低温风洞绝热系统的研究现状及其关键技术

Development and key technology of cryogenic wind tunnel insulation system

为保持低温风洞的内部环境温度,提高试验效率,基于低温风洞运行的特殊工况,讨论多种低温绝热方式在低温风洞中应用的可行性,总结了目前小尺寸研究型低温风洞绝热系统的研究现状,对比分析外绝热、冷箱、内绝热以及内外绝热组合等4种绝热结构的优缺点.对低温风洞内绝热系统的关键技术点——设计技术、低温流-固-热多场耦合分析技术及试验技术进行了阐述分析,并对大型低温风洞内绝热系统设计和建设过程中需要重点开展的工作进行了展望.

To retain the inner ambient temperature of the cryogenic wind tunnel, improve test efficiency and build large-scale cryogenic wind tunnel scientifically, this paper discusses the applicability of regular cryogenic insulation methods to cryogenic wind tunnel, summarizes the research status of the small-scale research-oriented cryogenic wind tunnel and analyses the differences among the external insulation, cold box, internal insulation and integration of internal and external insulation. Based on the literature analysis, it can be found that only the internal insulation is appropriate for large-scale production-based cryogenic wind tunnels. On this basis, three key technologies about the internal insulation system of large-scale cryogenic wind tunnel are elaborated, including designing, cryogenic fluid-structure-thermal analyzing and testing. Finally, future work on the design and construction of the internal insulation system of large-scale cryogenic wind tunnel are prospected.