Abstract: In order to ensure the power output，the rotating speed of the rotor system needs up to a millionrevolutions per minute in ultra-micro turbine engine on account of the millimeter-scale rotor system. It is difficultto measure the surface heat transfer coefficient of the millimeter-scale disk with super rotating speed because it isimpossible to arrange thermocouples or heat flux meters. A transient method based on lumped parameter methodis introduced to measure the surface heat transfer coefficient for a millimeter-scale rotating disk. The temperatureof the rotating disk at different times is obtained using the infrared temperature measurement technique， and then the surface heat transfer coefficient is obtained by the lumped parameter method of transient heat conduc.tion. The error between the experimental results and the theoretical solutions decreases with the increasing rotat.ing Reynolds number，and the max error is less than 13%. The results show that the method is feasible in measur. ing the surface heat transfer coefficient of the millimeter-scale disk with super rotating speed.

Key words: Transient method； Super rotating speed； Rotating disk； Millimeter-scale； Surface heat transfer coefficient

摘要： 在超微型涡轮喷气发动机中，转子系统尺寸可小至毫米级，为保证一定的功率输出，转子的转速需高达上百万转。对于该类型发动机中毫米级超高转速旋转盘表面换热特性的研究，无法布置常规手段的热电偶或热流计，表面传热系数测量异常困难。针对这一问题，提出基于集总参数法原理的旋转盘表面传热系数测量方法，即使用红外测温技术，获得转盘表面在不同时刻的温度，通过瞬态导热的集总参数法得到转盘表面的表面传热系数。结果显示:该方法与理论解误差随着旋转雷诺数的增高逐渐减小，最大误差小于 13%，表明该方法在测量毫米级超高速旋转盘表面传热系数上是可行的。

关键词: 瞬态法；超高转速；旋转盘；毫米级；表面传热系数