Fluid Analysis On New Anti-freeze Fluid Nozzle And Structure’s Optimization

This paper introduces the flat fan nozzle.This nozzle is used in automatic spray device of the coal train. At the same time, some problems occurring in the process of using the flat fan nozzle are pointed out in this paper. According to different phenomena brought about by different problems, the causes of these problems by using related theories of Fluid Mechanics and nozzle’s design method are analyzed in this paper. According to the results of the analysis, the new flat fan nozzle, which is derived from changing the structure’s parameters of the original flat fan nozzle, is simulated by using fluid analysis software, Fluent. By comparing and analyzing the different results, the research gets the new flat fan nozzle which has appropriate structure’s parameters. The study of this paper provides theoretical basis for this new flat fan nozzle’s design.The residual anti-freeze liquid will flow out from the original flat fan nozzle when the pipe’s valve of automatic spray device is shuttled down. When the residual anti-freeze liquid drops on the hook heads of the coal train, it will gradually corrode the hook heads and reduce the working life of the hook heads. Besides, the leakage of the anti-freeze liquid leads to the waste of its resources and pollutes the environment as well.In order to solve this problem, a leakage-proof structure is added to the end of the original flat fan nozzle, which is able to stop the residual anti-freeze liquid from flowing out from the flat fan nozzle. However; when this new flat fan nozzle is used in work, the anti-freeze liquid, instead of forming the original flat fan surface under the same spray conditions, it flows out from this new flat fan nozzle in the shape of water column at slower speed.According to related theories of Fluid Mechanics and nozzle’s design method, it is found out that some internal structure’s parameters of the new flat fan nozzle are inappropriate. The inappropriate parameters result in stable injection pressure not being able to be established before the anti-freeze liquid injects from the new flat fan nozzle. The new flat fan nozzle is not able to reach much higher injection speed than the original flat fan nozzle. On the basis of the theoretical analysis of the experiment results, the characteristics of the new fluid flat fan nozzle to which the leakage-proof structure is added is analyzed in this paper. Firstly, by making use of the Gambit software, models are created and finite element grid is divided before simulated by Fluent. Secondly, the mesh files must be imported into Fluent and some constraints are added to these finite element models. Thirdly, Fluent simulates these models and gets simulation data. Finally some parameters which need to be modified are found in this paper. After those inappropriate parameters are changed, the same procedure is repeated, and the new simulation data are derived. After treatment, much appropriate structure’s parameters are got in this paper.The results of fluid simulation prove that the new flat fan nozzle which has appropriate structure’s parameters not only solve the leakage problem but also ensure the fan spraying surface.The study of new flat fan nozzle in this paper provides some reference value and guiding significance for improving structure’s parameters of the flat fan nozzle which used in different places.