空化混合层中速度场分析检测方案(粒子图像测速)
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The purpose of this experimental study was to analyze a two-dimensional cavitating shear layer.
The global aim of this work was to improve understanding and modeling of cavitation
phenomena, from a 2D turbulent shear flow to rocket engine turbopomp inducers. This 2D mixing
layer flow provided us with a well documented test case to be used for comparisons between
behavior with and without cavitation. Similarities and differences enabled us to characterize the
effects of cavitation on flow dynamics. The experimental facility enabled us to set up a mixing
layer configuration with different cavitation levels. The development of a velocity gradient was
observed inside a liquid water flow using PIV–LIF (particle image velocimetry–laser induced
fluorescence). Kelvin-Helmholtz instabilities developed at the interface and vaporizations and
implosions of cavitating structures inside the vortices were observed. The mixing area grew
linearly, showing a constant growth rate, for the range of cavitation levels studied. The spatial
development of the mixing area seemed hardly to be affected by cavitation. Particularly, the
self-similar behavior of the mean flow was preserved despite the presence of the vapor phase.
Successive vaporizations and condensations of the fluid particles inside the turbulent area
generated additional velocity fluctuations due to the strong density changes. Moreover, when
cavitation developed, the Kelvin-Helmholtz vortex shape was modified, inducing a strong
anisotropy (vortex distortion as ellipsoidal form) due to the vapor phase. The main results of this
study clearly showed that the turbulence-cavitation relationship inside a mixing layer was not
simply a change of compressibility properties of the fluid in the turbulent field, but a mutual
interaction between large and small scales of the flow due to the presence of a two-phase flow.
北京欧兰科技发展有限公司为您提供《空化混合层中速度场分析检测方案(粒子图像测速)》,该方案主要用于其他中速度场分析检测,参考标准《暂无》,《空化混合层中速度场分析检测方案(粒子图像测速)》用到的仪器有德国LaVision PIV/PLIF粒子成像测速场仪。
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