)对室温下(298K)航空燃油绕Clark-Y型水翼非定常空化流动进行了数值计算研究,并与同温度下水体空化进行了比较。研究结果表明,由45%正十二烷,25%正十烷,5%辛烷,5%甲基环己烷和20%甲苯(摩尔比)组成的替代模型能够较好拟合RP-3的物质属性,可用来替代RP-3进行空化流动计算。在相同雷诺数下,RP-3较水体更容易发生空化,其初生空化数为2.5。两种流体介质空化的非定常特征基本相同,RP-3空化更为显著,空穴内部含汽量更高,在云状空化阶段(Re=7×105,σ∞=0.8),空化流动非定常准周期变化频率对应的斯特劳哈尔数St小于水体。
Based on the GERG-2004 equation, four RP-3 aviation fuel physical replacement models were constructed and their main physical parameters were given. Based on the Reynolds averaged time (RANS) The unsteady cavitation flow is numerically studied and compared with the cavitation at the same temperature. The results show that RP-3 can be fit well to the substitution model consisting of 45% n-dodecane, 25% n-decane, 5% octane, 5% methylcyclohexane and 20% toluene The material properties that can be used to replace RP-3 for cavitation flow calculations. Under the same Reynolds number, RP-3 is more prone to cavitation than water body, and the number of primary cavitation is 2.5. The unsteady characteristics of cavitation of the two fluid media are basically the same, the cavitation of RP-3 is more significant and the content of vapor in the cavity is higher. In the cloud-like cavitation stage (Re = 7 × 105, σ∞ = 0.8) The unsteady quasi-periodic change frequency of cavitation flow corresponds to the Strouhal number St smaller than the water body.