摘要
文中主要通过改变SCR反应器喷嘴的直径来建立一个新式喷吹管反吹的模型。利用ANSYS Fluent软件对反吹模型的直径等参数和直径相同的喷吹管反吹模型进行仿真分析,同时对进口流速、喷嘴的长度、喷嘴的截面积之和等参数进行改变,进而探究它们对于SCR反应器喷吹管反吹模型的反吹均匀性的影响进行研究。通过仿真分析的结果可以得到以下结论:首先,在等直径反吹模型中,喷嘴出口的流量变化趋势是从前向后逐渐增加的;在变直径反吹模型中,喷嘴出口的流量变化趋势都十分均匀,基本没有变化,但在两端的喷嘴流量趋势依旧存在一定的偏离平均流量的情况;通过不断改变模型中喷嘴的直径参数可以使得喷嘴出口的流量稳定性得到进一步提升;通过改变不同的尺寸参数以及设置的边界条件,可以在很大程度上影响最终反应器模型的反吹均匀性;通过试验得出,在喷嘴模型的喷吹管的进口速度越小,喷嘴模型的长度越大,喷嘴模型的截面积之和越小,其出口处的流量均匀性越好,因此得出结论:不同的边界条件和尺寸参数会影响反吹的均匀性。
This paper focuses on building a new type of blowpipe blowback model by changing the diameter of the SCR reactor nozzle.Ansys Fluent software is used to simulate and analyze the parameters such as the diameter of the blowback model and the blowpipe blowback model with the same diameter,and to change the parameters such as the inlet flow rate,the length of the nozzle,and the sum of the cross-sectional areas of the nozzle,and then investigate their effects on the blowback uniformity of the SCR reactor blowpipe blowback model.The results of the simulation analysis can be obtained as follows:first,in the equal diameter blowback model,the flow rate at the nozzle outlet tends to increase gradually from front to back;in the variable diameter blowback model,the flow rate at the nozzle outlet tends to be very uniform and basically unchanged,but the flow rate at the nozzle at both ends still has a certain deviation from the average flow rate;by continuously changing the diameter of the nozzle in the model parameters can make the nozzle outlet flow stability can be further improved;by changing different size parameters and set the boundary conditions,can largely affect the final reactor model blowback uniformity;through experiments,it is concluded that the smaller the inlet velocity of the nozzle model nozzle tube,the larger the length of the nozzle model,the smaller the sum of the cross-sectional area of the nozzle model,the better the flow uniformity at its outlet.Therefore,it is concluded that different boundary conditions and dimensional parameters will affect the uniformity of the blowback.
作者
方晓
巩文科
FANG Xiao;GONG Wen-ke(Dalian Branch of China Classification Society,Dalian 116013;School of Marine Engineering,Dalian Maritime University,Dalian 116026)
出处
《机械设计》
CSCD
北大核心
2022年第S02期72-77,共6页
Journal of Machine Design
