Taylor vortices in short fluid columns with large radius ratio

1990 ◽  
Vol 2 (9) ◽  
pp. 1557-1563 ◽  
Author(s):  
C. A. Bielek ◽  
E. L. Koschmieder
Keyword(s):  
Radius Ratio ◽  
Large Radius ◽  
Taylor Vortices

Flow Model for Large Radius-Ratio Magnetic Annular Shock-Tube Operation

1962 ◽  
Vol 5 (5) ◽  
pp. 632 ◽  
Author(s):  
F. J. Fishman ◽  
H. Petschek
Keyword(s):  
Shock Tube ◽  
Flow Model ◽  
Radius Ratio ◽  
Large Radius

Periodic Velocity Measurements in a Wide and Large Radius Ratio Automotive Torque Converter at the Pump/Turbine Interface

2002 ◽  
Author(s):  
S. O. Kraus ◽  
R. Flack ◽  
A. Habsieger ◽  
G. T. Gillies ◽  
K. Dullenkopf
Keyword(s):  
Flow Field ◽  
Turbine Blade ◽  
Torque Converter ◽  
Operating Conditions ◽  
Radius Ratio ◽  
Small Radius ◽  
Large Radius ◽  
Pump Turbine ◽  
Turbine Inlet ◽  
Significant Difference

The unsteady flow field due to blade passing at the pump/turbine interface of a torque converter was studied. The current geometry is wide and has a large outer to inner radius ratio. A laser velocimeter was used to measure the periodic velocity components at four operating conditions determined by the speed ratios between the turbine and pump of 0.065 (near stall), 0.600, 0.800, and 0.875 (coupling point). The flow fields at the pump exit and turbine inlet planes were visualized and are presented. Using instantaneous pump and turbine blade positions with the velocity data, animations (“slow-motion movies”) are generated to effectively visualize and understand the unsteady behavior. The turbine inlet flow was markedly periodic due to the exiting jet/wake from the upstream pump passage; however, the pump exit flow field showed little dependence on the turbine blade positions. The highest unsteadiness was seen for the highest speed ratios. Four “shots” from the sequences of one cycle for all speed ratios and each plane are presented herein. The results are also compared to unsteady results for a previously examined torque converter with a small radius ratio to determine the effect of parametric geometric changes on the flow field. Generally, the unsteady velocity fields show no significant difference for the two geometries — the trends are the same.

Development of Taylor—Couette flow on an intermediate timescale

1985 ◽  
Vol 398 (1815) ◽  
pp. 289-305 ◽  
Keyword(s):  
Couette Flow ◽  
Perturbation Methods ◽  
Reynolds Numbers ◽  
Base Flow ◽  
Radius Ratio ◽  
Time Dependent ◽  
Taylor Vortices ◽  
Time Dependent Behaviour ◽  
Taylor Couette ◽  
Dependent Behaviour

We study the growth and decay of Taylor vortices on a timescale that is sufficiently slow to allow analysis by perturbation methods, but which is sufficiently fast to exclude the quasi-steady theory as an approximation. The time-dependent behaviour of the base flow and the Taylor vortices is studied by means of matched series for the amplitude, both for increasing and decreasing Reynolds numbers, and detailed results are presented for the case when the radius ratio equals 0.951.

scholarly journals Turbulent Taylor-Couette vortex flow between large radius ratio concentric cylinders

2004 ◽  
Vol 36 (3) ◽  
pp. 419-421 ◽  
Author(s):  
W. M. J. Batten ◽  
S. R. Turnock ◽  
N. W. Bressloff ◽  
S. M. Abu-Sharkh
Keyword(s):  
Vortex Flow ◽  
Radius Ratio ◽  
Large Radius ◽  
Concentric Cylinders ◽  
Taylor Couette

The transition to wavy Taylor vortices

1985 ◽  
Vol 157 ◽  
pp. 135-162 ◽  
Author(s):  
C. A. Jones
Keyword(s):  
Aspect Ratio ◽  
Transition Point ◽  
Unstable Mode ◽  
Radius Ratio ◽  
Time Dependent ◽  
Taylor Number ◽  
Infinite Cylinder ◽  
Taylor Vortices ◽  
Wide Range

The transition from steady axisymmetric Taylor vortices to time-dependent wavy vortices is examined. The critical Taylor number and frequency at the transition point are determined in the infinite-cylinder approximation for a wide range of parameters. The results are compared with long-aspect-ratio experiments. The variation with axial wavelength is examined, and is found to be important when the radius ratio η < 0.75. A new spatially subharmonic mode is found to be the most unstable mode in some parameter regimes. This mode is identified with the jet mode recently discovered experimentally by Lorenzen, Pfister & Mullin and by Cole.

scholarly journals Rotating Stall in Vaneless Diffuser of Large Radius Ratio.

1995 ◽  
Vol 61 (591) ◽  
pp. 3842-3847
Author(s):  
Jun Matsui ◽  
Junichi Kurokawa ◽  
Michiharu Mino ◽  
Eiji Hiroki ◽  
Takaya Kitahora
Keyword(s):  
Rotating Stall ◽  
Radius Ratio ◽  
Large Radius ◽  
Vaneless Diffuser

The Effects of Curvature Radius on Cutting Force and Stability during End Milling

2011 ◽  
Vol 314-316 ◽  
pp. 1721-1726
Author(s):  
Wan Zhu Liu ◽  
Qiang Liu ◽  
Ge Gao ◽  
Xue Yan
Keyword(s):  
Cutting Force ◽  
End Milling ◽  
Milling Process ◽  
Radius Ratio ◽  
Curvature Radius ◽  
Stable Range ◽  
Large Radius ◽  
Optimal Parameters ◽  
Cutting Point ◽  
End Milling Process

The influence of radius ratio of cutting point and cutter on cutting force and stability during end milling process is presented in this paper. To derive motion equations, a 2 DOF mechanical model of end milling considering both regenerative and self-excited effects was established. Different ratio values during three milling conditions were analyzed. Cutting forces as well as stability under different radius ratios by changing curvature radius and cutter radius were elaborated respectively. The results show that when other parameters are set fixed, cutter with relative large radius has smaller cutting force and larger stable range. Cutters with same radius will overlap on cutting force when radius ratio is large enough even under different milling conditions. The proposed analysis on cutting force and stability can be used to determine the optimal parameters, such as cutter radius and spindle speed etc. to improve the accuracy and productivity.

Periodic Velocity Measurements in a Wide and Large Radius Ratio Automotive Torque Converter at the Pump∕Turbine Interface

2004 ◽  
Vol 127 (2) ◽  
pp. 308-316 ◽  
Author(s):  
S. O. Kraus ◽  
R. Flack ◽  
A. Habsieger ◽  
G. T. Gillies ◽  
K. Dullenkopf
Keyword(s):  
Flow Field ◽  
Turbine Blade ◽  
Torque Converter ◽  
Operating Conditions ◽  
Radius Ratio ◽  
Small Radius ◽  
Large Radius ◽  
Pump Turbine ◽  
Turbine Inlet ◽  
Significant Difference

The unsteady flow field due to blade passing at the pump∕turbine interface of a torque converter was studied. The current geometry is wide and has a large outer to inner radius ratio. A laser velocimeter was used to measure the periodic velocity components at four operating conditions determined by the speed ratios between the turbine and pump of 0.065 (near stall), 0.600, 0.800, and 0.875 (coupling point). The flow fields at the pump exit and turbine inlet planes were visualized and are presented. Using instantaneous pump and turbine blade positions with the velocity data, animations (“slow-motion movies”) are generated to effectively visualize and understand the unsteady behavior. The turbine inlet flow was markedly periodic due to the exiting jet∕wake from the upstream pump passage; however, the pump exit flow field showed little dependence on the turbine blade positions. The highest unsteadiness was seen for the highest speed ratios. Four “shots” from the sequences of one cycle for all speed ratios and each plane are presented herein. The results are also compared to unsteady results for a previously examined torque converter with a small radius ratio to determine the effect of parametric geometric changes on the flow field. Generally, the unsteady velocity fields show no significant difference for the two geometries—the trends are the same.

Identification of the Impact of Radius Ratio of Horizontal to Vertical Curves on Highway Safety

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Xiaofei Wang ◽  
Jiangbei Yao ◽  
Zhengkai Li ◽  
Yuntao Liu ◽  
Jin Cai
Keyword(s):  
Highway Safety ◽  
Radius Ratio ◽  
The Impact
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