| In the hot strip production process,descaling has been an indispensable important processes, the current technology that domestic and international use is high-pressure water descaling, and in the high-pressure water descaling system, the jet nozzle is the key components, its function is not only to convert the water pressure which provide by high-pressure pumps to kinetic energy, but also to ensure that Jet has a good flow characteristics and dynamic performance. So the study and optimization of the nozzle geometry,establish the relationship between the structural parameters of jet nozzle and its jet property have important meaning to increase the effects of descaling system.This paper uses numerical simulation of simulation analysis and experimental research.First apply CFD software FLUENT to simulate the three-dimensional flow field and analyse simulation result of the inside and outside flow field of the Descaling high-pressure nozzle, and then developed a nozzle experimental stage,experiment on the nozzle which has the same specifications with the simulation model,combine the theoretical and practical,study the relationgships between the construct parameters of the nozzle,the various status and the internal and external flow field and jet combat, the specific research content is as follows:(1)A three-dimensional mathematical model of internal flow field in high-pressure descaling nozzle was established by the Gambit software.Using the Laminar model offered by Fluent software to simulate the incompressible,steady state internal flow field of the nozzles with different constructional parameters,and analysed the influence of nozzle parameters which include the astringent angle,the diffuse angle and diameter on the velocity distribution,pressure distribution and outlet axial velocity of the flow field.(2)Through the three-dimensional modeling and simulation to the subsonic gas-liquid two-phase turbulent external flow field of high-pressure water descaling nozzle.study the pressure distribution and velocity distribution after water spray into the air from the nozzle.discuss the the impact that system pressure and the target distance to the Jet flow and the scope distribution of combat force by simulation of the variable parameters.then forecast the best target distance,provide a strong theoretical basis to determine the level spacing and height of the nozzle.(3)Using the High-pressure Descaling nozzle performance experiment table and the related software which developed by fluid transmission and control Institute of Wuhan University of Science and Technology, through testing the jet characteristics of the nozzle which model has been selected.find the relationship of parameters such as system pressure, target distance, jet attack force and jet width.compare with the theoretical calculations and simulation results which we obtain before, validate the accuracy of numerical simulation, thereby guiding processing, selection and layout of the nozzle.
|
PDF Full Text Request