抑扰型刷式密封刷丝浮升效应流固耦合数值分析  

Numerical investigation on bristles buoyancy effect of suppresseddisturbance brush seals with fluid-structure interaction

作　　者：孙基生 孙丹 赵欢 慕伟 任国哲 徐文峰 SUN Jisheng;SUN Dan;ZHAO Huan;MU Wei;REN Guozhe;XU Wenfeng(Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System,School of Aero-engine,Shenyang Aerospace University,Shenyang 110136,China;Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110015,China;Key Laboratory of Power Transmission Technology on Aero-engine,Aero Engine Corporation of China,Shenyang 110115,China)

机构地区：[1]沈阳航空航天大学航空发动机学院,辽宁省航空宇航推进系统先进测试技术重点实验室,沈阳110136 [2]中国航发沈阳发动机研究所,沈阳110015 [3]中国航空发动机集团有限公司航空发动机动力传输重点实验室,沈阳110015

出　　处：《航空动力学报》2024年第10期121-130,共10页Journal of Aerospace Power

基　　金：国家自然科学基金(52075346);先进航空动力创新工作站(依托中国航空发动机研究院设立)项目(HKC2020-02-030);辽宁省教育厅基础研究项目(JYT2020047)。

摘　　要：提出抑扰型刷式密封结构,基于arbitrary Lagrange-Eulerian(ALE)流固耦合方法建立抑扰型刷式密封刷丝浮升效应三维瞬态求解模型,研究不同抑扰孔结构刷式密封泄漏特性和速度特性,以及抑扰孔结构参数对刷式密封刷丝浮升效应的影响规律。研究结果表明:在传统刷式密封前挡板设置抑扰孔可改变前排刷丝受力状态,前排刷丝受到与扰动方向相反的力矩,有效抑制刷丝浮升效应产生,显著提升传统刷式密封封严性能。相较于易产生刷丝浮升效应的传统刷式密封,降低抑扰孔高度、增加抑扰孔直径和排数,均可有效降低刷式密封泄漏量,其中增加抑扰孔排数至3排可降低30.2%泄漏量。设置抑扰孔结构可抑制刷丝浮升效应引起的前排刷丝形变,相比于传统刷式密封,抑扰孔高度设置为3.75 mm、抑扰孔直径设置为1.5 mm与抑扰孔排数设置为3排,分别使刷丝自由端平均变形量减少53.2%、34.8%和54.0%。Suppressed-disturbance(SD)brush seal structure was presented.A three-dimensional transient solution model for bristles buoyancy effect of the brush seal with disturbance suppression was established based on arbitrary Lagrange-Eulerian(ALE)fluid-structure coupling method.The leakage characteristics and velocity characteristics of the brush seal with different SD hole structures were studied,and the influence of the structural parameters of SD holes on bristles buoyancy effect of brush seal was studied.The results showed that the SD hole in the front plate of the traditional brush seal can change the stress state of the front bristles,and the front bristles were subjected to a torque opposite to the direction of disturbance,effectively inhibiting the bristles buoyancy effect,and significantly improving the sealing performance of the traditional brush seal.Compared with the traditional brush seal prone to produce the bristles buoyancy effect,reducing the height of the SD hole and increasing the diameter and number of the SD hole can effectively reduce the leakage of the brush seal.Increasing the number of rows of SD hole to 3 rows can reduce the leakage of brush seal by 30.2%.The setting of the SD hole structure can inhibit the deformation of the front bristles caused by the bristles buoyancy effect.Compared with the traditional brush seal,the height of the SD hole was set to 3.75 mm,the diameter of the SD hole was set to 1.5 mm,and the number of rows of the SD hole was set to 3 rows,which reduced the average deformation of the free end of the brush by 53.2%,34.8%and 54.0%.

关 键 词：抑扰型刷式密封 刷丝浮升效应 arbitrary Lagrange-Eulerian方法 流固耦合 数值分析 

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]