出流比及旋转数对回转通道流动换热的影响  

Effects of Flow Distribution Ratio and Rotation Number on Flow and Heat Transfer of Rotating Internal Cooling Channels

作　　者：赵曙[1] 朱惠人[1] 郭涛[1] 张丽[1] 周志翔[2] 

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]中国航空动力机械研究所,湖南株洲412002

出　　处：《西安交通大学学报》2014年第6期117-121,138,共6页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展计划资助项目(2013CB035702)

摘　　要：为深入了解涡轮动叶内通道在旋转状态下的换热分布以及出口流量变化对通道壁面换热的影响,采用数值模拟方法研究了旋转带肋回转通道的流动特性,揭示了旋转数、出口流量分配比例对内通道换热的影响机理.计算模型包含3个通道和2个转弯段,通道进口雷诺数为17 000,旋转数为0～0.09,3种工况下出口1、2、3与入口的质量流量比分别为27％、49％、24％（三个出口均有出流）,27％、0％、73％（出口2不出流）,27％、73％、0％（出口3不出流）.结果表明：静止内通道的出流比变化仅对第3通道的沿程压力系数Cp和前、后缘面努赛尔数Nu分布有影响;旋转内通道的出流比变化会影响Cp的大小,旋转哥氏力使通道前、后缘面的Nu分布不同;离心力使径向出流通道的Cp随旋转数的增加而缓慢增大,径向入流通道的Cp随旋转数增大而迅速减小;肋扰流涡使沿程展向平均Nu沿流向呈多波峰状分布;转弯回流涡使得转弯下游通道的Nu不对称分布.Numerical simulation is employed to study a rotation cooling channel model with 90° ribs.The purpose of the study is to reveal the influence mechanism of the rotation number and discharge ratio on internal cooling channel heat transfer characteristics and to understand the heat transfer distribution of internal channel in rotor blades.The model contains 3 passages and 2 turn areas.The inlet Reynolds number and rotating number in passages are 17 000 and 0 to 0.09.The outlet mass flow rate discharge ratios in three passages are 27％49％24％,27％0％73％,and 27％73％ 0％,respectively.The results show that only the pressure coefficient and Nu distribution in the third channel are affected by the discharge ratio in the static channel,and the pressure coefficient and Nu distribution are obviously changed in the rotation channel,and that the pressure coefficient increases along radial outflow and decreases along radial inflow due to centrifugal force.The lateral average of Nu distributes in a multiple-peak form as the result of secondary flow induced by rib turbulators.The distribution of Nu in the downstream channel of turning area gets asymmetric due to turning eddy.

关 键 词：带肋通道 出流比 旋转数 对流传热 数值计算 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]