摘要
针对刷丝与转子摩擦生热、刷束的局部过热、热量传入轴承腔体等影响机器性能的问题,对柔性丝刷式密封的生热、散热、隔热性能进行了研究。建立了大过盈变阻力柔性丝刷式密封和传统金属丝刷式密封CFD多孔介质数值模型,对比了柔性丝和金属丝刷式密封摩擦生热性能、沿挡板的传热性能、阻碍热量进入轴承腔体的隔热性能,并探究了工况参数和结构参数对刷封隔热性能的影响规律;开展了柔性丝刷式密封摩擦力测量试验和摩擦生热试验。研究结果表明:碳纤维刷式密封摩擦生热较低,沿挡板散热效率较高,对轴承腔的隔热性能较好;增大压差和温度,出口热流量升高,不同转速区间对热流量影响不同,通过增大刷束厚度、降低前、后板间隙会提高隔热性能;试验和数值结果吻合良好,误差为9.4%。
Aiming at the problems of the machine performance which was affected by the friction heat generation, the local overheating of the bristle pack, and the heat transfered into the bearing cavity;the heat generation, heat dissipation and heat insulation performance of flexible bristle brush seal were investigated. Numerical models of large interference flexible bristle brush seal and classic metal bristle brush seal were established for CFD porous media, the friction heat generation performance, the heat transfer performance along the plate, and the heat insulation performance of preventing heat from entering the bearing cavity were analyzed. The influence of working condition parameters and structure parameters on the heat-insulation performance was explored, the frictional force and frictional heat generation of flexible bristle brush seal were tested. The results indicate that friction heat generation of carbon fiber brush seal is lower, heat transfer efficiency of carbon fiber bristles and plate is higher, heat insulation performance of carbon fiber brush seal is better. Heat flow increases under the conditions of large pressure difference and high temperature, different speed ranges have different effects on heat flow, increasing the bristles pack thickness or decreasing the front and back plate clearance can improve the heat insulation performance. The experimental results are in good agreement with the numerical results, with an error of 9.4%.
作者
李双喜
马钰虎
张山雨
沙廉翔
陈坤毅
廖浩然
LI Shuang-xi;MA Yu-hu;ZHANG Shan-yu;SHA Lian-xiang;CHEN Kun-yi;LIAO Hao-ran(School of Electrical and Mechanical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;China Aerospace Standardization Research Institute,Beijing 100071,China)
出处
《机电工程》
CAS
北大核心
2021年第2期133-141,共9页
Journal of Mechanical & Electrical Engineering
基金
国家重点研发计划项目(2018YFB2000800)。
关键词
柔性丝刷式密封
传热特性
数值分析
试验研究
flexible bristle brush seal
heat transfer characteristics
numerical analysis
experimental investigation
