CAJ | 학술논문

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。
위만족미래아국선진비행기적발전수구，아국장고필건설대형과성속풍동，제고풍동시험모의정세화수평。이제이후도작위풍동 Ma 수공제적유효수단，피인위시제승과성속풍동능력적관건기술지일。본문수선통과CFD 수치모의발현료이후도단류장재모사압비하존재불대칭현상，연후，이용현유인도풍동，설계가공료 Ma＝0．7적대가변중심체적이후도단진행험증시험。시험결과현시，당전실총압체도모일치시，이후도단류장회출현불대칭현상，병전전영향시험단류장품질。최후이용 CFD 수단급출료일충무불대칭현상적신형이후도설계。
China will consider the construction of large transonic wind tunnels and develop fi-ner wind tunnel test simulation techniques to meet the needs of future advanced aircraft develop-ment.As an effective means to control the Mach number,the second throat is considered to be one of the key technologies to enhance the ability of transonic wind tunnel.In this paper,we i-dentify the asymmetric field flow in the second throat by the CFD simulation.Then we design and manufacture a new second throat section with variable center subject for the model wind tun-nel.The wind tunnel test results show that the asymmetriy field flow occurs in the second throat when the total pressure reaches a certain value,which can be forward transmitted to affect the quality of the test section flow.Finally,we design a new kind of second throat which would not generate the asymmetric field flow by the CFD method.