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强化传热对于航空航天技术、大功率电子设备、热能动力及化工、冶金等工业部门都有极为重要的实用意义。针对降低高温壁面或高热流壁面的温度、提高设备功率及效率、缩小设备体积或降低载热体输送功率等不同要求,可以采用各种强化传热技术以达到高的性能指标。多年来,粗糙表面与锯齿翅片流道的传热性能得到了广泛研究,并已为不少工业部门所采用。本文针对高超音速进气道强化冷却的要求,研究了几种强传热表面的特性和流体P_r数的影响,获得了相应的经验公式。
Enhanced heat transfer for aerospace technology, high-power electronic equipment, thermal power and chemical industry, metallurgy and other industrial sectors have extremely important practical significance. In order to reduce the temperature of high-temperature wall or high heat flow wall, improve the power and efficiency of equipment, reduce the size of equipment or reduce the heat transfer power and other different requirements, a variety of enhanced heat transfer technology can be used to achieve high performance. Over the years, the heat transfer properties of rough surfaces and serrated fin flow channels have been extensively studied and have been adopted by many industrial sectors. In this paper, according to the requirement of hypersonic inlet cooling enhancement, the influence of several strong heat transfer surfaces and the number of P_r fluids are studied, and the corresponding empirical formulas are obtained.