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新一代先进飞行器的发展,对风洞试验数据的稳定性和精细化水平提出了更高的要求。而二喉道,作为马赫数精确控制系统,可降低试验流场马赫数波动量,提高试验数据稳定性。二喉道从结构构型上可分为调节片式、活动堵块式和栅指式。本文针对调节片加中心体式二喉道,研究不同中心体构型对二喉道性能的影响。首先,利用数值模拟手段定性研究不同中心体构型的二喉道的气动性能;其次,通过风洞试验,设计加工了4种构型的二喉道进行验证试验。数值模拟和试验验证表明:加长板中心体在总压损失和流场控制方面综合性能最好,并在新建的大型连续式风洞中采用了加长板中心体方案。
The development of a new generation of advanced aircraft has set higher requirements for the stability and refinement of wind tunnel test data. The second throat, as Mach-exact control system, can reduce the fluctuation of Mach-flow field and improve the stability of test data. Second throat from the structural configuration can be divided into conditioning slice, blockage and activities of the grid finger type. In this paper, we investigate the effect of different center configurations on the performance of the second throat by using the center-mounted second throat. First, the aerodynamic performance of two throats with different central body configurations is qualitatively studied by means of numerical simulation. Secondly, through the wind tunnel test, four types of second throats are designed and tested. The numerical simulation and experimental verification show that the extended center body has the best overall performance in terms of total pressure loss and flow field control, and the long center plate is adopted in the newly constructed large continuous wind tunnel.