导板式扇形喷嘴清洗射流流场的数值模拟

Numerical simulation of fan nozzle of guide board type cleaning jet flow field

为了提高导板式扇形喷嘴射流清洗效率和清洗质量,优化喷嘴结构,针对以水为单介质流体的导板式扇形喷嘴的流场特性,利用Pro/E软件建立了不同导流距离、导流面倾角和清洗距离的三维导板式扇形喷嘴模型.采用标准k-ε模型,并运用ANSYS Workbench软件对导板式扇形喷嘴的流场速度、压力等物理量进行了射流流场数值模拟.在边界条件和初始条件相同的情况下,分析了导板式扇形喷嘴在不同结构参数和不同清洗距离下的射流特性变化规律,从而为导板式扇形喷嘴的设计和优化提供了一定参考依据.结果表明:随着导板式扇形喷嘴倾斜角度θ的增大,打击在清洗件上的压力值逐渐减少,相反清洗范围则逐渐增大;随着清洗距离的增大,被清洗件轴线上压力逐渐减少,同时清洗范围有小幅度的增大;在20°的扇形倾斜角度、15和25mm的导流距离及80~120 mm的喷头清洗距离下,导板式扇形喷嘴的清洗效果最佳.研究结论可为扇形喷嘴的设计和优化提供参考.

In order to improve the cleaning efficiency and the cleaning quality of guide plate type fan nozzle jet, and optimize its structure, several 3D models of the fan nozzle jet at different diversion distances, diversion angles and cleaning distances are established by using Pro/E software, which is aimed at the flow field characteristics of fan nozzle jet only around water. Based on the standard k - ε model, the numerical simulation of jet flow field is conducted for its flow velocity and pressure by the ANSYS Workbench software. The changing regularity of these models＇ jet flow characteristics under the same boundary and initial condition is analyzed, which is beneficial to the design and optimiztion the guide board type fan nozzle. The results show that with the increase of inclination 0, the blowing pressure on the cleaned piece gradually decreases; on the contrary the clean range increases. As cleaning distance increases, the pressure on the cleaned part axis gradually decreases and the clean range slightly increases. Thus, the cleaning effect of fan nozzle of guide board type is the best under the condition that the fan inclination is 20°, the fan striking distance is 15 mm or 20 mm and installation height of nozzle is between 80 mm and 120 mm. The conclusion can provide reference for the design and optimization of fan nozzle.