Volume 19, Issue 1 (January 2019)
Modares Mechanical Engineering 2019, 19(1): 191-200 |
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Hosseini Baghdad Abadi S, Zirak S, Rajabi Zargar Abadi M. Numerical Simulation of the Sinusoidal Wave Pulsed Film Cooling Effectiveness Due to the Changing Cooling Injection Parameters. Modares Mechanical Engineering 2019; 19 (1) :191-200
URL: http://mme.modares.ac.ir/article-15-23426-en.html
URL: http://mme.modares.ac.ir/article-15-23426-en.html
1- Energy coversion Department, Mechanical Engineering Faculty, Semnan University, Semnan, Iran
2- Energy coversion Department, Mechanical Engineering Faculty, Semnan University, Semnan, Iran , s_zirak@semnan.ac.ir
2- Energy coversion Department, Mechanical Engineering Faculty, Semnan University, Semnan, Iran , s_zirak@semnan.ac.ir
Abstract: (3838 Views)
In this paper, the effect of the angle of injection on the film cooling effectiveness with sinusoidal wave pulsation is investigated at various frequencies. Four angles of injection are selected at 20, 25, 30, and 35 degrees. The pulsed flow is investigated at 3 frequencies of 2, 50, and 500 Hz. Geometry was simulated in Gambit and numerical analysis was done by Fluent software. The SST k-ω model was used for modeling turbulence. The results showed that the injection angle between 20 and 25 degrees in the frequencies studied had the most film cooling effectiveness of the central and lateral line, especially in the areas far from the edge of the hole. Higher frequencies (500 Hz) increase the effectiveness of the film cooling at the lower initial distances of the hole. At far distances, the lower frequency (2 Hz) is the most effectiveness. As the frequency increases, the difference in the cooling efficiency of the central and lateral lines decreases at different angles. As the frequency increases, the interruptions of the flow-off and the flow-on are reduced, and as a result, the instantaneous effectiveness also has a slower variation than the lower frequencies. The blowing ratio of 0.5 had the most value in comparison with the blowing ratio of 0.75 and 1 in all angles and frequencies.
Article Type: Original Research |
Subject:
Heat & Mass Transfer
Received: 2018/07/24 | Accepted: 2018/10/8 | Published: 2019/01/1
Received: 2018/07/24 | Accepted: 2018/10/8 | Published: 2019/01/1
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