强旋湍流气－固两相流动的颗粒随机轨道法模拟

SIMULATION OF THE STRONGLY SWIRLING GAS-PARIICLE TURBULENT FLOW BY STOCHASTIC TRAJECTORY MODEL

应用颗粒随机轨道模型，并与一种新的代数Ｒｅｙｎｏｌｄｓ应力模型相结合，对新型煤粉涡旋燃烧炉内强旋湍流气。固两相流动进行了数值模拟。得到了与实验相符合的颗粒相密度分布和质量流分布。计算结果表明，在涡旋燃烧炉内的强旋湍流流场中，外壁附近颗粒浓度最高，颗粒停留时间加长，气－固两相间滑移速度增大。

The particle stocliastic trajectory model, integrating with a new version algebraic Reynolds stress model, was employed to numerically simulate the strongly swirling gas-particle turbulent flow in a iiovel vortex combustor(VC).The calculated distributions of theparticle density and tangential mass fiux agree with the measured test data。The simulationresults elucidate the following features of the VC gas-particle flow:peak values of the particle density occurring near the combustor outer wall,prolonged particle residence time, and large gas- particle slip velocity