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Effect of expansion tube structure on regeneration of Diesel particulate filter Junchao Zhang1,a, Jiayi Du1,b and Daowei Ding1,c 1School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China azhangjc0801@126.com,bjydu@ujs.edu.cn,cjsdxddw@sina.com Key Words: expansion tube; diesel particulate filter; numerical simulation Abstract.
The regeneration process is simulated under the condition of different expansion tubes by the established model on CFD technology.
This paper adopts numerical simulation to study the regeneration process under the conditions of different expansion tubes to explore the effect of expansion tube structure parameters on DPF working process which provides a reference for the carrier structure design and optimization.
Numerical simulation of soot filtration and combustion within diesel particulate filters [J].

Numerical Simulation on Spreading Characteristic of Coach Fire Liang YI1,2,a, Jie CHEN1,b 1 Institute of Disaster Prevention Science and Safety Technology, Central South University, 410075, Changsha, China 2 Key Laboratory of Operation Safety Technology on Transport Vehicles, Ministry of Transport, PRC, 100088, Beijing, China ayiliang@mail.csu.edu.cn, b chenjie.20071007@163.com Keywords: coach fire; numerical simulation; heat release rate; temperature distribution.
Fire numerical simulation Model.
In this simulation the coach fire is caused by 1 Kg gasoline which spilt around the last but one row seats.
The influence of ventilation on fires were demonstrated in this simulation.
Numerical simulation on spreading characteristic of typical coach fire was performed by CFD means.

Numberical Simulation of Labyrinth Screw Pump with Separated Structure by Fluent Jiaojiao Li1,a, Youchen Zhang2,b 1Beijing University of Chemical Technology, Beijng China 100029, China 2Beijing University of Chemical Technology, Beijng China 100029, China alijiaojiaobuct@163.com,bzhangyc@mail.buct.edu.cn Keywords: Labyrinth screw pump, Rotor and stator separated, Ring slots, Numerical simulation Abstract. 3D model and grid was conducted in Gambit,while single-phase flow field in the pump was simulated in CFD code-Fluent,by means of multiple reference frame (MRF) method, Renormalization group k-ε two-equation turbulence model(RNG k-εmodel) and Semi-Implicit Method for Pressure-Linked Equations (SIMPLEC) algorithm.
In the simulation,the author selected MRF model and SIMPLEC algorithm based on pressure-velocity coupling,and discreted velocity,turbulent kinetic energy and turbulent kinetic energy dissipation rate with second order wind format.
Simulation result Reference to the three different separated structure LSPs,there were ring slots between each separated sections,ring slot parameters did effect on the velocity and static pressure inside the pump.So,in the working condition that inlet flow Q=2.0m3/h,we did simulation of the three model flow field with different ring slot parameters respectively,and then analysed the relationship between the parameters and pumping performance and obtained the optimal ring slot parameters.
Conclusions The present study exhibited three new structure LSPs with rotor or stator separated,which was numerical simulated with Fluent in 3D model.The simulation results were analysed and the conclusions were as follows
(1)Numerical simulation was carried out on three structure pumps with different ring slot parameters,and found that optimal ring slot width makes pump performance the best were 5mm, 3mm,4mm respectively in rotor separated LSP,stator separated LSP and rotor stator all separated LSP

Numerical Simulation of Gas-Particle Two Phase Flow in the Process of Cold Spraying Aluminum Zinc-Base Alloy Powder Chuanshao Liua, Jiangwei Chengb and Jianxin Zhengc Henan Polytechnic University, Jiaozuo 454003, P.R.
China alcs@hpu.edu.cn, bchengjiangwei.123@163.com, czhengjx@hpu.edu.cn Keywords: Cold spraying, Particle velocity, Gas-particle two phase flow, Numerical simulation Abstract.
The simulation results showed that the gas axial velocity and particle velocity increased when the gas pressure and temperature were increased, spray distance had little effect on the flow field in the nozzle, and small diameter particle was more easily accelerated.
Ju analyzed the supersonic free shot flow of compressible gas based on numerical simulation, obtained the distribution of gas pressure, velocity and temperature, and the effect of various parameters on flow field [4].
The Aluminum Zinc-base alloy gas-particle flow fields in and out of the nozzle are analyzed based on CFD software, and the influences of different processing parameters on gas velocity and particle velocity are studied in this paper.

The commercial CFD (Computational Fluid Dynamics) ANSYS FLUENT V.16 was used to solve the system of equations.
Methods adopted in numerical simulations.
Numerical Simulation of Wave Flow over the Spiral-Reef Overtopping Device.
Simulation of irregular waves by CFD.
CFD Optimisation of an oscillating water column wave energy converter.

Then a computational fluid dynamics (CFD) method is used to analyze the aerodynamic performance of this integrated configuration.
It is obvious that a well approximation between our simulation and ref.[6].
Fig.2 Cabin and cargo position of the BWB Fig.3 CFD mesh of the integrated configuration Fig.4 Lift coefficeint compared with ref.[6] Fig.5 Drag polar of each BWB mesh size Results and disscussion In this paper, aerodynamic performance of the integrated configuration in cruising and taking off are simulated and analyzed.
A structured grid code was used to generate the 3-D CFD mesh based on the integrated configuration geometry.

The Diesel-RK commercial software carried out the simulation the engine was chosen.
Rashid, “CFD Simulation Analysis of Sub-Component in Municipal Solid Waste Gasification Using Plasma Downdraft Technique,” CFD Lett., vol. 14, no. 8, pp. 63–70, 2022
Mirsalim, “Analysis the effect of advanced injection strategies on engine performance and pollutant emissions in a heavy duty DI-diesel engine by CFD modeling,” Int.
Mahkamov, “Multi-zone diesel fuel spray combustion model for the simulation of a diesel engine running on biofuel,” Proc.
Bekdemir, “Understanding the role of low reactivity fuel stratification in a dual fuel RCCI engine – A simulation study,” Appl.

The effects of pressure and humidity variations on pressure drop of the draw resistance standard rod Qian Miao 1, Jing Cheng 2, Hang Zhao1,a, Rong-Chao Yang 1 and Zhong-Di Su2 1 Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, China 2 Department of mechanics, China Jiliang University, Hangzhou, China a ken0321@sina.com Keywords: Draw resistance standard rod, pressure and humidity variations, velocity distribution, numerical simulation, pressure drop Abstract.
Two factors have been selected to investigate the effects of environmental condition variations on pressure drop of draw resistance standard rods and a series of numerical simulations have been carried out.
Fig. 3 The sectional drawing of the rod Numerical Simulation and Results Analysis A common CFD software Fluent has been adopted to simulate the gas flow phenomena.
The present numerical results reveal that our simulation method is effective in calculating the pressure drop of the draw resistance standard rod.

Numerical models and simulation approach Model geometry and mesh.
For the all scenarios analyzed in this study, the same grid size of 5μm is used to mesh the models for the CFD simulations.
The CFD simulation analysis on the combustor performance under different operating conditions has been reported in the previous sections.
Fig.5 shows the measured and predicted outlet temperatures between the measurements and the simulation.

Computational fluid dynamics (CFD) has proved to be a useful tool for the reveal of fluid micro-motion and turbulent transportations.
The dynamic simulation of sludge settling processes with the speed of 105r/min can be described in Fig. 7.
With the increase of blade speed, the simulation results show that removal efficiency of the first-stage rotational flow grit chamber decreases gradually, which is consistent with experimental results to verify the reliability of simulation results.
Then the 3-D numerical simulation of the two-phase flow field and suspended solid concentration was studied.
Comparison between simulation data and experimental data showed a satisfactory agreement.