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首页> 外文期刊>The Open Thermodynamics Journal >Thermal Product of Fast Response Temperature Sensors for Transient Heat Transfer Applications with Numerically Determined Surface Heat Flux History
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Thermal Product of Fast Response Temperature Sensors for Transient Heat Transfer Applications with Numerically Determined Surface Heat Flux History

机译：具有数值确定的表面热通量历史的瞬态传热应用快速响应温度传感器的热量积

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A dynamic calibration technique for evaluating the thermal product values of different scratched temperature sensors is presented. These sensors have renewable junction, fast response time and it can be used for transient heat transfer measurements in hypersonic vehicles. Two types of scratch were used, mainly abrasive papers with different grit sizes and scalpel blades with different thicknesses to form the sensor junction. The effect of scratch technique on the sensor's thermal product is investigated. The sensors were tested in shock tube facility at different operating conditions. It was observed that the thermal product of a particular sensor depends on the Mach number, surface junction scratch technique, junction location as well as on the enthalpy conditions. It was also noticed that using scalpel blade technique with a particular blade size gives consistent thermal product values. Thus, it does not require an individual calibration. However, for sensors whose junction created using abrasive paper technique with different grit sizes, a calibration for each sensor is likely to be needed. The present results have provided useful and practical data for thermal product values for different scratched temperature sensors. These data are beneficial to the experimentalists in the field and it can be used for accurate transient heat transfer rate determination. Furthermore, the present calibration technique has shown that the response time of these sensors is on the order of microseconds (less than 50 μs) and it has a rise time less than 0.3 μs. A numerical technique was used in the calculation of the heat transfer rate by developing a MATLAB routine to obtain the transient heat flux history from the measured surface temperatures history.
机译：提出了一种动态校准技术，用于评估不同的刮擦温度传感器的热产品值。这些传感器具有可再生结，响应时间快，可用于高超音速车辆的瞬态传热测量。使用了两种类型的划痕，主要是具有不同粒度的砂纸和具有不同厚度的手术刀刀片，以形成传感器接合处。研究了刮擦技术对传感器热产品的影响。传感器在冲击管设施中的不同操作条件下进行了测试。据观察，特定传感器的热量乘积取决于马赫数，表面结点刮擦技术，结点位置以及焓条件。还应注意的是，使用具有特定刀片尺寸的手术刀刀片技术可获得一致的热产品值。因此，它不需要单独的校准。但是，对于使用砂纸技术创建的具有不同粒度的结的传感器，可能需要对每个传感器进行校准。本结果为不同的刮擦温度传感器的热产品值提供了有用和实用的数据。这些数据对本领域的实验人员是有益的，并且可以用于准确的瞬态传热速率测定。此外，当前的校准技术表明，这些传感器的响应时间约为微秒（小于50μs），上升时间小于0.3μs。通过开发MATLAB例程以从测得的表面温度历史记录中获得瞬态热通量历史记录，将数值技术用于传热速率的计算。

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