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为满足未来我国先进飞行器的发展需求,我国将考虑建设大型跨声速风洞,提高风洞试验模拟精细化水平。而第二喉道作为风洞Ma数控制的有效手段,被认为是提升跨声速风洞能力的关键技术之一。本文首先通过CFD数值模拟发现了二喉道段流场在某些压比下存在不对称现象,然后,利用现有引导风洞,设计加工了Ma=0.7的带可变中心体的二喉道段进行验证试验。试验结果显示,当前室总压达到某一值时,二喉道段流场会出现不对称现象,并前传影响试验段流场品质。最后利用CFD手段给出了一种无不对称现象的新型二喉道设计。
To meet the development needs of China’s advanced aerocraft in the future, China will consider building a large-scale transonic wind tunnel to improve the precision of wind tunnel test simulation. The second throat, as an effective means of numerical control of wind tunnel Ma, is considered as one of the key technologies to enhance the capability of transonic wind tunnel. In this paper, CFD numerical simulation is used to find that the flow field in the second throat section is asymmetric under some pressure ratios. Then, the second throat with variable center body with Ma = 0.7 is designed and machined by using the existing guide wind tunnel. Paragraph verification test. The experimental results show that asymmetry occurs in the flow field of the second throat when the total pressure in the current chamber reaches a certain value, and the quality of the flow field in the pilot section is affected by the previous transmission. Finally, a new type of second throat design with no asymmetry is given by means of CFD.