Numerical simulation, PIV measurements and analysis of air movement influenced by nozzle jets and heat sources in underground generator hall

2018 ◽  
Vol 131 ◽  
pp. 16-31 ◽  
Author(s):  
Angui Li ◽  
Tong Ren ◽  
Changqing Yang ◽  
Jing Xiong ◽  
Pengfei Tao
Keyword(s):  
Numerical Simulation ◽  
Heat Sources ◽  
Piv Measurements ◽  
Air Movement ◽  
Underground Generator

Numerical analysis of heat flow in oxy-ethylene flame cutting of steel plate

2016 ◽  
Vol 232 (4) ◽  
pp. 742-751 ◽  
Author(s):  
Kang-Yul Bae ◽  
Young-Soo Yang ◽  
Myung-Su Yi ◽  
Chang-Woo Park
Keyword(s):  
Numerical Simulation ◽  
Heat Flow ◽  
Heat Affected Zone ◽  
Steel Plate ◽  
Cutting Parameters ◽  
Cutting Process ◽  
Heat Sources ◽  
Power Functions ◽  
Severe Problem ◽  
Ethylene Flame

To manufacture a steel structure, in the first step, raw steel plate needs to be cut into proper sizes. Oxy-fuel flame is widely used in the cutting process due to its flexibility with respect to accessibility, plate thickness, cost, and material handling. However, the deformation caused by the cutting process frequently becomes a severe problem for the next process in the production of steel product. To decrease the deformation, the thermo-elasto-plastic behavior of the steel plate in the cutting process should be analyzed in advance. In this study, heat sources in oxy-ethylene flame cutting of steel plate were modeled first, and the heat flow in the steel plate was then analyzed by the models of the heat sources using a numerical simulation based on the finite element method. To verify the analysis by the numerical simulation including the models, a series of experiments were performed, and the temperature histories at several points on the steel plate during the cutting process were measured. Moreover, the predicted sizes of the heat-affected zone by the numerical simulations according to the variation in the cutting parameters were compared to the experimental results. The power functions of the relationship between the sizes of the heat-affected zone and cutting parameters were obtained by the recursion analysis using the correlation between the results and parameters. The results of the numerical simulation showed good agreement with those of the experiments, indicating that the proposed models of the heat sources and thermal analysis were feasible to analyze the heat flow in the steel plate during the cutting process.

Validation of numerical simulation with PIV measurements for two anastomosis models

2008 ◽  
Vol 30 (2) ◽  
pp. 226-247 ◽  
Author(s):  
Jun-Mei Zhang ◽  
Leok Poh Chua ◽  
Dhanjoo N. Ghista ◽  
Tong-Ming Zhou ◽  
Yong Seng Tan
Keyword(s):  
Numerical Simulation ◽  
Piv Measurements

PIV validation of different turbulence models used for numerical simulation of a centrifugal pump diffuser

2018 ◽  
Vol 35 (1) ◽  
pp. 2-17 ◽  
Author(s):  
Ling Zhou ◽  
Ling Bai ◽  
Wei Li ◽  
Weidong Shi ◽  
Chuan Wang
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Turbulence Models ◽  
Detached Eddy Simulation ◽  
Piv Measurements ◽  
Content Type ◽  
Rotating Speed ◽  
Eddy Simulation ◽  
Image Velocimetry ◽  
Velocity Flow

Purpose The purpose of this study is to validate the different turbulence models using in the numerical simulation of centrifugal pump diffuser. Computational fluid dynamics (CFD) has become the main method to study the pump inner flow patterns. It is important to understand the differences and features of the different turbulence models used in turbomachinery. Design/methodology/approach The velocity flow fields in a compact return diffuser under different flow conditions are studied and compared between CFD and particle image velocimetry (PIV) measurements. Three turbulence models are used to solve the steady flow field using high-quality fine structured grids, including shear stress transport (SST) k-w model, detached-eddy simulation (DES) model and SST k-w model with low-Re corrections. Findings SST k-w model with low-Re correction gives better results compared to DES and SST k-w model, and gives a good predication about the vortex core position under strong part-loading conditions. Originality/value A special test rig is designed to carry out the 2D PIV measurements under high rotating speed of 2850 r/min, and the PIV results are used to validate the CFD results.

Numerical Simulation of Ventilation Air Movement in Partitioned Offices

Indoor Air ◽  
1993 ◽  
Vol 3 (1) ◽  
pp. 26-33
Author(s):  
E.G. Plett ◽  
A.A. Soultogiannis ◽  
D.B. Jouini
Keyword(s):  
Numerical Simulation ◽  
Air Movement

Study of Truck’s Aerodynamic Drag Reduction Based on Jet

2014 ◽  
Vol 635-637 ◽  
pp. 316-319
Author(s):  
Peng Guo ◽  
Jun Yuan Zhang ◽  
Qi Fei Li ◽  
Xing Jun Hu
Keyword(s):  
Numerical Simulation ◽  
Comparative Analysis ◽  
Flow Field ◽  
Drag Reduction ◽  
Pressure Distribution ◽  
Aerodynamic Drag ◽  
Outer Flow ◽  
Air Movement ◽  
Maximum Drag Reduction ◽  
Aerodynamic Drag Reduction

Multiple schemes are adapted on truck's outer flow field based on numerical simulation. Comparative analysis with the state of air flow, the pressure distribution, the air movement between the cab and cargo is pursued, then obtain the effect of jet flow velocity to the truck Cd. With the increasing of the jet velocity, Cd increases first and then decreases. The maximum drag reduction can reaches 7.38%.

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