低雷诺数下横流-射流中剪切涡的试验研究

doi:10.7527/S1000-6893.2016.0305

Abstract

Abstract:

The flow characteristic and vortical structures associated with the jet in cross-flow (JICF) is studied to reveal the mixing mechanism between coolant jet and hot cross-flow in film cooling of turbine blades. Experimental investigations on shear vortex of single-jet in cross-flow are carried out in this paper. The effects of velocity ratio, Reynolds number and inclined angle on the characteristics of shear vortex are studied mainly. Results show that the velocity ratio, Reynolds number and inclined angle have a great influence on the mixing between jet and cross-flow, and therefore affect the jet trajectory and jet penetration into cross-flow which results in various characteristics of shear vortex. We also find that the leading-edge shear vortex and trailing-edge shear vortex are formed by boundary layer vortex of jet flow and cross-flow, respectively. The trailing-edge shear vortex becomes the main flow structure when the cross-flow boundary layer vortex is stronger than jet boundary layer vortex. On the contrary, the leading-edge vortex becomes dominant.

Key words: jet in cross-flow, velocity ratio, Reynolds number, inclined angle, shear vortex

CLC Number:

O358

ZHANG Baolei, SHANGGUAN Yanqin, WANG Xian, CHEN Gang, LI Yueming. Experimental investigation on shear vortex of jet in cross-flow at low Reynolds number[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(7): 120831-120831.

References

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Experimental investigation on shear vortex of jet in cross-flow at low Reynolds number

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