Precooled engine is a highly expected solution to achieve supersonic transport. As the crucial component, heat exchangers protect other components from ultrahigh temperature. In traditional design methods, the nominal result is multiplied by a safety factor, whose selection entirely depends on experience, ensuring sufficient working margin to cope with fluctuation of parameters. For aero-engine, heat exchangers must work reliably with minimum weight. An advanced method of thermal optimization design with parameters’ fluctuation is proposed and proved to be effective by experimental verification. The heat transfer area can be quantitatively linked with the design confidence level, considering the coupling effect of various parameters’ fluctuation. The probability density distribution of heat transfer area has the characteristic of positive skewness distribution. With the increase of design confidence, the required heat transfer area is growing faster and faster. After optimization, the design of heat exchanger meets the requirements and the weight is effectively controlled.

中文翻译：

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参数波动的超声发动机换热器热优化设计

预冷发动机是实现超音速运输的高度期望的解决方案。作为关键组件，热交换器可保护其他组件免受超高温的影响。在传统的设计方法中，标称结果乘以安全系数，安全系数的选择完全取决于经验，从而确保有足够的工作余量来应对参数波动。对于航空发动机，热交换器必须以最小的重量可靠地工作。提出了一种具有参数波动的热优化设计方法，并通过实验验证是有效的。考虑到各种参数波动的耦合效应，可以将传热面积与设计置信度定量关联。传热区域的概率密度分布具有正偏度分布的特征。随着设计信心的提高，所需的传热面积越来越快。经过优化，热交换器的设计符合要求，重量得到有效控制。