Experimental Study of Two Rows Hybrid Film Cooling Holes Over Flat Plate Surface Using IR Technology

Q4 Biochemistry, Genetics and Molecular Biology

Journal of Biomolecular Techniques Pub Date : 2023-09-13 DOI:10.51173/jt.v5i3.1231

None Ahmed A. Naji, None Harbi A. Daud, None Nabil J. Yasin, None Ahmed A. Jasim

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Abstract

The study examines the effectiveness of two rows of hybrid film cooling holes over a plate surface using infrared technology and a thermal wind tunnel. The two rows consist of seventeen coolant injection holes, with nine in the first row and eight in the second row. Two cases were studied: case 1 using cylindrical holes and case 2 using hybrid holes. Both cases had the same cross-sectional area with a hydraulic diameter of 5.3 mm and a forward coolant injection angle of 30° in the streamwise direction. Different blowing ratios (mass flows ratio between the coolant and mainstream) were tested at 0.5, 1.0, and 1.5. The study focuses on evaluating the impact of hole shape with various blowing ratios on film cooling effectiveness. In addition, thermal images of the test surface were taken via an infrared camera after reaching a steady state. The results indicated that at a blowing ratio of 0.5, there was a significant enhancement in film efficacy, with a decrease in the test surface temperature of the cylinder and hybrid hole cases by 31.8% and 35.0%, respectively, when compared to a blowing ratio of 1.0 and 1.5, which had a temperature increase. Therefore, the film cooling effectiveness decreased to 30.9% and 32.4%, and 29.5% and 31.7% for the cylinder and hybrid hole cases, respectively. Additionally, the better overall film cooling effectiveness in this study was achieved by the configuration of the hybrid holes at a blowing ratio of 0.5, which resulted in a film cooling effectiveness of 35.0%

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平板表面两排混合气膜冷却孔的红外实验研究

该研究利用红外技术和热风洞检测了平板表面两排混合薄膜冷却孔的有效性。这两排由17个冷却剂注入孔组成，其中9个在第一行，8个在第二行。研究了两种情况:情况1采用圆柱孔，情况2采用混合孔。两种情况下的截面积相同，液压直径均为5.3 mm，冷却剂在顺流方向的前注入角为30°。不同的吹气比(冷却剂与主流之间的质量流量比)在0.5、1.0和1.5下进行了测试。研究了不同吹气比下气孔形状对气膜冷却效果的影响。此外，在测试表面达到稳态后，通过红外摄像机拍摄了测试表面的热图像。结果表明:吹气比为0.5时，成膜效果显著增强，与吹气比为1.0和1.5时相比，圆筒和混合孔壳体的试验表面温度分别降低了31.8%和35.0%，且温度有所升高。因此，在气缸和混合孔工况下，气膜冷却效率分别下降到30.9%和32.4%，29.5%和31.7%。此外，在吹气比为0.5时，混合孔的配置获得了更好的整体气膜冷却效率，其气膜冷却效率为35.0%

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来源期刊

Journal of Biomolecular Techniques Biochemistry, Genetics and Molecular Biology-Molecular Biology

CiteScore

2.50

自引率

0.00%

发文量

期刊介绍： The Journal of Biomolecular Techniques is a peer-reviewed publication issued five times a year by the Association of Biomolecular Resource Facilities. The Journal was established to promote the central role biotechnology plays in contemporary research activities, to disseminate information among biomolecular resource facilities, and to communicate the biotechnology research conducted by the Association’s Research Groups and members, as well as other investigators.