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Lift Force Generation of a Moving Circular Cylinder with a Strip-Plate Set Downstream in Cruciform Arrangement: Flow Field Improving Using Tip Ends

  • Withun Hemsuwan
  • Kasumi Sakamoto
  • Tsutomu Takahashi
Original Paper
  • 10 Downloads

Abstract

A new concept of generating steady lift on a circular cylinder in uniform flow has been developed. A strip plate is placed behind a cylinder in cruciform arrangement with a suitable gap for employing the longitudinal vortex (LV). When the upstream cylinder moves parallel to the strip plate, the LV appears behind the moving cylinder near the crisscross region. The steady lift is produced by the aerodynamic effect of the vortex-induced suction flow. The vortex regime has a limited area, and the exterior is dominated by the wake which generates the negative driving force due to the drag. In this study, the negative portion near both free ends of the original cylinder was examined and restrained by attaching tip-end configurations for improving the flow field. Two types of added tip ends were evaluated that included the circular endplate and the semi-circular plate with a rectangular-shape bend. The unsteady Reynolds-averaged Navier–Stokes (URANS) simulation was employed. The numerical results were validated by the experimental data. The numerical investigation indicated that a negative lift is generated near the cylinder ends. When the accessory tip ends were employed, the semi-circular plate with a bend can suppress the disturbed flow and produce a positive lift, whereas only the circular endplate cannot.

Keywords

Circular cylinder Moving cylinder Lift force Longitudinal vortices Longitudinal vortex-induced steady lift 

Abbreviations

C

Force coefficients

Cp

Power coefficient

Cr

Courant number

D

Center diameter of the ring plate, m (see Fig. 2b)

F

Aerodynamic forces, N

L/D

Lift-to-drag ratio

Red

Reynolds number based on cylinder diameter

Scy

Moving distance of the cylinder, m

T

Torque, N m

U

Free-stream velocity, m/s

VR

Velocity ratio of the cylinder

Vcy

Moving speed of the cylinder, m/s

W

Width of the strip plate or the ring plate, m

d

Cylinder diameter, m

l

Cylinder length, m

y+

Dimensionless distance from the wall

s

Gap distance between cylinder and strip plate, m (see Fig. 2)

s/d

Gap–distance ratio of the strip plate

Δl

Small lengthwise of the splitting cylinder surface, m (see Fig. 3)

Δt

Numerical time step size, s

Δx

Minimum numerical cell width, m

ω

Angular velocity, rad/s

ρ

Density of the air, kg/m3

μ

Kinematic viscosity of air, Pa s

Subscripts

i

Index notation of the split cylinder surface

d, l

Drag and lift

x, y, z, t

Components of Cartesian coordinate (x, y, z) and tangential direction of the moving cylinder (t)

Notes

Acknowledgements

This work was supported by MEXT KAKENHI Grant Number JP16685247.

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Copyright information

© The Korean Society for Aeronautical & Space Sciences and Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Withun Hemsuwan
    • 1
  • Kasumi Sakamoto
    • 2
  • Tsutomu Takahashi
    • 3
  1. 1.Graduate School of EngineeringNagaoka University of TechnologyNiigataJapan
  2. 2.Department of Science of Technology InnovationNagaoka University of TechnologyNiigataJapan
  3. 3.Department of Mechanical EngineeringNagaoka University of TechnologyNiigataJapan

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