对转涡轮盘腔内流动结构转换机理及传热特性的研究

项目名称： 对转涡轮盘腔内流动结构转换机理及传热特性的研究

项目编号： No.51306201

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 陈淑仙

作者单位： 中国民用航空飞行学院

项目金额： 25万元

中文摘要： 对转涡轮因为其突出的优点已成为高性能燃气涡轮技术发展的前沿研究方向之一。由于对转涡轮盘腔内流动和换热的复杂性，至今仍有大量问题不甚清楚，尚需进一步深入的研究。本项目通过对对转盘腔内哥氏力等旋转附加力耦合作用对盘面边界层内流动和核心区双涡二次流的影响、旋转附加力对低速盘上滞止点和核心区自由剪切层形成的影响、自由剪切层不稳定性的实验和数值研究，阐明Stewartson型和Batchelor型流动结构的形成机理，揭示Stewartson型和Batchelor型两种流动结构之间的转换机制，探明对转涡轮盘腔内流动相对于转静系由层流向紊流提前转换的原因，并阐释流动结构转换对盘面努塞尔数、力矩系数及盘腔内压力的影响及其机理。综合分析后提出强化对转涡轮盘腔内换热和密封效果的措施，达到延长涡轮盘疲劳寿命、提高发动机性能的目的。

中文关键词： 对转盘腔；流动结构；形成机理；旋转力；换热特性

英文摘要： Contra-rotating turbine has already become one of the frontier research of high performance gas turbine technique because of its several excellent advantages. The contra-rotating turbine disk cavity is a new type of rotating cavity formed by two adjacent disks rotating in opposite directions. The fluid flow and heat transfer in contra-rotating disk systems is one class of flow and heat transfer involving most complex underlying physics, and there is comparatively little information on such flow and heat transfer, which needs more researching work. The distribution of rotation-induced forces such as Coriolis force、Centrifugal force and derived buoyancy are numerically investigated. The formation mechanism of Batchelor-type flow and Stewartson-type flow and the transition mechanism between them are analyzed through the research of the coupling effects of the rotating induced forces on the boundary layer flow and the two-cell flow in the core region. The source of the earlier transition to turbulent flow in counter-rotating disk cavity compared with rotor-stator disk cavity is also investigated and explained through the research of instability of the flowing free shear layer formed by the counter secondary circulations. Meanwhile, the effects of flow structure transition on the Nusselt number and frictional moment

英文关键词： contra-rotating disk cavity；flow structures；forming mechanism；rotation-induced forces；heat transfer charicteristics