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提出并建立了基于可变时间间隔平均方法的多尺度两相湍流模型,通过算例验证,证实了所推导的气液两相多尺度数学模型、所标定的模化参数及描述气液两相作用机理的合理性,及其计算的时间平均阻力系数、脉动升力系数误差、斯特劳哈尔数和回流区大小误差分别为1.45%,0.323%,2.17%,2.33%,计算结果明显优于标准k-ε和重整化群(RNG)k-ε模型.用多尺度湍流模型对气液两相绕流6个不同的钝体稳燃器进行数值计算表明:船形与锥形是综合性能较优的两个钝体稳燃器结构.其中,船形钝体比锥形钝体稳燃器回流区大10.53%,其时间平均阻力系数比锥形稳燃器大4.776%,方均根脉动升力系数比锥形稳燃器小44.73%,通过全方面综合比较,船形是综合性能最优的钝体稳燃器结构.
A multi-scale and two-phase turbulence model based on the variable time interval averaging method is proposed and established. The calculated multi-scale two-phase turbulence model is verified by numerical examples. The multi-scale mathematical model of gas-liquid two- The rationality of the mechanism of action, the calculated average time drag coefficient, the error of pulsating lift coefficient, the Strouhal number and the size of the recirculation zone are 1.45%, 0.323%, 2.17% and 2.33%, respectively. Standard k-ε and renormalization group (RNG) k-ε model.The multi-scale turbulence model is used to calculate the flow field of six different bluff body gas-liquid two-phase flow stabilizer shows that: the shape of the ship and the cone is a comprehensive performance The structure of bluff body with bluff body is 10.53% larger than that of blunt body with blunt body, and its average time drag coefficient is 4.776% larger than that of conical burner, and the root mean square pulsating lift coefficient 44.73% smaller than the tapered burner, through comprehensive comparison of all aspects, the shape of the boat is the best overall performance bluff body structure.