This paper describes the development of heated double-sided thin film gauge configurations for transient heat transfer measurements. By heating the substrate it is possible to measure the heat flux over a range of surface temperatures and deduce the adiabatic wall temperature and the external heat transfer coefficient. The accuracy of the measurement depends on the stability of the regression of heat flux against wall temperature and can be improved by extending the range of wall temperature over which the regression is performed. In this paper we compare two methods of local heating: double-sided gauges with an underside thin film heater and self-heating double-sided gauges. Both arrangements have been used in the Oxford Turbine Research Facility to measure the heat transfer on the uncooled turbine shroud of the MT1 high-pressure turbine stage at engine-representative conditions. These measurements yield improved regressions compared to conventional techniques to determine the adiabatic wall temperature and the heat transfer coefficient.

本文介绍了用于瞬态传热测量的加热型双面薄膜液位计配置的发展。通过加热基板，可以测量表面温度范围内的热通量，并推导出绝热壁温度和外部传热系数。测量的准确性取决于热通量对壁温的回归的稳定性，并且可以通过扩展进行回归的壁温范围来提高。在本文中，我们比较了两种局部加热的方法：带底部薄膜加热器的双面仪表和自加热双面仪表。牛津涡轮研究设施已使用这两种装置来测量代表发动机的MT1高压涡轮级的未冷却涡轮机罩上的热传递。与确定绝热壁温和传热系数的常规技术相比，这些测量结果改善了回归。