Research On Rapid Decompression And Physical Parameter System Of Low Pressure Chambe

Fluid excitation will occur during the rapid depressurization process of an altitude chamber;fluid excitation is a major issue related to the safety of all fluid-related engineering,primarily reflected in fluid machinery;fluid excitation problem research is important in ensuring that fluid-related engineering machinery units can operate safely.CFD simulations of rapid decompression processes were carried out,and the simulation results can be used to guide the determination of the diameter,length,and design dictates scheme of the chamber capacity of the altitude chamber,and the reasonable pipe(throat)design and test scheme can effectively reduce the resonance force caused by the oscillating flow field on the inner wall of the altitude chamber,thereby reducing the harm of fluid excitation to the altitude chamber.The physical parameter data acquisition system is an important part of the rapid decompression test system,as it can realize real-time monitoring and data saving of chamber pressure,flow,and other parameters,as well as the data calculation of the general detection of specific processes and the simulated high-altitude blasting detection,so that the technical performance of the equipment can be objectively analyzed and identified during the test.The key research situation for quick decompression and physical parameter system study is as follows:(1)Finite element simulation of rapid decompression process based on FLUENT.The change curve of pressure and velocity in the decompression chamber and the larynx,as well as the equilibrium pressure and velocity distribution cloud,were obtained by setting different initial pressure conditions and the size of the throat pipe diameter,and the simulation results obtained the rapid decompression time and different degrees of fluid excitation phenomena with high accuracy.The findings inspired the scientific test procedure and throat pipeline design of the altitude chamber,reducing the harm caused by the fluctuating flow field to the chamber.The orthogonal test table is designed,the altitude chamber rapid decompression experiment is completed,the finite element simulation and rapid decompression experiment results are compared,the accuracy of the rapid decompression time and the pressure oscillation phenomenon present in the test process are verified,and the safety and reliability are established to prevent engineering accidents caused by altitude chamber resonance.(2)Mathematical model of rapid decompression based on oscillating fluid dynamics.The fundamental causes of fluid excitation in the oscillating flow field of vibrating objects were summarized,and the velocity and pressure distribution equations of the stable flow field and the oscillating flow field in the process of rapid decompression were established according to the principle of oscillating fluid mechanics,taking the small flow flow in the pipe and the pipe diameter of the throat as the main conditions.The velocity distribution and pressure distribution in the flow field were solved using the parametric polynomial method.Fluid excitation occurs during the fast decompression process,according to the numerical simulation results.(3)Development of a physical parameter test system based on LabVIEW.The rear panel uses the producer and consumer framework mode of data processing to complete the design of the front panel user interface,the main functions include real-time monitoring of cabin height,flow data,physical parameter statistics calculation,data storage and data playback,etc.,and conducts high-altitude pressurization experiments,and the experimental results verify the stability and accuracy.(4)Development of a rapid decompression automatic control system based on the Siemens S7-1500 PLC.The upper computer program is written in LabVIEW,while the rear panel design employs the event responsive producer and consumer framework mode.The rapid decompression automated control system for the low-pressure compartment has been designed and developed to completion.The primary functions are automated pressurization,automatic blasting,and automatic data record production,storage,and playback.