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首页> 外文会议>American Society of Mechanical Engineers(ASME) Turbo Expo vol.3; 20040614-17; Vienna(AT) >A TRANSIENT INFRARED THERMOGRAPHY METHOD FOR SIMULTANEOUS FILM COOLING EFFECTIVENESS AND HEAT TRANSFER COEFFICIENT MEASUREMENTS FROM A SINGLE TEST
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A TRANSIENT INFRARED THERMOGRAPHY METHOD FOR SIMULTANEOUS FILM COOLING EFFECTIVENESS AND HEAT TRANSFER COEFFICIENT MEASUREMENTS FROM A SINGLE TEST

机译：一次测试的同时膜冷却效率和传热系数的瞬态红外热成像方法

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In film cooling situations, there is a need to determine both local adiabatic wall temperature and heat transfer coefficient to fully assess the local heat flux into the surface. Typical film cooling situations are termed three temperature problems where the complex interaction between the jets and mainstream dictates the surface temperature. The coolant temperature is much cooler than the mainstream resulting in a mixed temperature in the film region downstream of injection. An infrared thermography technique using a transient surface temperature acquisition is described which determines both the heat transfer coefficient and film effectiveness (non-dimensional adiabatic wall temperature) from a single test. Hot mainstream and cooler air injected through discrete holes are imposed suddenly on an ambient temperature surface and the wall temperature response is captured using infrared thermography. The wall temperature and the known mainstream and coolant temperatures are used to determine the two unknowns (heat transfer coefficient and film effectiveness) at every point on the test surface. The advantage of this technique over existing techniques is the ability to obtain the information using a single transient test. Transient liquid crystal techniques have been one of the standard techniques for determining h and η for turbine film cooling for several years. Liquid crystal techniques do not account for non uniform initial model temperatures while the transient IR technique measures the entire initial model distribution. The transient liquid crystal technique is very sensitive to the angle of illumination and view while the IR technique is not. The IR technique is more robust in being able to take measurements over a wider temperature range which improves the accuracy of h and η. The IR requires less intensive calibration than liquid crystal techniques. Results are presented for film cooling downstream of a single hole on a turbine blade leading edge model.
机译：在薄膜冷却的情况下，需要确定局部绝热壁的温度和传热系数，以充分评估进入表面的局部热通量。典型的薄膜冷却情况称为三个温度问题，其中射流和主流之间的复杂相互作用决定了表面温度。冷却剂温度比主流温度要低得多，导致注射下游的薄膜区域温度混合。描述了一种使用瞬态表面温度采集的红外热成像技术，该技术可通过一次测试确定传热系数和薄膜有效性（无量纲绝热壁温）。通过离散孔注入的主流和较冷的热空气突然施加在环境温度的表面上，并使用红外热像仪捕获壁温响应。壁温以及已知的主流温度和冷却剂温度用于确定测试表面上每个点的两个未知数（传热系数和薄膜有效性）。与现有技术相比，该技术的优势在于能够使用单个瞬态测试获得信息。几年来，瞬态液晶技术一直是确定涡轮薄膜冷却的h和η的标准技术之一。液晶技术不能解决初始模型温度不均匀的问题，而瞬态IR技术可以测量整个初始模型的分布。瞬态液晶技术对照明和视角非常敏感，而红外技术则不然。红外技术在能够在更宽的温度范围内进行测量方面更加强大，从而提高了h和η的精度。与液晶技术相比，IR所需的校准强度更低。呈现了涡轮叶片前缘模型上单个孔下游的薄膜冷却结果。

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