Novel Sensor for Fast Heat-Flux Measurements
Novel Sensor for Fast Heat-Flux Measurements
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DOI：
10.2514/1.32011
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发表时间：
2009-03-01
影响因子：
1.6
通讯作者：
Srulijes, Julio
中科院分区：
文献类型：
--
作者：
Knauss, Helmut;Roediger, Tim;Srulijes, Julio
原子层热堆是一种用于瞬态热通量测量的新型快速响应传感器。该传感器的非常快的频率响应允许高度时间分辨热通量测量高达1 MHz的范围。它的工作原理是基于横向塞贝克效应。输出信号与辐射通量密度成正比，在mW/cm ~ kW/cm范围内具有线性特性，其稳态和非稳态响应已通过实验确定。结果与解析解得到的理论值吻合得很好。此外，还对原子层热电堆通过激波的动态特性进行了评价。原子层热电堆计在激波过去后不到1 μ s的时间内记录了热通量的阶梯变化。当单位雷诺数为11.31 × 10(6)/m时，热通量达到峰值后，可以检测到层流边界层态。此外，在M = 6的高超声速锥形边界层中进行的不稳定性研究中，特别证明了原子层热堆的时间分辨率和空间分辨率。除了220370khz频率范围内的第二模不稳定性外，光谱中的第二个峰在430- 730khz处显示了这种不稳定性的第一谐波。
The Atomic Layer Thermopile is a novel fast-response sensor for transient heat-flux measurements. The sensor's very fast frequency response allows for highly-time-resolved heat-flux measurements up to the 1 MHz range. Its working principle is based on the transverse Seebeck effect. The output signal is directly proportional to hent-flux density and has it linear characteristic from the mW/cm(2) to the kW/cm range, Its steady and unsteady responses have been determined experimentally by it step change of imposed radiative flux. The results correlate well with theoretical values obtained from analytical solutions. Furthermore, the dynamic properties of the Atomic Layer Thermopile have also been evaluated by it passing shock wave. The Atomic Layer Thermopile gauge recorded a steplike change in heat flux less than 1 mu s after the shock had passed. After the peak heat flux, a laminar boundary-layer state could he detected for a unit Reynolds number of 11.31 x 10(6)/m. In addition, in particular, the temporal resolution and the spatial resolution of the Atomic Layer Thermopile were demonstrated in instability studies performed in a hypersonic conical boundary layer at M = 6. In addition to second-mode instability in the 220370 kHz frequency range, a second peak in the spectra revealed a first harmonic of this instability at 430-730 kHz.