双尺度二阶矩颗粒相湍流模型经验系数的影响

基金项目: 中国博士后科学基金资助项目(2004036239)

Effect of Empirical Coefficients on Simulation in Two-Scale Second-Order Moment Particle-Phase Turbulence Model

College of Astronautics, Northwestern Polytechnical University, Xi'an 710072, P. R. China;

摘要: 基于将颗粒脉动分成湍流引起的大尺度脉动和颗粒间碰撞产生的小尺度脉动的概念，建立了双尺度二阶矩两相湍流模型．用该模型对下行床内两相流动进行了数值模拟，颗粒体积浓度、平均速度的计算结果和实验数据吻合较好．分析了双尺度二阶矩两相湍流模型经验系数变化对预报结果的影响：在经验系数的一定变化范围内，预报结果并无明显的影响，但是变化范围增大，预报结果会产生较大变化．
- 两相流动 /
- 二阶矩模型 /
- 双尺度脉动 /
- 经验系数
Abstract: A two-scale second-order moment two-phase turbulence model accounting for inter-particle collision was developed,based on the concept of particle large-scale fluctuation due to turbulence and particle small-scale fluctuation due to collision.The proposed model was used to simulate gas-particle downer reactor flows.The simulation results of particle volume fraction and mean velocity are in agreement with the experimental results.The sensitivity of the model prediction to variations in the values for the model constants is investigated,overall,the predictions do not reveal a large sensitivity to the values constants in the downer reactor,but a relatively great change of the constants has important effect on the prediction.
- two-phase flow /
- second-order moment model /
- two-scale fluctuation /
- empirical coefficient

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