Assessment of the improved cooling effectiveness of modified film holes supplied by the front cavity on a vane

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-06-23 DOI:10.1016/j.csite.2025.106562

Fei Zeng, Lin Ye, Yang Li, Wei Li, Cunliang Liu, Fan Zhang

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引用次数: 0

Abstract

Vanes are generally supplied with coolant through multiple cavities. Improving film holes supplied by the front cavity can impact the overall film coverage on the vane. In this study, the deficiencies of the film cooling characteristics were analyzed. This study aimed to increase the number of film holes supplied by the front cavity of a vane, and two improved models (Vanes I and II) were proposed. The holes on the suction side were improved to 11–11–11 holes in the improved models. The showerhead hole diameter on Vane I increased by 25 %. The showerhead holes on Vane II were changed to laidback holes. The most upstream holes on the pressure surface of both improved models were changed to 11–11–11 holes. The enhanced effective cooling of the improved models under different mass flux ratios and turbulence intensities was evaluated. Compared with the original vane, Vanes I and II exhibited significantly improved effective film cooling on the showerhead and suction surfaces. The amount of film cooling also increased on the pressure surface near the showerhead. This improvement gradually decreased along the flow direction. Under different mainstream parameters, the effective film cooling rates of Vanes I and II both increased by more than 32 %. Moreover, Vane II was more resistant to turbulence intensities and mass flux ratios.

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评估由叶片前腔提供的改进膜孔的冷却效果

叶片通常通过多个空腔提供冷却剂。改善由前腔提供的膜孔可以影响叶片上的整体膜覆盖率。本文分析了气膜冷却特性存在的不足。本研究旨在增加叶片前腔提供的膜孔数量，并提出了两种改进模型（叶片I和II）。在改进模型中，吸力侧孔改进为11-11-11孔。叶片1上的花洒孔直径增加25%。叶片II上的淋浴喷头孔改为后置孔。两种改进模型的压力面最上游孔改为11-11-11孔。对改进模型在不同质量通量比和湍流强度下的有效冷却效果进行了评价。与原叶片相比，叶片I和叶片II在喷头和吸力表面的有效气膜冷却效果显著提高。在靠近喷头的压力面上，气膜冷却量也增加了。这种改善沿流动方向逐渐减小。在不同主流参数下，叶片I和叶片II的有效气膜冷却速率均提高了32%以上。此外，叶片II对湍流强度和质量通量比的抵抗能力更强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.