Abstract：Aiming at the non-uniformity distribution phenomenon of airflow parameters in the pulse injection tube of dust removal equipment in chemical production field, four different profile of nozzles were designed to quantitatively analyze the relationship between the nozzle structure parameters and outlet flow field quality, and the numerical simulation study was carried out by means of computational fluid dynamics software. The results show that when inlet pressure boundary conditions are remained the same, the loss rate of the stagnation pressure are 29.28% 、22.03%、 15.44% and 9.10% respectively, after the airflow passes through the divergent nozzle, right angle nozzle, convergent nozzle and fillet nozzle. The distribution uniformity of the airflow parameters of the fillet nozzle outlet cross section is the best. It is shown that nozzle and pulse injection tube connection site profile designed with fillet will not only able to reduce the mechanical energy loss and the energy consumption of the cleaning system, but also improve the distribution uniformity of airflow parameters in the nozzle's outlet flow field. It is helpful to improve the distribution uniformity of airflow parameters and optimize the flow field quality in nozzle's outlet flow field by increasing the radius of nozzle and pulse injection pipe connection site profile and reducing nozzle diameter.

Keywords: nozzle; profile parameters; flow distribution; optimization; numerical simulation