Numerical simulation of the dimensional transformation of atomization in a supersonic aerodynamic atomization dust-remov
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Numerical simulation of the dimensional transformation of atomization in a supersonic aerodynamic atomization dustremoving nozzle based on transonic speed compressible flow Tian Zhang1,2,3 • Deji Jing1,2,3 • Shaocheng Ge4 • Jiren Wang1,2,3 • Xiangxi Meng1,2,3 ShuaiShuai Ren1,2,3
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Received: 17 May 2019 / Revised: 22 January 2020 / Accepted: 25 March 2020 The Author(s) 2020
Abstract To simulate the transonic atomization jet process in Laval nozzles, to test the law of droplet atomization and distribution, to find a method of supersonic atomization for dust-removing nozzles, and to improve nozzle efficiency, the finite element method has been used in this study based on the COMSOL computational fluid dynamics module. The study results showed that the process cannot be realized alone under the two-dimensional axisymmetric, three-dimensional and three-dimensional symmetric models, but it can be calculated with the transformation dimension method, which uses the parameter equations generated from the two-dimensional axisymmetric flow field data of the three-dimensional model. The visualization of this complex process, which is difficult to measure and analyze experimentally, was realized in this study. The physical process, macro phenomena and particle distribution of supersonic atomization are analyzed in combination with this simulation. The rationality of the simulation was verified by experiments. A new method for the study of the atomization process and the exploration of its mechanism in a compressible transonic speed flow field based on the Laval nozzle has been provided, and a numerical platform for the study of supersonic atomization dust removal has been established. Keywords Aerodynamic atomization Dust-removing Laval nozzle Compressible flow field Transonic speed Dimension transform
1 Introduction Based on newly modeled data from the World Health Organization, 92% of the world population lives in places where air quality levels exceed the WHO ambient air quality guidelines for the annual mean of particulate matter & Deji Jing [email protected] 1
College of Safety Science and Engineering, Liaoning Technical University, Fuxin, China
2
Research Institute of Safety Science and Engineering, Liaoning Technical University, Fuxin, China
3
Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Fuxin, China
4
Safety and Emergency Management Engineering College, Taiyuan University of Technology, Taiyuan, China
with a diameter of less than 2.5 micrometers (PM2.5) (World Health Organization 2016). This kind of dust with a very small particle size is called respiratory dust, and it comes from industries such as mining and machining and civilian sources (Betts 2002; Chen et al. 2012; Shi et al. 2009). In addition to endangering human health through inhalation, it can also attach to many toxic and harmful substances, with which it can undergo some complex chemical reactions (Bern et al. 2009; Maertens et al. 2008; Jang and Kamens 1999). Aerodynamic spray is on
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