带能量释放的直鳍的特性

V. Levchenko, M. Kascheev, S. Dorokhovich, A. Zaytsev
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引用次数: 0

摘要

本文得到了任意型直鳍在能量释放情况下的热传导方程。所得到的方程不同于文献中给出的近似方程,因为存在能量释放和更准确地确定弧元的长度。求解了具有连续热源的矩形肋片的方程。确定了翅片的效率和通过翅片底部的热流。结果表明,在无能量释放的情况下,翅片中的能量释放比翅片的效率更高。在翅片有能量释放的情况下,热流也有减小的趋势。对翅片能量释放值的限制是翅片适用的条件。翅片效率必须小于1。如果效率超过1,则翅片起相反的作用:气流被引导到相反的一侧。为了增加表面的积聚系数,往往要减小翅片之间的距离。这种减少是有限度的。理论上,翅片之间的距离应该至少是边界层最大厚度的两倍。经验表明,这个距离可以缩小到大约一层厚度。在文章中描述了一种方法,以实现最大的积累系数在翅片。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
CHARACTERISTICS OF A STRAIGHT FIN WITH ENERGY RELEASE
The heat conduction equation for a straight fin with an arbitrary profile in the presence of energy release in the fin is obtained in the article. The resulting equation differs from the approximate equation given in the literature by the presence of energy release and a more accurate determination of the length of the arc element. The equation is solved for the fin of a rectangular profile with continuously operating heat sources. The efficiency of the fin and the heat flow through the base of the fin are determined. It is shown that energy release in the fin increases its efficiency in comparison with the efficiency of the fin in the absence of energy release. There is also a decrease in the heat flow in the presence of energy release in the fin. The restriction on the values of energy release in the fin is found as condition for the applicability of the finning. The fin efficiency must be less than one. If the efficiency exceeds one, the fin plays the opposite role: the flow is directed in the reverse side. To increase the build-up coefficient of the surface, tend to reduce the distance between the fins. There is a limit to such reduction. Theoretically, the distance between the fins should be at least double the maximum thickness of the boundary layer. As experience shows, this distance can be reduced to about one thickness. An approach to achieve the largest build-up coefficient at finning is described in the article.
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