风洞喉道可调中心体机构分析与设计

Analysis and Design of the Adjustable Central Flap Mechanism of the Second Throat in Wind Tunnel

第二喉道在跨超声速风洞中具有重要作用,中心体式第二喉道作为其中一种重要的结构形式近年来国外已开展了大量研究。本文以跨声速风洞第二喉道中心体机构的设计为背景,从偏置曲柄滑块机构原理入手,结合0.3 m风洞第二喉道可调中心体机构的结构特点,创新性地运用了对称偏置双曲柄滑块机构,并对其进行了运动学和动力学分析。风洞运行结果表明:该机构具有良好的气动性能,结构形式合理可靠。

The second throat has important functions in transonic and supersonic wind tunnel. In recent years, the second throat with central flap has been an important structure type and was widely researched abroad. This paper takes the structure design of central flap mechanism of the second throat in transonic wind tunnel as the background, starting with the principle of offset slider-crank mechanism, and combining the characteristics of central flap mechanism of the second throat in 0.3m wind tunnel. The symmetrical offset dual-slider-crank mechanism has been innovatively used, and its kinematic and dynamic characteristics have been analyzed. The results of wind tunnel tests show that this mechanism has better aerodynamic characteristics, and the structure type of the mechanism is reasonable and reliable.