The influence of the geometric parameters of the nozzle device on the kinetic energy of a liquid projectile

This article discusses the influence of the geometrical parameters of the nozzle device and the time of liquid outflow through the nozzle on the kinetic energy received by the liquid projectile from the active stream. The determination of kinetic energy is one of the important parameters in the study of intermittent jet ejectors: if the energy is insufficient to perform the work, the projectile will stop and collapse in the working chamber, which will lead to a malfunction in the ejector, if the energy is greater than necessary to perform the work, then its surplus will be extinguished in the outlet pipeline, which will lead to additional energy losses and a decrease in efficiency. The dependence of the mass of the projectile on the geometric parameters of the nozzle and the time of liquid flow through the nozzle is calculated by integrating the volume of liquid. Described is a method of determining optimum time for liquid to flow through a nozzle from equations of kinetic energy and the required energy for gas compression taking into account losses and minimum permissible energy of the projectile. The minimum permissible energy of the projectile is understood as the energy at which the projectile does not lose its individuality and moves with a total mass in the working chamber. The paper illustrates the dependence of kinetic energy on the outflow time for different values of pressure drop and inertial length of the nozzle. The obtained dependencies allow us to assess the effect of the outflow time on the energy received by the liquid projectile. It is determined that the main parameters affecting the kinetic energy of the projectile are the pressure drop on the nozzle, the inertial length of the nozzle and the holding time of the nozzle in the open state or the time of outflow through the nozzle.