[1]王茜,何坤,晏鑫.带肋尾缘开缝模型内的非定常冷却性能研究[J].西安交通大学学报,2020,54(09):128-135.[doi:10.7652/xjtuxb202009014]
 WANG Xi,HE Kun,YAN Xin.Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions[J].Journal of Xi'an Jiaotong University,2020,54(09):128-135.[doi:10.7652/xjtuxb202009014]
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带肋尾缘开缝模型内的非定常冷却性能研究
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《西安交通大学学报》[ISSN:0253-987X/CN:61-1069/T]

卷:
54
期数:
2020年第09期
页码:
128-135
栏目:
出版日期:
2020-09-10

文章信息/Info

Title:
Investigation of Unsteady Cooling Performance in a Trailing Edge Cutback Model with Land Extensions
文章编号:
0253-987X(2020)09-0128-08
作者:
王茜 何坤 晏鑫
西安交通大学能源与动力工程学院, 710049, 西安
Author(s):
WANG Xi HE Kun YAN Xin
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
关键词:
燃气轮机 尾缘开缝 冷却 肋板 吹风比
Keywords:
gas turbine trailing edge cutback cooling land extension blowing ratio
分类号:
TK421
DOI:
10.7652/xjtuxb202009014
文献标志码:
A
摘要:
采用DDES(delayed detached eddy simulation)非定常数值求解方法,研究了燃气轮机叶片带肋尾缘开缝模型内非定常流动及气膜冷却特性,分析了3种吹风比(0.2,0.8,1.25)对尾缘开缝模型冷却效率的影响,对比了有、无肋板时尾缘开缝模型内的流动和冷却性能,并利用已有的尾缘开缝流量系数和开缝壁面冷却效率实验数据,验证了非定常数值求解方法的有效性和精度。研究结果表明:采用DDES非定常求解方法可以较好地捕捉尾缘开缝区域的旋涡脱落和涡系运动规律,计算得到的流量系数、壁面冷却效率与实验测量值吻合良好; 流量系数随吹风比的增加而增加,且小吹风比时流量系数增加幅度更明显; 相对于无肋板结构,尾缘开缝区域采用肋板结构时流量系数整体下降5%左右,冷却效率整体上有所提高; 对于无肋板和带肋板两种开缝模型,吹风比对绝热壁面冷却效率影响都很大。当吹风比从0.2增加到0.8时,冷却效率显著增加; 当吹风比增至1.25时,大尺度的旋涡脱落导致冷热气流强烈掺混,冷却效率反而下降。吹风比为1.25时,带肋板结构的开缝模型相比于不带肋板的开缝模型冷却效率的下降程度减小。
Abstract:
The transient DDES(delayed detached eddy simulation)methods were adopted to investigate the unsteady fluid flow and film cooling performance in a gas turbine blade with trailing edge cutback and land extensions. The film cooling effectiveness on trailing edge cutback was studied under three different blowing ratios(M=0.2, 0.8, 1.25). The flow and cooling effects in a trailing edge cutback model with land extensions were compared to that without lands. The reliability and accuracy of the transient numerical methods were validated with the existing experimental data with respect to the discharge coefficients in slot and the cooling effectiveness on cutback surface. The results show that the DDES methods are able to provide reliable predictions for the vortex shedding in trailing edge cutback region and capture the developments of vortices effectively. The computational results of discharge coefficients and cooling effectiveness are in good agreement with the experimental data. The discharge coefficient increases with the blowing ratio, and this increment is more notable at lower blowing ratios. For the trailing edge model with land extensions, the discharge coefficients are decreased by about 5% and the overall film cooling effectiveness is increased, in contrast to that without land extension configuration. The blowing ratio has a pronounced effect on the film cooling effectiveness of trailing edge cutback whether with or without land extensions. As the blowing ratio increases from 0.2 to 0.8, the film cooling effectiveness on trailing edge cutback is significantly increased. However, if the blowing ratio is further increased to 1.25, the film cooling effectiveness on trailing edge cutback decreases, which can be attributed to the large scale vortex shedding downstream the slot and hence intensifies the mixing of cooling film and main flow. With land extensions, the film cooling effectiveness on trailing edge cutback at M=1.25 drops to a smaller extent compared with the cases without land extensions.

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备注/Memo

备注/Memo:
收稿日期: 2020-01-04。作者简介: 王茜(1997—),女,硕士生; 何坤(通信作者),女,副教授。基金项目: 陕西省自然科学基金资助项目(2018JQ5109)。
更新日期/Last Update: 2020-09-10