Numerical substantiation of the parameters of the air-hydraulic hood by a diaphragm

Orifjon Bazarov,Sobir Jonkobilov,Ulugbek Rajabov,Shukhrat Xoshiyev,Ulugmurad Jonkobilov,D Bazarov

doi:10.1051/e3sconf/202126403035

Abstract

The article is about calculating the main parameters of air - hydraulic hoods with a diaphragm to reduce the emergency consequences of a water hammer, possible in the pressure pipelines of an irrigation pumping station. Based on the results of numerical studies by the method of finite differences of the proposed hydraulic shock absorber, dependencies were obtained based on a certain air in the absorbers, the total capacity of the cylindrical cap was determined to determine the main dimensions of the absorbers. Based on the results of numerical studies by the method of finite differences of the proposed hydraulic shock absorber, dependencies were obtained based on a certain air in the absorbers, the total capacity of the cylindrical cap was determined to determine the main dimensions of the absorbers. To determine the economic dimensions of the proposed cap design, comparative calculations of numerical experiments with experimental data prove the reliability of the proposed dependencies using the finite difference method.

Highlights

Analysis of existing scientific works shows that in the event of a sudden power failure in the pressure systems of pumping stations, a HSh appears with a discontinuity of the flow, which negatively affects the normal operation of the pumping unit
It is very important to develop a new method for calculating the optimal dimensions of the air-hydraulic caps (AHC) with a diaphragm
With optimal damping of the maximum pressure of the main unit in the pressure pipelines of pumping stations, it is very important to take into account the changes in the local resistance in the diaphragm of the connecting pipeline and the law of expansion and contraction of the air of the proposed bell design

Summary

Introduction

In the event of a sudden power outage of pumping stations, hydraulic shocks occur in pressure water lines from a decrease in pressure.To protect pressure pipelines of irrigation pumping stations from hydraulic shock, various types of air-hydraulic caps (AHC) are used [1,2,3,4,5,6,7,8,9,10,11,12].AHC is a steel vessel with a cylindrical shape, installed on a pressure pipeline and filled in the upper part with air.The advantages of AHC include simplicity of design, trouble-free operation, elimination of water discharge, and the absence of a possible rarefaction in the pressure pipeline. To protect pressure pipelines of irrigation pumping stations from hydraulic shock, various types of air-hydraulic caps (AHC) are used [1,2,3,4,5,6,7,8,9,10,11,12]. Based on the application of the equation of "living forces", the author obtains formulas for calculating the maximum pressure increase ∆Р for a known volume of the bell. In this case, the author considers the elasticity of the pipeline walls and the compressibility of water and air

Methods

Results

Conclusion