THE EFFECTS OF CHANNEL SUPPLIES ON OVERALL FILM-COOLING EFFECTIVENESS

IF 1.9 3区工程技术 Q3 ENGINEERING, MECHANICAL Journal of Turbomachinery-Transactions of the Asme Pub Date : 2023-10-27 DOI:10.1115/1.4063927

Emma Veley, Karen A. Thole, David G. Bogard

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Abstract

Abstract Cooling components in the hot section of a gas turbine is essential to component durability. Common methods of cooling include rib turbulators in internal passages and film cooling on external surfaces. The holes that produce the film cooling are fed from the internal channels often containing ribs. Consequently, there is an interdependence of internal heat transfer and external film cooling. The purpose of this study was to obtain a better understanding of the interaction of ribs and film cooling. To quantify the cooling performance the surface temperatures were measured from which overall effectiveness was calculated. For the experiments, additively manufactured test coupons were made of Inconel 718 to match engine Biot numbers. These test coupons had internal feed channels with and without ribs and had both cylindrical holes and meter diffuser shaped holes with 15° lateral expansion angles and a 1° forward expansion angle. A single rectangular channel was one type of feed channel. The other type of feed channels was individual circular channels with each circular channel supplying an individual film-cooling hole. The experimental results showed that the circular individual channels have 80% higher baseline overall effectiveness than the single rectangular channel without any film cooling. Ribbed turbulators without film cooling also increased the overall effectiveness by 21% for single rectangular channel and by 29% for the circular individual channels compared to the respective non-ribbed channels. Overall, a less effective supply channel will have a greater benefit from film-cooling than a highly effective supply channel.

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通道供给对整体气膜冷却效果的影响

摘要燃气轮机热段冷却部件对部件的耐用性至关重要。常见的冷却方法包括内部通道的肋形湍流器和外部表面的薄膜冷却。产生气膜冷却的孔通常是从含有肋的内部通道馈送的。因此，内部传热和外部膜冷却是相互依赖的。本研究的目的是为了更好地了解肋和膜冷却的相互作用。为了量化冷却性能，测量了表面温度，从而计算了总体效率。在实验中，采用增材制造的Inconel 718试样与发动机Biot编号相匹配。这些测试板具有带肋和不带肋的内部进给通道，具有15°横向膨胀角和1°正向膨胀角的圆柱形孔和仪表扩散孔。单一矩形通道是一种馈电通道。另一种进料通道是单独的圆形通道，每个圆形通道提供一个单独的气膜冷却孔。实验结果表明，圆形单个通道的基线总体效率比未进行膜冷却的单个矩形通道高80%。与非肋形通道相比，无膜冷却的肋形湍流器在单个矩形通道上的整体效率提高了21%，在圆形单个通道上的整体效率提高了29%。总的来说，效率较低的供应渠道将比高效的供应渠道从气膜冷却中获得更大的好处。

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

Journal of Turbomachinery-Transactions of the Asme 工程技术-工程：机械

CiteScore

4.70

自引率

11.80%

发文量

168

审稿时长

9 months

期刊介绍： The Journal of Turbomachinery publishes archival-quality, peer-reviewed technical papers that advance the state-of-the-art of turbomachinery technology related to gas turbine engines. The broad scope of the subject matter includes the fluid dynamics, heat transfer, and aeromechanics technology associated with the design, analysis, modeling, testing, and performance of turbomachinery. Emphasis is placed on gas-path technologies associated with axial compressors, centrifugal compressors, and turbines. Topics: Aerodynamic design, analysis, and test of compressor and turbine blading; Compressor stall, surge, and operability issues; Heat transfer phenomena and film cooling design, analysis, and testing in turbines; Aeromechanical instabilities; Computational fluid dynamics (CFD) applied to turbomachinery, boundary layer development, measurement techniques, and cavity and leaking flows.