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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >A fast response thermocouple for internal combustion engine surface temperature measurements
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A fast response thermocouple for internal combustion engine surface temperature measurements

机译：用于内燃机表面温度测量的快速响应热电偶

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摘要

A fast response thermocouple was developed for measuring surface temperatures of aluminum components in ICE combustion chambers. The key features of the design are the use of the aluminum substrate as one of the thermocouple metals and the use of a thick copper layer as the hot junction at the surface. The copper equalizes the hot junction temperature with the surrounding aluminum to correct for the differences in thermal properties between the two materials. FEA determined the optimum thickness of the copper layer to be between 100 and 125 lm. Under typical SI engine heat flux conditions, the thermocouple should be able to measure average surface temperatures within 0.19C and the magnitude of temperature swings within 6% of true values. Following the FEA, the optimized thermocouple was tested in a SI engine. Experimental results displayed the same trends as the FEA at measuring average temperatures and temperature swings, suggesting the thermocouple was performing as predicted.
机译：开发了一种用于测量ICE燃烧室中铝部件表面温度的快速响应热电偶。设计的关键特征是使用铝基板作为热电偶金属之一，并使用厚的铜层作为表面的热结。铜与周围的铝使热结温度相等，以校正两种材料之间的热性能差异。 FEA确定铜层的最佳厚度在100到125 lm之间。在典型的SI发动机热通量条件下，热电偶应能够测量平均表面温度在0.19C之内，并且温度波动幅度在真实值的6％之内。有限元分析之后，优化的热电偶在SI发动机中进行了测试。在测量平均温度和温度波动时，实验结果显示出与FEA相同的趋势，这表明热电偶的性能符合预期。

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