气固喷射器内气固两相流动三维数值模拟

THREE-DIMENSIONAL NUMERICAL SIMULATION ON GAS-SOLID TWO-PHASE FLOWS IN GAS-SOLID INJECTOR

利用拉格朗日和欧拉法相结合的三维数值模拟技术,对收缩型气固喷射器内的气固两相流动进行数值模拟研究。该文的数值模型考虑了气固两相的双向耦合作用以及颗粒碰撞。在他人研究结果的基础上,分析推导出密相气固两相流中固体颗粒运动动能与携带流体的动能之间的新的转换关联式。文中通过对气固喷射器内气固两相流流动的模拟计算,发现驱动气体在喷射器中心会形成一相对“稳定”的射流区域,而固体颗粒也存在积聚区,针对喷射器内存在固体颗粒堆积现象,本文对气固喷射器的结构设计提出了相应的改进措施。

By using three-dimensional numerical simulation technique together with the Lagrangian and Eulerian methods, a numerical simulation research of the gas-solid phase flows within the convergent gas-solid injector was performed firstly in this paper. In this numerical model, the gas-solid two-way coupling effects and inter-particle collisions are taken into account. Based on previous researchers＇ results, a new correlation, which represents the transfer of kinetic energy of the particle motion to kinetic energy of the carder fluid in the dense gas-solid flows, is deduced in the present study. Depending on the calculated results of gas-solid flow in the convergent gas-solid injector, it is found that the driving gas can bring a relatively steady jet region in the center of the gas-solid injector and many particles are accumulated in a certain region. According to this solid accumulation phenomenon, this present paper proposes an improved measure for the physical design of the convergent gas-solid injector.