Numerical Simulation Of Spray Optimization Of Concrete Silo Surface Spray System

Spraying of concrete silo surfaces is a very important task in the process of hydraulic construction.In the process of concrete spraying and cooling,the head loss of the spraying system pipeline will lead to a large difference in the inlet pressure of the nozzles arranged along the pipeline,thus affecting the overall spraying effect.Therefore,it is of great significance to study how to improve the uniformity of the pressure distribution of the spraying system pipeline for the construction of water conservancy projects.The main research content of the thesis is as follows:(1)research on the dynamic characteristics of the pressure of the spray system pipeline.Firstly,a one-dimensional mathematical model of the high-pressure pipeline is established by using the power bonding diagram method,and the equation of state of the system is derived according to the bonding diagram theory.(2)Study on the optimisation scheme of spray system nozzle arrangement.According to the numerical simulation results of the bonding diagram model of the pipeline system,the dynamic pressure change characteristics of the pipeline system are analysed,and the uniformity of the inlet pressure of the nozzles at different locations of the pipeline under uniform arrangement is obtained.The reliability of the different optimised solutions is analysed according to the standard parameters such as pressure variance,unevenness coefficient and uniformity,and the best solution is determined by combining the spray angle and maximum spray distance.(3)The spraying characteristics of the spraying system under different arrangements are studied.A three-dimensional mathematical model of the concrete spraying system is established and the Euler-Lagrange model is used to numerically simulate the spray field.The effects of different nozzle arrangements and different nozzle inlet pressures on the atomisation characteristics such as the characteristic diameter of the droplets and the spatial distribution of the droplets are analysed.The results show that increasing the number of nozzles results in a more concentrated spatial distribution of the spray,while the SMD of the droplets also fluctuates with different arrangements,and the liquid film thickness is reduced and distributed more evenly along the central axis on the silo surface for the optimised arrangement.From the analysis of various factors it can be concluded that the nozzle optimisation scheme has a better effect in terms of medium differential distribution.