摘要
针对本文模型复杂的后口环回流系统,提出一种轴承模型简化方法。基于SIMPLEC算法,采用雷诺时均Navier-Stokes方程和RNG k-ε湍流模型,对采用轴承简化模型的一台高速泵(38 500 r/min)进行全流场三维湍流数值模拟,对比试验数据,证明该方法在工程实际中具有可行性。在上述基础上,对不同后口环间隙的模型进行模拟,分析各种情况下泵的外特性及内部流动变化,结果表明后口环间隙变化对泵的外特性影响明显,后口环泄漏量受口环间隙尺寸的影响较大,与口环间隙尺寸大致呈线性变化。研究还发现后口环间隙的增大对后泵腔内的流动状况有着改善作用,使后泵腔内的漩涡区减小,流动更为顺畅。
As for the complex rear wear - ring return - flow system, a method is proposed to simplify bearing model. The method was applied and based on the simplified model, the flowing of three -dimensional turbulent in a high -speed pump （38500r/rain） was computed by using the time - averaged Navier - Stokes equation and the SIMPLEC algorithm. The result shows that this method is fea- sible in engineering practice. On this basic, the models with different rear wear - ring clearance were simulated. The external charac- teristic and the fluid flow of the pump under all circumstances were analyzed. Research shows that the rear wear - ring influences the external characteristic of the pump obviously. The leakage of rear wear - ring is great influenced by the size of wear - ring, and is roughly linear relationship with the clearance size. The increase of clearance of rear wear - ring can improve the flow state in rear cavity and decrease the vortex region, and smooth the flow.
作者
杨从新
刘洋
安莎
徐楠
刘军年
YANG Congxin LIU Yang AN Sha XU Nan LIU Junnian(School of Energy and Power Engineering,Lanzhou Univ. of Tech. ,Lanzhou 730050 China Xi＇ an Aerospace Propulsion Institute,Xi＇ an 710100 China)
出处
《西华大学学报（自然科学版）》
CAS
2017年第2期1-5,共5页
Journal of Xihua University:Natural Science Edition
基金
中国航天科技集团公司支撑项目(2011TY09)
关键词
轴承简化模型
后口环间隙
高速泵
全流场
数值计算
simplified bearing model
rear wear - ring clearance
high - speed pump
whole flow filed
numerical calculation
