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The Simulation and Experiment Study on the Gas Flow in the No-loaded and Cold Vacuum High-pressure Gas Quenching Furnace Zhijian Wang 1,a and Xiaofeng Shang 1,b 1School of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang Liaoning, China, 110136 awangzhijian1974@sina.com, bxfshang@vip.sohu.com Keywords: Vacuum high-pressure gas quenching, Hot wire anemometer, CFD, Flow field, Pressure field.
Hot wire anemometer is used to measure the speeds of some feature points, on the one hand to provide boundary conditions for the numerical simulation, and on the other hand to compare with the numerical simulation results.
Computational Fluid Dynamics (CFD) is an important method to study the complex gas flow during high pressure gas quenching.
Fig. 5 Comparison of computer simulation with Fig. 6 Comparison of computer simulation with experimental results (X=0,Y=0.4m) experimental results (X=0, Z=0.29m) In order to compare experimental results and simulation results, we take different positions to make speed curves.
Fig. 7 Comparison of computer simulation with Fig. 8 Comparison of computer simulation with experimental results (X=0, Z=0.525m) experimental results (X=0, Z=-0.525m) Comparing the simulation results with the measured results, we can find they are basically consistent, and the error is within 10%, which proves that numerical simulation of flow field calculation and prediction is feasible and the results are reliable in high pressure gas quenching device.

CFD simulation on Laika also shows that the use of orini and powire can reduce the indoor air temperature.
Computer simulation using CFD indicated that orini can cool the entire building and the indoor temperature achieved is lower when compared to conventional wall.
In order to obtain validation data on thermal comfort with regard to the use orini and powire on Laika, simulation using Computational Fluid Dynamics (CFD) of DesignBuilder was carried out to obtain data on temperature and wind flow.
The simulation results shows that with outdoor air temperature 27°C, the system of orini and powire can reduce the indoor air temperature by 2.09°C (27°C outdoor, 24.91°C indoor).
Simulation results for temperature and wind flow in Laika (Source: author) Actually orini and powire are an integrated system with the overall shape and material of Laika.

CFD is used to do numerical simulations of multiphase flow and reaction process [1].
Li Xiang [5] did research on the particle movement through CFD-DEM numerical simulations, which indicated that bubble become larger with the implication of vibration, but the vibration amplitude and frequency has no effect on the number of bubbles generated.
In this paper, CFD technology is used to improve simulation model of VFB; and research how aperture ratio of distributor effects on fluidization characteristics under the conditions of cold model, which in order to determine the index of fluidization quality and appropriate bed pressure drop ratio for the lignite drying process. 2 Numerical simulation method 2.1 Fundamental equations Particle phase is considered as two model fluid in the Euler-Euler model, which makes it has the same form with the gas equation, and that is similar to the single phase flow equation.
The simulation shows that bubbles form when solid fraction is less than 0.2.
Fluidization technology and computer simulation [J], Computers and Applied Chemistry, 2008, 25(9): 1047-1050

CFD Analysis of Temperature Imbalance in Full Scale Tangentially Fired Coal Boiler Siti Sarah Ain Fadhila, Hasril Hasini and Mohd Nasharuddin Mohd Jaafar Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia asitisarah@uniten.edu.my, Keyword: coal, tangentially fired, temperature imbalance, computational fluid dynamics Abstract: Tangentially fired boilers are widely used in generating electricity power due to its advantage of distributing heat evenly to all furnace walls.
Currently, most of the existing studies concentrated on analysing the temperature imbalance at furnace exit and simulations are done at design condition.
Fig. 1: Front view of furnace with air and fuel arrangement Fig. 2: Tangential fired arrangement Mesh Generation Mesh generation is important in order to have a good quality of simulation.
Boosroh: Analysis of Flow and Temperature Distribution in a Full Scale Utility Boiler Using CFD, Proceeding of ICEE 2009 3rd International Conference on Energy and Environment, Malacca.(2009)

Flow Field Simulation of Fan Nozzle Jet used for Disc Tool Cooling with Fluent REN ZhongWei1,a, SONG Ming1,a, LIU YaFei2,b, LUO LiYing3,cand LIU Yang4,d 1Shenyang University of Technology，Shenyang, P.R.CHINA 2AVIC Guizhou Honglin Machinery Co., Ltd, P.R.CHINA 3Urumqi Weian Registered Safety Engineer Office (limited), P.R.CHINA 4Huainan Gede heavy equipment Co., Ltd, P.R.CHINA arzw9811210@163.com, blyf4669656@163.com, cshadow0311@sina.com, d18241515551@139.com Key Words：Nozzle, tool cooling, flow field simulation Abstract.
In order to study the effects of structural parameters on the spray nozzle, simulation and experiments were performed on injection pressure and surface tension and other factors to the ejection performance of the nozzle.
Fig.5 Nozzle velocity curve of internal and external flow field on axis Fig.6 Velocity distribution of nozzle jet in 100mm target distance and the section Conclusion In this paper, fan nozzle as the research object for the disc tool cooling. physical model of fan nozzle was established by the Solid Works software, and the simulation is carried out.
A Study of Abrasive Water jet Characteristies by CFD Simulation [J].
Wang, Analysis of Computational Fluid Dynamics-Principle and Application of CFD Software [M], Beijing: Tsinghua University Press, 2004.

Foshan, China azhongminwan@hotmail.com , bjunhuawan@sohu.com, cjingliuhnist@163.com Key Words: numerical simulation; experimental verification; multi-blade centrifugal fan; bell mouth Abstract.
The experimental verification was conducted for the simulation results and the experimental results shows that the air volume rates increase 4.7 % and 3% respectively, the level of noise is constant.
Wang Jiabing et al[4]calculated the three types of bell mouth on the internal field and the performance of multi-blade centrifugal fan used in floor standing air-conditioner by using the commercial CFD method, get the conclusion that the fan with the inward bell mouth whose exit diameter is larger than the impeller inner diameter shows the best effect.
The inward bell mouth whose exit diameter is larger than the impeller inner diameter and optimized axial height the mold line was used in the work to investigated the whole machine and by using the commercial CFD code FLUENT, the simulation results was analyzed and the optimal case was designed based on the analysis of the numerical simulation result, beside, made a sample and conducted experimental verification.
Conclusion Numerical simulation method was developed to analysis the flow field for design scheme, and experiment was conducted to verify the numerical simulation scheme with good effect, computational fluid dynamics (CFD) technique coupled with experimental investigations method can improve research and invention efficiency.

Z.F.Wang [5] used Computational Fluid Dynamics (CFD) simulation to calculate the air collector thermal performance.
C.J .Wang [6] used CFD to analyze air permeability collector performance.
They found that the simulation results and experimental results match very well.
So, numerical simulation has become one of most important methods to design the efficient and lower cost collectors.
Fig.2 The mesh of collector The simulation was conducted by solar radiation model with software Fluent6.0.

In the process ANSYS2FLOTRAN CFD program is applied.
All sides of the chamber keep radiating heat. 3.Finite element method ANSYS-FLOTRAN CFD is an advanced tool used to analyze the two and three dimensional flowing fields[2].
It usually includes three steps as follows: model building, loads applying and equation solving. 3.1model building (1) Analysis type choice:Choose the analysis function of ANSYS-FLOTRAN CFD
Fig.7 shows the change curve of actually metrical bridge voltage ∆U with acceleration. 0.0 0.1 0.2 0.3 0.4 0.5 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 a/(g) B v0/(v) Fig.7 Relation between outputt voltage of sensor and acceleration 6.Conclusions Using the finite element method and ANSYS-FLOTRAN CFD program,the temperature field is calculated in different acceleration.The calculation results and analysis results show: (1) The temperature difference between two thermistors changes with the acceleration change
[2] Guoqiang Wang, Numerical simulation and practice on ANSYS [M], Xi'an: Northwest Industry University Press, 1999. 221

CFD Simulations.
The ANSYS ICEM/CFD software is used to construct two-dimensional geometry model and the body fitted computational mesh.
Therefore, the aerodynamic performances of two different thickness airfoils as NACA6412 and NACA6422 are also calculated with CFD simulations.
The two-dimensional CFD simulations and Taguchi analysis on the aerodynamic performance of cambered airfoils suggested that the NACA64XX airfoils exhibited the maximum lift-to drag force coefficient for low Reynolds number flow conditions. 2.
Fig. 1 CFD Simulations blade-section research.

Several turbines with different geometries of the crowns were compared, whose power coefficients were numerically simulated by the CFD method.
Before the beginning of turbine designing, the CFD techniques concerned in the turbine flow simulation were introduced as following.
By the results of turbines flow simulation, power coefficients of the two turbines are listed in table 2.
Aerofoil Characteristics from 3D CFD Rotor Computations [J].
Computer Simulation, 2010, 27(3):276-280 (in chinese).