【摘要】 暂冲式风洞依靠上游的压力调节阀控制风洞运行压力,调压阀的压力调节性能和精度决定了风洞的压力控制精度。环状缝隙型式的调压阀可获得线性或近似线性的调节特性,且具有阀后气流对称性好、调节范围宽、阀芯移动过程中阻力变化均匀等优点,适合用于风洞调压。为了进一步增大调压阀的流通能力,可采取双阀并联调压的方式。给出了某大型暂冲式风洞主调压阀的型面设计方法和性能预测,并给出了性能实测结果。介绍了环状缝隙调压阀的调压型面的工程计算方法、压力调节性能曲线计算方法,最后给出了调压阀实测性能结果。测试结果表明:大型环状缝隙调压阀性能实测结果与理论预测吻合良好,为了匹配大流量下的压力调节要求,采取双阀并联调节的方式可提高风洞运行截止压力,方法可行。更多还原

【Abstract】 In intermittent wind tunnel,the operation pressure is controlled by control valve.The precision of pressure control is determined by the control valve’s control characteristic and precision.The orbicular-gap valve has many good qualities,such as linearity or near-linearity control characteristic,wide control range,well symmetry airflow behind valve.For augmenting the flux of the valve,the way of double-valve parallel connection can be taken.The profile design and performance prediction of an orbicular-gap valve for a large intermittent wind tunnel are presented.The performance experimental results show that the operation characteristics of the orbicular-gap valve agree reasonably well with theoretical design.更多还原