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Experimental study on flow and cooling characteristics of double-jet film-cooling holes at different spanwise distances(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2018年01期
Page:
36-43
Research Field:
研究与设计
Publishing date:

Info

Title:
Experimental study on flow and cooling characteristics of double-jet film-cooling holes at different spanwise distances
Author(s):
YAO Jiaxu;  LEI Jiang
State Key Laboratory for Strength and Vibration of Mechanical Structures, National Demonstration Center for Experimental Mechanics Education, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, China
Keywords:
film-cooling;  double-jet;  pressure sensitive paint
PACS:
V434-34
DOI:
-
Abstract:
Double-jet film-cooling structures on a flat plate at different spanwise distances(p/d=0,0.5,1.0,1.5,2.0)are investigated experimentally.The time-averaged flow field at several cross-sections in downstream of the holes is measured by a seven-hole probe, and the film-cooling effectiveness on surface of the flat plate is measured with pressure sensitive paint(PSP).The measured results indicate that the streamwise distance(s/d)is 3.0, and the blowing ratio(M)is 0.5, 1.0, 1.5, and 2.0 while the density ratio(DR)is 1.0.The interaction between the two jets, its influence on the flow and cooling characters are investigated.The results show that, as p/d=0, the interaction between the holes is presented as pressing effect, that is, the downstream jet is pressed on the wall surface by the upstream one and keeps attached to the surface, and the film-cooling effectiveness is not sensitive to blowing ratios; as p/d=0.5 and 1.0, the anti-kidney vortex effect dominates, both of the jets are pressed down on the surface, and the film coverage is good and the effectiveness is relatively high; as p/d≥1.5, the pressing effect almost disappears, the anti-kidney vortex effect weakens, the distance between the jets increases, and the film coverage degrades.

References:

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Last Update: 1900-01-01