航空发动机篦齿流动熵产分析及系统低熵产篦齿构造  

Analysis of flow entropy generation in aero-engine grate and construction of low entropy generation grate

作　　者：刘晓静[1,3] 丁水汀[2] 邱天 刘传凯[3] 李果[1] 赵志高[4] LIU Xiaojing;DING Shuiting;QIU Tian;LIU Chuankai;LI Guo;ZHAO Zhigao(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;Civil Aviation University of China,Tianjin 300300,China;Research Institute of Aero-Engine,Beihang University,Beijing 100191,China;The Fourth Departments of Technical Research,Chinese Aeronautical Establishment,Beijing 100012,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]中国民航大学,天津300300 [3]北京航空航天大学航空发动机研究院,北京100191 [4]中国航空研究院技术研究四部,北京100012

出　　处：《航空动力学报》2023年第9期2107-2115,共9页Journal of Aerospace Power

摘　　要：建立篦齿熵产分析的数值模拟方法并经试验验证方法的准确性,进而揭示了台阶式篦齿的倾角、齿顶宽度、齿高、台阶高度变化下的流动熵产机理及导致熵产的主要流动特征。在此基础上最终从系统熵产视角对篦齿进行优化和特性分析。结果表明:篦齿齿顶区域相对耗散强度较大,导致该区域存在的齿顶涡具有较强增阻作用,对于提升篦齿局部熵产,降低系统熵产有重要作用。通过主动构造齿顶涡(增阻涡)可以实现增强篦齿局部熵产、减小泄漏量的设计目标。优化后的台阶式篦齿结构较初始台阶齿的封严性能提升24%。The numerical simulation method of grate entropy generation analysis was established,and the accuracy of the method was verified by tests.Then,the flow entropy generation mechanism and the main flow characteristics leading to entropy generation under the changes of inclination angle,tooth top width,tooth height and step height of stepped grate were revealed.On this basis,the grate was optimized and analyzed from the perspective of system entropy generation.The results showed that the relative dissipation intensity in the top region of the grate was large,resulting in strong drag increasing effect of the top vortex in this region,and contributing a lot to improving the local entropy generation of the grate and reducing the system entropy generation.The design goal of enhancing the local entropy generation of the grate and reducing the leakage can be achieved by actively constructing the tooth top vortex(drag increasing vortex);the sealing performance of the optimized stepped grate structure was 24%higher than that of the initial stepped teeth.

关 键 词：篦齿 熵产 增阻涡 构型 封严性能 

分 类 号：V232.3[航空宇航科学与技术—航空宇航推进理论与工程]