气固两相旋流中气粒两相流场特性数值模拟

Numerical investigation on characteristics of gas solid flow in two phase rotary flow

以气固旋流分离器为研究对象 ,对气相采用κ-ε模型及代数应力模型 ,对颗粒相应用随机轨道模型 ,并考虑相间耦合的相互作用 ,建立了描述气固两相旋流中气粒两相流场特性数学模型 ,同时 ,应用 SIMPLEC方法 ,成功地进行了气固两相旋流中气粒两相流场特性数值模拟。结果表明 :在内锥体顶部上方易形成旋涡 ;分离器靠外壁处气流为上升流 ,且偏向出口 ;在分离器中心区域存在回流 ,越靠近底部 ,回流越明显 ;尘粒初始位置越靠近分离器入口断面底部与分离器外侧越易到达分离器底部 ;在相同初始条件下 ,较大粒径尘粒易于到达分离器底部 ,较小粒径尘粒则先向分离器底部运动 ,后又向分离器顶部运动 ,从而可能从分离器出口跑出 ,或在分离器中某一位置不停旋转。

Based on analyzing the rotary flow separator, and coupling reciprocity between different phase, the 3-D matwo-fluid model thematical models on gas-solid phase flow characteristics in gas-solid two phase rotary flow are developed. Numerical simulation is carried out successfully using the SIMPLEC scheme. The results show that:(1) Vertex is easily formed at the top region of the inner cone; (2) On up wide flow leans to the exit of the separator is existed near the separator wall; (3) There exists a reverse flow region in the center part of the separator, and the reverse flow is stronger towards the bottom of the separator; (4) Initial position of the particle, at the entrance of the separator, the diameters of particles play an important vole in the flow path and the final position of the particles.