椭圆形凹陷柱数对高负荷压缩机级联性能的影响

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2024-02-01 DOI:10.47176/jafm.17.02.2073

†. H.W.Lu, Y. P. Shi, J. C. Xin, X. Z. Kong, B. L. Peng

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引用次数: 0

摘要

采用数值模拟方法研究了设计条件下椭圆形凹点的柱数对高载荷压缩机级联（NACA65-K48）的影响。厚度为 0.2 毫米的椭圆形凹点位于弦长 10% 至 36% 的位置。跨距间隔为 5.0 毫米。比较了带有 1 至 5 个椭圆形凹陷柱的级联的性能和流场结构，结果表明，靠近壁面的湍流动能强度得到了增强，流体分离阻力随之得到了改善。所有改良的椭圆形凹陷都降低了总压力损失。此外，吸入侧的分离气泡被打破或减弱，转角分离得到改善，通道漩涡的影响范围减小。此外，级联性能参数的改善效果最初随窝柱数量的增加而增加，然后随着窝柱数量的进一步增加而降低。在柱数为 1 至 5 的情况下，级联总压力损失分别降低了 0.59%、1.47%、1.69%、1.91% 和 1.73%。

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Influence of Ellipsoidal Dimple Column Number on Performance of Highly-loaded Compressor Cascade

The impact of the column number of ellipsoidal dimples on a highly-loaded compressor cascade (NACA65-K48) under design conditions was investigated by using a numerical simulation method. Ellipsoidal dimples with a thickness of 0.2 mm were located at the position of chord length ranging from 10% to 36%. The span-wise interval was 5.0 mm. The performance and flow field structures of cascades with 1 to 5 ellipsoidal dimpled columns were compared, and the results showed that the turbulent kinetic energy intensity near the wall was enhanced and the fluid separation resistance was consequently improved. The total pressure loss was reduced by all modified ellipsoidal dimples. In addition, the separation bubble of the suction side was broken or weakened, the corner separation was improved, and the influence range of the passage vortex was reduced. Moreover, the improvement effect of cascade performance parameters initially increased with the increase in the number of dimple columns and then reduced as the number of columns was further increased. The reductions in the total pressure loss of the cascade were 0.59%, 1.47%, 1.69%, 1.91%, and 1.73% for column numbers 1 to 5, respectively.

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .