New correlation of subsonic, supersonic and cryo gas jets validated by highly accurate schlieren measurements
New correlation of subsonic, supersonic and cryo gas jets validated by highly accurate schlieren measurements
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DOI：
10.1007/s00348-013-1542-2
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发表时间：
2013-06
影响因子：
2.4
通讯作者：
J. Gerold;P. Vogl;M. Pfitzner
中科院分区：
文献类型：
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作者：
J. Gerold;P. Vogl;M. Pfitzner
采用2000fps的高速纹影显示技术，研究了8种不同压比下氦气射流对空气的瞬时穿透深度。所调查的注射压力在1.5至40巴之间。混合室中的压力在1.0到4.0巴之间变化。选择了不同的压力比来考察亚音速和欠膨胀射流。为了研究这一过程对密度的依赖关系，在不同压力比下，在224、198和173K的注射温度下进行了低温注射。利用图像处理技术测量喷嘴的穿透距离，可以看出，对于给定的喷嘴，在相同的压比下，射流的穿透行为是相同的。为了更准确地描述喷嘴和燃烧室气体密度对射流侵彻行为的影响，建立了一个新的自相似模型。用本文给出的实验数据和文献数据对模型进行了验证。
High-speed schlieren visualization at 20,000 fps was performed to investigate the transient penetration depth of helium gas jets into air at 8 different pressure ratios. The injection pressure investigated was between 1.5 and 40 bar. The pressure in the mixing chamber was varied between 1.0 and 4.0 bar. The different pressure ratios were chosen to examine subsonic and underexpanded jets. To investigate the density dependence of the process, cryo injections were performed at injection temperatures of 224, 198 and 173 K at different pressure ratios. Using the image processing technique for detecting the jet tip penetration distance, presented in this article, it can be shown that for a given injector the jet penetration behavior is the same for the same pressure ratio. A new self-similar model was developed, to describe the influence of the injection and chamber gas density on the jet penetration behavior more accurately. The model was verified with the experimental data sets presented in this paper and with literature data.