摘要
在贴体曲线坐标系下 ,应用同位网格上求解压力耦合方程的半隐算法 (SIMPLEC) ,对叶顶间隙泄漏时的离心式压气机模型级内部的流动进行了数值模拟 .采用速度的协变物理分量作为求解变量 ,在同位网格上对离散单元体的界面流通量做了特殊动量插值 ,来抑制不合理的压力场振荡 ,并计算模拟了叶轮顶端间隙泄漏流动随主流的输运和扩散过程 .计算结果表明 ,叶顶间隙泄漏不仅严重影响叶轮内部的流动结构和性能 ,而且显著恶化了无叶扩压器和整个模型级内部的流动和性能 .因此 。
Using the technique of collocated grid, coupled with standard k-Ε turbulence model, a pressure correction algorithm for a general curvilinear system is adopted to study the complex tip leakage flow in a centrifugal compressor stage model. The velocity components along axes of curvilinear coordinates are selected as solving variables. A specific scheme, which can suppress the unreasonable pressure oscillation, is employed for getting the flux through the surface of control volumes by interpolation. The computation simulated the transportation and diffusion process of the tip leakage flow through the channel of the model stage. The results show that the tip leakage flow not only obviously changes the flow structure and performance of the impeller, but also deteriorates the flow condition and performance of the whole stage.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2001年第9期908-913,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目 ( 5 98760 2 8)
