Abstract: Based on the application of supercritical pressure fluid in engine turbine blade regenerative cooling technology，experimental investigation of the convective heat transfer of supercritical pressure n-decane in the radial inlet tube under rotating conditions is presented. The effects of Coriolis force，buoyancy and flow acceleration on heat transfer were analyzed. This paper presents an expression for a dimensionless criterion concerning the buoyancy force generated both by gravity and centrifugal force under rotating conditions. The results showed that under high rotating speed conditions （above 500r/min），the buoyancy was mainly generated by centrifugal force and was in the strengthening zone to enhance convective heat transfer. Flow acceleration was mainly caused by pressure drop，which weakened convective heat transfer. The buoyancy，flow acceleration and Coriolis force increased with the increase of the rotational speed and under their coupling influence，the heat transfer also increased with the increase of the rotational speed. The average Nu number at 1500r/min is about 1.5 times that of 500r/min and about 2 to 4 times of static state.

Key words: Supercritical pressure fluids;Rotation;Convective heat transfer;n-decane

摘要： 针对超临界压力流体在发动机涡轮叶片再生冷却技术中的应用，对超临界压力正癸烷在旋转状态下的径向入流管内对流换热和流动进行了研究，分析了哥氏力、浮升力与流动加速对换热的影响规律，提出了适用于旋转条件下超临界压力流体对流换热的同时考虑重力浮升力与旋转浮升力的浮升力无量纲准则数。研究表明：高转速条件下（500r/min以上），浮升力主要由离心力产生且处于强化区，增强对流换热；流动加速主要由压降产生，削弱对流换热；浮升力、流动加速、哥氏力均随转速增大而增大，共同作用下对流换热也随转速增大而增大。1500r/min下平均Nu数约是500r/min的1.5倍，约为静止的2～4倍。

关键词: 超临界压力流体;旋转条件;对流换热;正癸烷