This research deals with the oscillation frequency of a classical and simple flip-flop jet nozzle with one feed-back loop based on the measurements of pressure and velocity. From these measurements, the traces of pressure difference between both ends of a connecting tube are modeled by a triangular wave, and the flow velocities in the connecting tube are calculated numerically. The resulting accumulated flow work, which consists of the time integral of mass flux into the re-circulation region on the low pressure side wall from the re-circulation region on the opposite high-pressure side wall through the connecting tube, is more adequate to determine jet-oscillation frequency than any other time integrals. This includes those of momentum flux and kinetic-energy flux. It is confirmed that jet-oscillation frequency predicted on the basis of this accumulated flow work agrees well with experiment.

这项研究基于压力和速度的测量值，对具有一个反馈回路的经典且简单的触发器式喷嘴的振荡频率进行了研究。通过这些测量，用三角波对连接管两端之间的压力差的轨迹进行建模，并数值计算连接管中的流速。所产生的累积流量功，包括从相对的高压侧壁上的回流区域通过连接管进入低压侧壁上的回流区域的质量通量的时间积分，更适合于确定射流振荡频率，而不是其他任何时间积分。这包括动量通量和动能通量。