Estimation of High Heat Flux in Supersonic Plasma Flows
Estimation of High Heat Flux in Supersonic Plasma Flows
复制标题
超音速等离子体流中高热通量的估计
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Lasserre
中科院分区：
文献类型：
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作者：
S. Lohle;J. Battaglia;J. Batsale;F. Bourserau;D. Conte;P. Jullien;B. van Ootegem;J. Couzi;J. Lasserre
本研究的目的是改善高焓等离子体风洞中高达 60 MW/m2 的瞬态热通量测量。通常使用所谓的零点热量计，这意味着用热电偶测量已知材料内部的温度，并通过在一维、半无限传热假设下解决热传导问题，可以计算表面热通量。本例中的表面热通量是通过使用非整数识别模型作为估计过程的直接模型解决系统的逆热传导问题来确定的。因此，应用使用已知的可变热通量的校准测量。系统识别过程的优点是，考虑了传感器的关键设计方面，这些方面导致一维、半无限热传导假设中的显着干扰。在本文中，详细描述了经典的零点量热计以及适用于当前等离子体风洞配置的新型传感器设计。使用有限元建模，介绍了两个传感器的计算并演示了系统识别过程。清楚地概述了测量的改进，例如使用一维半无限热传导的经典方法测量的径向轮廓的不对称性无法使用新颖的方法测量
The objective of this study is to ameliorate transient heat flux measurements up to 60 MW/m2 in high enthalpy plasma wind tunnels. Usually so-called null-point calorimeters are used, which means the temperature inside a known material is measured with a thermocouple and by solving the heat conduction problem under the assumption of one-dimensional, semi-infinite heat transfer the surface heat flux can be calculated. The surface heat flux in the present case is determined by solving the inverse heat conduction problem of the system using a non integer identified model as a direct model for the estimation process. Therefore, calibration measurements using a known variable heat flux are applied. The advantage of the system identification process is, that critical design aspects of the sensor which lead to significant disturbances in the assumption of one-dimensional, semi-infinite heat conduction, are accounted for. In the paper, a classical null-point calorimeter as well as a new sensor design adapted for the present plasma wind tunnel configuration are described in detail. Using finite element modelling, calculations of both sensors are presented and the system identification procedure is demonstrated. The amelioration of the measurements are clearly outlined, e.g. an asymmetry in the measured radial profile using the classical approach of one-dimensional, semi-infinite heat conduction is not measured using the novel approach