论文部分内容阅读
以多渠道、多机制交叉耦合为热防护结构特点的新一代高超声速飞行器必须采用气动力/热与结构多场耦合计算方法进行研究。目前,国外已建立较完善的耦合分析系统并用于飞行器研制,国内的中国空气动力研究与发展中心(CARDC)也已自主研发了热环境/热响应耦合计算平台(FL-CAPTER)。为验证多场耦合计算平台所用方法的有效性和计算结果的准确性,设计并开展气动力/热与结构耦合的地面试验具有十分重要的意义。本文结合气动力/热与结构多场耦合试验设计需求,以现有材料和设备能力为依托,开展了试验风洞选取、模型尺寸估算、模型材料选择、模型气动设计与模型结构设计工作。初步研究表明,模型支撑结构附近迎风面局部高温热膨胀将有利于模型前体结构产生可观的整体变形量。本文以此设计了带压缩拐角的二级压缩面结构模型,通过短时间不锈钢模型验证试验和计算对比分析初步验证了模型设计的可行性,并以此为基础预测了高温合金模型的试验结果。为下一步开展高温合金长时间风洞试验奠定了技术基础。
A new generation of hypersonic vehicles that are cross-coupled by multi-channel and multi-mechanism into thermal protection structures must be studied by using the multi-field coupling calculation method of aerodynamic force / heat and structure. At present, a relatively complete coupling analysis system has been established in foreign countries and used for the development of aircraft. The China National Center for Aerodynamic Research and Development (CARDC) has independently developed the FL-CAPTER. In order to verify the effectiveness of the method and the accuracy of the calculation results, it is of great importance to design and develop a ground test of aerodynamic / thermal-structural coupling. Combining the design requirements of multi-field aerodynamic / thermal and structural multi-field coupling experiments, this paper carried out experimental wind tunnel selection, model size estimation, model material selection, model aerodynamic design and model structure design based on the existing materials and equipment capabilities. Preliminary studies show that local high temperature thermal expansion of the windward surface near the support structure of the model will contribute to the considerable overall deformation of the model precursor structure. In this paper, a two-stage compression surface structure model with compression corner was designed. The feasibility of the model design was verified through short-term stainless steel model verification test and comparative analysis of calculation. Based on this, the test results of the high-temperature alloy model were predicted. It laid the technical foundation for the next step to carry out long-time wind tunnel test of superalloy.