Method for Heat Flux Determination of a Transpiration-Cooled Wall from Pressure Data
Method for Heat Flux Determination of a Transpiration-Cooled Wall from Pressure Data
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DOI：
10.2514/1.t4815
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发表时间：
2016-07-01
影响因子：
2.1
通讯作者：
von Wolfersdorf, Jens
中科院分区：
文献类型：
--
作者：
Loehle, Stefan;Schweikert, Sven;von Wolfersdorf, Jens
提出了一种利用压力计测量发汗冷却环境中热流密度的方法。从深度温度测量确定净表面热通量的逆问题被多孔结构后侧的气体储层中的压力变化的测量所取代。测量是基于使用非整数系统识别的原位校准。压力数据与净表面热通量直接相关。通过与不同深度处的温度读数进行比较并分析不同的冷却剂气体质量流量，假设主要压力增加是由于表面处的热通量而在样品的厚度上演变的。因此，在恒定的出流压力条件下测量增压室压力的变化，以分析表面热通量被认为是一个有价值的工具，为未来的热通量测量在蒸发冷却的环境。
An approach to measure heat flux in transpiration-cooled environments from plenum pressure gauges is presented. The inverse problem of determining the net surface heat flux from an in-depth temperature measurement is replaced by the measurement of the pressure change in the gas reservoir at the rear side of the porous structure. The measurement is based on an in situ calibration using noninteger system identification. The pressure data are directly related to the net surface heat flux. In comparison with temperature readings at different depths and by analyzing different coolant gas mass flows, the hypothesis is that the main pressure increase is evolving over the thickness of the sample due to the heat flux at the surface. Consequently, the measurement of plenum pressure changes at constant outflow pressure conditions to analyze surface heat flux is considered a valuable tool for future heat flux measurements in transpiration-cooled environments.