【摘要】 根据气体动力学原理设计安装一简易测试装置．通过对三种小孔拉伐尔喷咀的实际测试，证实这种测试技术对鉴定小孔超音速喷咀的性能、确定最佳供气压力和改进设计是可靠的．进而对这类喷咀的推广应用，提供了廉价的测试手段．更多还原

【Abstract】 According to the principle of gas dynamics,designs and installs a simple measuring device. Through testing three types of Layal nozzles with small holes, proves that the measuring technique, used to appraise the characteristics of the supersonic velocity nozzle and to choose the best pressure of gas supply , is dependable,thus proposes a cheap method to popularize and use the nozzle.更多还原