scholarly journals Numerical Study of Surface Pressure Fluctuation on Rigid Disk-Gap-Band-Type Supersonic Parachutes

AIAA Journal ◽  
2020 ◽  
Vol 58 (12) ◽  
pp. 5347-5360
Author(s):  
K. Kitamura ◽  
K. Fukumoto ◽  
K. Mori
Keyword(s):  
Surface Pressure ◽  
Pressure Fluctuation ◽  
Numerical Study ◽  
Rigid Disk ◽  
Band Type

A numerical study of the bubble induced pressure fluctuation in gas-fluidized beds

2017 ◽  
Vol 314 ◽  
pp. 387-399 ◽  
Author(s):  
Yuli Zhang ◽  
Rui Xiao ◽  
Mao Ye ◽  
Zhongmin Liu
Keyword(s):  
Pressure Fluctuation ◽  
Fluidized Beds ◽  
Numerical Study ◽  
Gas Fluidized Beds

scholarly journals Numerical study of unsteady flow and exciting force for swept turbomachinery blades

2016 ◽  
Vol 20 (suppl. 3) ◽  
pp. 669-676
Author(s):  
Di Zhang ◽  
Ma Jiao-Bin ◽  
Qi Jing
Keyword(s):  
Boundary Layer ◽  
Unsteady Flow ◽  
Pressure Fluctuation ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Aerodynamic Performance ◽  
Rotor Blades ◽  
Stable Operation ◽  
Straight Blade ◽  
Excitation Force

The aerodynamic performance of blade affects the vibration characteristics and stable operation of turbomachinery closely. The aerodynamic performance of turbine stage can be improved by using swept blade. In this paper, the RANS method and the RNG k-? turbulence mode were adopted to investigate the unsteady flow characteristics and excitation force of swept blade stage. According to the results, for the swept blade, the fluid of boundary layer shifts in radial direction due to the influence of geometric construction. It is observed that there is similar wake development for several kinds of stators, and the wake has a notable effect on the boundary layer of the rotor blades. When compared with straight blade, pressure fluctuation of forward-swept blade is decreased while the pressure fluctuation of backward-swept blade is increased. The axial and tangential fundamental frequency excitation force factors of 15?forward-swept blade are 0.139 and 0.052 respectively, which are the least, and all excitation force factors are in the normal range. The excitation factor of the forward-swept blade is decreased compared with straight blade, and the decreasing percentage is closely related to the swept angle. As for backward-swept blades, the situation is the other way around. Additionally, the change of axial excitation factor is more obvious. So the vibration reduction performance of forward-swept blade is better.

Surface Pressure Fluctuation Generated by a Jet Imaging on a Curved Plate

AIAA Journal ◽  
1977 ◽  
Vol 15 (9) ◽  
pp. 1348-1350 ◽  
Author(s):  
Ho Chi-Ming ◽  
Dennis A. Plocher ◽  
Howard L. Leve
Keyword(s):  
Surface Pressure ◽  
Pressure Fluctuation

An Experimental and Numerical Study of Regulating Performance and Flow Loss in a V-Port Ball Valve

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Junyu Tao ◽  
Zhe Lin ◽  
Chuanjing Ma ◽  
Jiahui Ye ◽  
Zuchao Zhu ◽  
...  
Keyword(s):  
Pressure Fluctuation ◽  
Fluid Transport ◽  
Numerical Study ◽  
Internal Flow ◽  
External Pressure ◽  
Ball Valve ◽  
Flow Coefficient ◽  
Design And Optimization ◽  
Stable Position ◽  
Valve Opening

Abstract Process valves are responsible for regulating and controlling the rate and direction of flow in pipeline systems. The V-port ball valve is one kind of process valve with a regulating performance influenced by V-angle. In this article, a DN50 V-port ball valve is taken as the research object. This work therefore aims to investigate the effect of and relationship between the V-angle on valve performance and internal flow properties via experiments and numerical simulations. Results indicate that an increase in either V-angle or valve opening causes a large-pressure fluctuation near the valve outlet, thus leading to a long pressure-stable distance. Meanwhile, the flow coefficient increases exponentially with valve opening, and the value of the exponent remains at 2.5 for different V-angles. Furthermore, the stable position of internal energy loss along the downstream pipe is well-matched with the stable position of external pressure fluctuation. This inspires a new method for controlling the pressure stability downstream from the valve. These results may facilitate improvements in the design and optimization of the process valve, thus benefiting the development of fluid transport techniques in energy industries.

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