Numerical Research on the Effect of Base Cavity upon the Projectile Flow Field

2019 ◽  
pp. 1728-1733
Author(s):  
Zhihong Ye ◽  
Zhongxian Li ◽  
Haibo Lu
Keyword(s):  
Flow Field ◽  
Base Cavity ◽  
Numerical Research

Numerical Research on Flow Field Characteristics within the Slipstream of a Propeller

2012 ◽  
Vol 224 ◽  
pp. 55-60
Author(s):  
Zhong Zhe Duan ◽  
Pei Qing Liu ◽  
Li Chuan Ma
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Scientific Basis ◽  
Disk Model ◽  
Actuator Disk ◽  
Numerical Result ◽  
Light Load ◽  
Strip Theory ◽  
Flow Field Characteristics ◽  
Numerical Research

Numerical research on three dimensional flow field of a propeller and actuator disk model have been made. Under design conditions (headway 66.889m/s, revolving velocity 2575rpm）, the Slipstream flow field after Propeller is solved by RANS equations with structure mesh. Chosen 12 million mesh through verification of reliability analysis. The numerical result consists of the flow field and vortex field in the propeller slipstream. With comparison to the calculation result of standard strip theory and actuator disk model, it is shown that for light load propeller with the side small contraction of slipstream, in the slipstream cross section after 0.6R away from downstream of propeller rotation plane, the axial, circular and radial induced velocity coefficient by Prandtl’s blade tip corrected standard strip theory result; three dimensional flows numerical simulation and actuator disk model are well consistent. It verified the correctness of standard strip theory and also provided scientific basis for the correction of actuator disk model

Numerical Research on 3-D Flow Field in 5×5 Rod Bundles With Spacer Grids

2010 ◽  
Author(s):  
Rui-feng Tian ◽  
Xiao-hui Mao ◽  
Pu-zhen Gao ◽  
Xiao-jun Wang
Keyword(s):  
Flow Field ◽  
Single Phase ◽  
Mass Conservation ◽  
Momentum Conservation ◽  
Rod Bundles ◽  
Experiment Data ◽  
Spacer Grids ◽  
Simplec Algorithm ◽  
Numerical Research ◽  
Hybrid Grids

3-D single-phase flow field in 5×5 rod bundles with spacer grids was studied by numerical method. Using hybrid grids technique, SST k-ω model and SIMPLEC algorithm, the Reynolds averaged mass conservation and momentum conservation equations were solved, and the pressure and velocity field were obtained. The simulation results show that the spacer grids leads to intense lateral flow in rod bundles channel, and it submitted parabola distributing raw; axial velocities were distributed uniformly in the channel; drag coefficient decreased as inlet Reynolds number increased. Calculated results agreed with experiment data well, it shows that numerical methods employed in this paper is suitable to study flow field in 5×5 rod bundles.

Numerical Research on Aerodynamic Characteristics of Lane-Changed Overtaking Cars Based on Overlapping Grid

2012 ◽  
Vol 224 ◽  
pp. 343-347 ◽  
Author(s):  
Xing Jun Hu ◽  
Lei Liao ◽  
Jing Yu Wang ◽  
Zhi Zhang ◽  
Feng Tao Ren
Keyword(s):  
Flow Field ◽  
Theoretical Foundation ◽  
Aerodynamic Characteristics ◽  
Side Force ◽  
Numerical Research

Based on overlapping grid, two cars were simulated numerically through computer when lane-changed overtaking and the aerodynamic characteristics of two cars were achieved. By analysis the coefficients of side force and yawing moment and the flow field around two cars when two cars’ position changed the flow motivation and rules of interference each other were researched. The conclusions can provide the theoretical foundation for the research of transient overtaking

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