基于压差-刷丝厚度试验修正的刷式密封多孔介质模型  

Brush seal porous media model based on test corrections of differential pressure-brush wire thickness

作　　者：李根宏 马英群 王兴杲 张迪 赵巍[1,2,3] 赵庆军 LI Genhong;MA Yingqun;WANG Xinggao;ZHANG Di;ZHAO Wei;ZHAO Qingjun(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;School of Aeronautics and Astronautics,University of Chinese Academy of Sciences,Beijing 100049,China;Innovation Academy for Light-duty Gas Turbine,Chinese Academy of Sciences,Beijing 100190,China;Beijing Key Laboratory of Distributed Combined Cooling Heating and Power System,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;College of Energy and Power Engineering,Inner Mongolia University of Technology,Huhehaote 010080,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学航空宇航学院,北京100049 [3]中国科学院轻型动力创新研究院,北京100190 [4]中国科学院工程热物理研究所分布式冷热电联供系统北京市重点实验室,北京100190 [5]内蒙古工业大学能源与动力工程学院,呼和浩特010080

出　　处：《航空动力学报》2024年第12期354-368,共15页Journal of Aerospace Power

基　　金：国家科技重大专项(J2019-Ⅱ-0011-0031,2017-Ⅲ-0011-0037);“1912”项目。

摘　　要：建立了三级刷式密封稳态切片式三维实体管束模型和基于试验数据修正的稳态单级、三级刷式密封多孔介质模型,搭建了中速耐久刷式密封试验台,研究了单级、三级刷式密封压降对出口泄漏量的影响规律,对比分析了两种数值模型在泄漏量方面的准确性。通过试验修正的多孔介质方法研究了三级刷式密封在不同压差工况下的封严泄漏特性,分析了三级刷式密封中每一级刷丝束内部轴向与径向在不同表面的压力分布特性。研究结果表明:基于试验数据修正的多孔介质模型比稳态切片式三维实体模型管束求解精度显著提高,单级、三级多孔介质模型修正后的数值与试验结果误差分别小于5%、20%。刷丝束围栏高度及周围区域存在较大的轴向与径向压力梯度,通过流阻效应达到良好的密封效果。A steady-state clip type three-dimensional solid model of the three-stage brush seal and a porous media model of the single-stage brush seal and three-stage brush seal based on the test data modification were established,a brush seal leakage medium-speed durable characteristic experiment device was designed and built,the influence of pressure drop on leakage characteristics of single-stage and three-stage brush seals was studied,and the advantages and disadvantages of the two numerical methods were analyzed and compared.The modified porous media model was used to study the flow field characteristics of the three-stage brush seal,and the axial and radial pressure distribution characteristics inside the brush bundle were analyzed.The results showed that the porous media model modified based on experimental data had higher solution accuracy than the steady-state three-dimensional forked tube bundle model and was closer to the experimental results,the error between the corrected values and the test results of single-stage and three-stage porous media models was less than 5%and 20%,respectively,which was in good agreement with the experimental results.There were large axial and radial pressure gradients in the height and surrounding area of the brush wire bundle fence,and good sealing effect was achieved through the flow resistance effect.

关 键 词：三级刷式密封 稳态切片式三维实体管束模型 多孔介质模型 泄漏特性 压力分布 

分 类 号：V233.5[航空宇航科学与技术—航空宇航推进理论与工程]