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Online since: October 2011
Authors: Zhi Xia He, Qian Wang, Cheng Cheng Zhang, Jing Wang
Simulation of Low NOx Combustion with Heating Fuel in Diesel Engine Qian WANG, Chengcheng ZHANG , Zhixia HE and Jing WANG College of Energy and Power Engineering,Jiangsu Univ,Zhenjiang,Jiangsu, China email:zcc_cool@126.com Key words: Diesel engine; Heating Fuel; Combustion; NOx Abstract: Based on sensitivity of fuel physicochemical property to temperature,in order to study the effects of fuel injection temperature on spray and combustion performance of diesel engine, commercial CFD software STAR-CD is used to simulate the spray and combustion processes of diesel engine with heating fuel spray.
The simulation is on the basis of the previous study[3].
The dynamometer card comparison between test and simulation is shown in the Fig.3.
Fig.1 Computational grid at TDC Fig.2 Test setting drawing Fig.3 The dynamometer card comparisons of test and simulation.
Simulation Research on Matching of Spray and Combustion Chamber Geometry in Diesel Engine.
Online since: September 2014
Authors: Li Liu, Yi Ping Lu, Jia De Han, Xue Mei Sun
Numerical Simulation on Air Volume Flow Rate Distribution of Stator Ducts for Salient Pole Synchronous Motor Li Liu 1, Yiping Lu 1, a, Jiade Han1, Xuemei Sun1 1School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang, 150080, China aemail:luyp2010@aliyun.com Keywords: 3D Flow Field; Numerical Simulation; Salient Pole Synchronous Motor; Stator Duct Abstract.
The air volume flow rate distribution of stator ducts along axial and circumferential was analyzed based on CFD.
Simulation results and analysis Accuracy of the analysis results.
Although the basic principles of the two calculation methods were different, the relative error was 0.5%, indicating that the simulation results were accurate.
[5] Yiping Lu, CenYu Liu, MengQi Li and so on. 3D Flow Field Numerical Simulation of Some Doubly Synchronous Motor [J].
Online since: April 2020
Authors: Yan Hang Wang, Tao Han, Kun He, Cheng Kui Zu
The neck-down deformation process of glass tube was simulated by Polyflow software, and the simulation was verified by the secondary drawing of glass perform.
After the setting of the software was completed, the calculation was performed, and then the post-processing software CFD/post was used to analyze the results.
After the software setting is completed, the calculation is preformed, and the result is analyzed by the post-processing software CFD/post.
Fig. 5 Drawing temperature process of glass tube Fig. 6 Temperature profile along drawing direction of glass tube Fig. 6 shows the temperature distribution at different locations of the glass tube obtained by simulation.
(3) The simulation results of the secondary drawing process of the glass tube are verified by self-made glass tube secondary drawing devices.
Online since: October 2013
Authors: Yang Yang Tang, Zhi Qiang Li, Yong Wang, Ya Chao Di, Huan Xu, Qing Yang
Fig.8 Mean variable profile in the boundary layer Fig.8 gives the mean variable profile in the boundary layer, GAO-YONG turbulence model has the same simulation capabilities with the DNS, better than the two-equation eddy viscosity k-ω model.
CFD analysis of cyclist aerodynamics: Performance of different turbulence-modelling and boundary-layer modelling approaches.”
Carmeliet, “CFD analysis of convective heat transfer at the surfaces of a cube immersed in a turbulent boundary layer”, Int J Heat Mass Trans, Vol. 53, 2010, pp. 297–308
Direct Numerical Simulation of Supersonic Turbulent Boundary Layer Flow.
[15] Pirozzoli S, Grasso F, Gatski TB, Direct numerical simulation and analysis of a spatially evolving supersonic turbulent boundary layer at M=2.25.
Online since: February 2014
Authors: Byeung Hun Son, Min Kyu Jung, Ji Soo Lee, Won Hwa Hong
Other similar studies include the CFD-based simulation of vertical points in high-rise buildings that are heavily affected by rain water[3].
The said simulation, however, showed limitations in drawing a correlation between such points and the amount of water collection.
Carmeliet, CFD simulation and validation of wind-driven rain on a building façade with Eulerian mulyiphase model, Building and Environment. 61 (2013) 69-81
Online since: January 2014
Authors: Antônio Gilson Barbosa de Lima, A. de Lima Cunha, Severino Rodrigues de Farias Neto, G.H.S. Pereira Filho, E.S. Barbosa, Lígia Rafaely Barbosa Sarmento
In this sense, this work proposes to numerically investigate the non-isothermal multiphase flow of a stream of ultraviscous heavy oils containing water and natural gas in submerged risers (catenary) via numerical simulation (ANSYS CFX 11.0).
Geometry and Mesh Figure 1 illustrates the three-dimensional structured mesh (800, 240 tetrahedral elements) generated in ICEM CFD, representing the physical domain of study.
The properties of the fluids used in the simulation are presented in Table 1.
The results of the simulation showed that the heavy oil has a preferred way through the center of the pipe and the other phases have a preferred way for the periphery of the pipe.
Bonizzi, R.I, Issa, On the simulation of three-phase slug flow in nearly horizontal pipes using the multi-fluid model, International Journal of Multiphase Flow 29 (2003) 1719-1747
Online since: August 2010
Authors: Wei Hua Zhang, Ji Ye Zhang, Zhi Peng Feng
The Vehicle Dynamical Analysis of a High-speed Train Passing through a Tunnel FENG Zhi-penga , ZHANG Ji-ye b and ZHANG Wei-hua Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China a zhipengfeng1@163.com, b jyzhang@home.swjtu.edu.cn Key words: Tunnel; High-speed train; CFD; Vehicle dynamics; Aerodynamics force Abstract.
With the numerical simulation, the variation of aerodynamic forces was obtained.
By applying the computational fluid dynamics (CFD) and the computational multi-body systems dynamics, the process of a train traveling through a tunnel at the speed of 350km/h was simulated numerically.
Figure 4 shows a typical time-pressure curve of the surface measuring point on train body which Figure 4 (a) for the simulation result and Figure 4 (b) for the test result.
[5] Masahiro SUZUKI, Atsushi IDO, Yutaka SAKUMA, Hiroshi KAJIYAMA: Full-Scale Measurement and Numerical Simulation of Flow around High-Speed Train in Tunnel.
Online since: October 2014
Authors: Xin Hua Wei, Hai Hong Liu, Jin Feng Du, Jia Bao Huang
Relative errors of pressure amplitudes and pressure vibrated times between simulation results and experimental results are below 10%.
CFD (Computational Fluid Dynamics) and Fluent were used to simulate flow field characters in PWM controlled solenoid valve and cut-off valve, and acquired changing regularities of them in solenoid valve when it switches between open and closed by some scholars, simulation results were confirmed by mathematical computation or experiments, which supported optimizations of Cut-Off valve in theory[8-14].
Simulation results. (1) When solenoid valve opens, pressure curve is shown in Fig.3.a.
PWM controlled variable rate spraying system shown in Fig.1 was used to carry out 3 groups of relative experiments.Pressure signals were collected by pressure transducer at 1 kHz when solenoid valve operates under the same working conditions of simulations.
(2) Compared simulation and experimental results, relative errors of pressure amplitudes and pressure vibrating times in 3 working conditions are within 10%.
Online since: June 2013
Authors: Zong Rui Hao, Bo Yan Xu, Juan Xu, Zhong Hai Zhou
The used CFD code is AVL Fire v2008.
The simulation results at the same conditions as the PLIF experiments are shown in Fig 1 (b).
The basic parameters of the engine used in the simulation are shown in Tab 3.
The simulation of mixture formation process for the proposed combustion chamber geometry is performed.
Simulation and Visualization of Liquid Phase LPG Spray.
Online since: December 2014
Authors: Hong Hui Zhu, Zhi Gang Liu, Xiao Zhi Wang
We did not consider it in the numerical simulation research in the past, and studied the overall characteristics of butterfly valve only by 2D numerical simulation, resulting in the decrease of the numerical simulation accuracy.
Butterfly valves in the system coupling overview Experts and scholars at home and abroad for butterfly valve system research, research mostly through experiment and numerical simulation.
Guo-quan huang and Cao Zhongwu by CFD software Fluent to center type butterfly valve of the opening of the different situations of simulation calculation has been made for the flow field.
Butterfly valve system of experimental design process is complicated, and need to cycle time is long, especially the coupling effect of temperature and stress is more complex, so you need to adopt the way of numerical simulation to reduce development cycle, figure 1 said the butterfly valve system designed by this paper numerical simulation of the coupling simulation of flow field.
Large diameter butterfly valve 3 d numerical simulation and analysis of flow [J].
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