风洞二喉道调节片机构分析与设计

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第二喉道在跨超声速风洞中具有重要作用,调节片式第二喉道是其中一种重要的结构形式,国内外对其已开展了大量研究。以跨声速风洞第二喉道调节片机构的设计为背景,从偏置曲柄滑块机构原理入手,结合0.3m风洞第二喉道调节片机构的结构特点,综合运用了偏置曲柄滑块机构和平行四边形机构,并对其进行了运动学分析。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, being an important structure form of it, the second throat with adjustable flaps has been widely researched at home and abroad. This paper takes the structure design of adjustable flaps mechanism of the second throat in transonic wind tunnel as the background, starting with the principle of offset slider-crank mechanism, combining the characteristics of adjustable flaps mechanism of the second throat in 0.3 m wind tunnel, the offset slider-crank mechanism and parallelogram mechanism have been synthetically used, and its kinematic characteristics has been analyzed. The results of wind tunnel tests show that this mechanism has better aerodynamic performances, the structure form of the mechanism is reasonable and reliable.