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在蒸汽强化换热试验研究的基础上,采用SSG雷诺应力模型,通过数值方法求解了三维定常雷诺时均Navier-Stokes方程,同时系统地分析了雷诺数、温度和压力对蒸汽在90°矩形带肋通道中流动和换热的影响.结果表明:温度和压力的变化强烈地影响着带肋通道中蒸汽的强化换热特性,蒸汽的摩擦因子和换热系数随着温度的升高而减小,随着压力的升高而增大,在适中的Re、较低的蒸汽温度和中等压力下,蒸汽流动可以获得最佳的强化换热性能;蒸汽和空气的换热系数比与温度和压力有关,但与Re无关.
Based on the experimental study of steam-enhanced heat transfer, the three-dimensional steady-state Reynolds-averaged Navier-Stokes equations are solved numerically using the SSG Reynolds stress model. The effects of Reynolds number, temperature and pressure on the three- The results show that the changes of temperature and pressure strongly affect the enhanced heat transfer characteristics of the steam in the ribbed channel. The friction coefficient and heat transfer coefficient of steam decrease with the increase of temperature , And increases with the increase of pressure. At moderate Re, lower steam temperature and medium pressure, steam flow can obtain the best enhanced heat transfer performance; the ratio of heat transfer coefficient of steam and air to temperature and pressure Related, but has nothing to do with Re.