دانلود رایگان مقاله لاتین خنک کننده فیلم بر یک صفحه تخت از سایت الزویر
عنوان فارسی مقاله:
مطالعه عددی خنک کننده فیلم بر یک صفحه تخت با هدایت حرارتی ناهمسانگرد
عنوان انگلیسی مقاله:
Numerical study of film cooling over a flat plate with anisotropic thermal conductivity
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Better performance for gas turbine engines requires a higher inlet temperature, which could be far beyond 1800 K [1]. However, the performance of a turbine engine could be weakened if too much air is used for cooling. Furthermore, the structures of the hot components would become very complicated when complex cooling configurations are applied (such as impinging cooling, film cooling or internal serpentine cooling channels with ribs and fins). In recent years, the development and implementation of highly heat-resistant materials, such as ceramic matrix composite (CMC), thus have attracted increasing attentions [2–4]. Due to the complications in manufacturing the CMC hot components of a turbine engine [5,6], it is difficult to apply complex (although effective) internal cooling configurations, such as the small ribbed channel or the U type serpentine tube configurations. Alternatively, film cooling may be applied, which is simpler and easier to implement. It bleeds internal coolant onto the exterior hot surface and forms a thin cooling film. This thin film can reduce the temperature of the material and protect the surface from hot mainstream. For example, NASA has applied film cooling with round holes on a CMC vane and it passed the engineering tests successfully [7]. The entire battery of tests included fifty hours of teady state operation and 102 2-min thermal cycles from 1173 K to 1713 K. There have been extensive studies on traditional film cooling in the past 40 years. Various aspects of film cooling have been studied, such as the discrete-hole arrangement [8], interactions between the film outflow and the mainstream [9], the vortex structures and evolution [10]. To improve the coverage of a coolant’s thin film, Goldstein et al. [11], Ghorab [12] and Yusop et al. [13] studied the axial-shaped film holes with different lateral diffusion degrees. Azzi and Jubran [14] and Yao and Zhang [15,16] focused on novel film cooling configurations with converging slot-holes. All those results showed that the shaped film holes could lead to a better lateral spreading of the coolant, which can improve its coverage and enhance its cooling effectiveness. However, there were still some regions left that the thin film could not cover, which resulted in non-uniform distributions of the temperature on the target hot surface
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کلمات کلیدی:
Experimental and Numerical Study of Film Cooling with Internal ... www.tandfonline.com/doi/abs/10.1080/08916152.2011.609630 by W Peng - 2012 - Cited by 13 - Related articles This study experimentally and numerically analyzes the effect of the coolant cross-flow on film-cooling effectiveness. The three kinds of film holes considered are ... Numerical Heat Transfer, Part A: Applications - Taylor & Francis Online www.tandfonline.com/doi/abs/10.1080/10407782.2014.949131 by K Singh - 2015 - Cited by 6 - Related articles In this article, the results obtained from a detailed numerical investigation of 2D film cooling over a flat plate through single-slot injection are presented. Numerical Study of Film-Cooling Performance on a Rotating Model https://arc.aiaa.org/doi/pdf/10.2514/1.36982 by GQ Xu - 2009 - Cited by 3 - Related articles Many studies have been conducted on the performance of film cooling over the past four decades, and a large amount of the valuable results is available in the ... Numerical study of film cooling in hypersonic flows - Enlighten: Theses theses.gla.ac.uk/2063/ by X Yang - 2002 - Cited by 4 - Related articles Dec 10, 2012 - In this thesis, a numerical study of film cooling in hypersonic laminar and ... Hypersonic flow over a flat plate without film cooling was first ... A numerical study of hypersonic laminar film cooling - Cambridge ... https://www.cambridge.org/.../div-class-title-a-numerical-study-of-hypersonic-laminar-fi... by X Yang - 2003 - Cited by 6 - Related articles As shown in Fig. 1, three separate regions are present for film cooling over a flat plate using coolant injection through a slot. Just downstream of the injection slot, ... Numerical study of liquid film cooling along an inclined plate ... link.springer.com/article/10.1007/BF01541194 by WM Yan - 1993 - Cited by 12 - Related articles Oct 11, 1991 - A numerical method of analyzing liquid film cooling along an inclined plate is presented. A marching procedure is employed for solution of the ...
