跨声速风洞调节片式二喉道中心体构型初步研究

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。

Preliminary research on center body of adjusting plate second throat in transonic wind tunnel

To meet the demand of the development of a new generation of aircraft projects ,we need to improve the simula-tion precision of wind tunnel tests .The second throat ,as the precision control system for the Mach number ,can reduce the Mach number fluctuation and improve the stability of the test data .At present ,from the perspective of structural configura-tions ,the second throat can be divided into activity plugging block type ,the choke finger and the adjusting plate type .In this paper ,we study the adjusting plate second throat with the center body ,and the effect of different types of the center body on the performance of the second throat .First ,we analyze the aerodynamic performance of the second throat with different center body using numerical simulation method .Second ,we design and process four types of the second throat for validation test in the pilot wind tunnel .The numerical simulation and test results show that the second throat with the extended board center body can perform the best in terms of the total pressure loss and flow control ,and this program is adopted in the new-ly built large continuous wind tunnel .