For the more commonly used Vacuum Generator samples in pneumatic instrumentation, the finite volume method was selected to carry out a numerical calculation method for the internal potential flow of the Vacuum Generator, analyzing the back pressure, not at the same time the internal pressure all over and the change in suction flow rate. To this end, we measured the change in suction flow rate when the back pressure of the system rose, created a graph correlating back pressure and suction flow rate, and proposed a way to avoid backflow conditions by distinguishing the back pressure of the system software. In the formulation and application of the Vacuum Generator manufacturer system software, it is necessary to obtain the backpressure range for the regular operation of the system software based on the basic theoretical prediction based on the experiment to avoid the backflow condition and ensure the system is working.
The characteristics of the integration of pneumatic instrumentation need to carry out experiments based on the fundamental theoretical analysis to give reference for life practice. Vacuum suction manufacturers have applied a one-dimensional centralized main parameters entity model to determine the pressure shift at the exit cross-section of the Vacuum Generator when the inlet flow changes, but because it can not be derived from the vapor rate throughout, pressure distribution, kinetic energy damage, and other information content, and can not be subsonic water jet wave system and other natural gas utility analysis, can not reveal the essential principles. There are relatively large limitations. To better analyze the correlation between the pressure at the exit cross-section and the inspiratory flow, the finite volume method is used to conduct a finite element analysis of the Vacuum Generator potential flow from a fundamental theoretical point of view, and then the inspiratory flow when the back pressure rises is examined from an experimental point of view.
