EI、Scopus 收录
中文核心期刊
Chuanping Shao, . Control of circular cylinder wakes at relatively high Reynolds numbers[J]. Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(2): 153-161. DOI: 10.6052/0459-1879-2006-2-2005-241
Citation: Chuanping Shao, . Control of circular cylinder wakes at relatively high Reynolds numbers[J]. Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(2): 153-161. DOI: 10.6052/0459-1879-2006-2-2005-241

Control of circular cylinder wakes at relatively high Reynolds numbers

  • A narrow strip has bee introduced as an element to controlcircular cylinder wakes at Reynolds numbers Re=3.0×10 3~2.0× 10 4. The strip is 0.18D (D is diameter of the cylinder) wide, 0.015D~0.025D thick and as long as the cylinder. The long margins of the strip are parallel to and coplanar with the cylinderaxis. The strip is fixed by a row of small rods distributed along a meridianand perpendicularly connected to the surface of the cylinder. The rods havebeen proven to have negligible influence on the flow. The control parameteris strip position, which can be determined byλ/(0.5D)-(unified) distance between the cylinder axis and the length-wise centerline of the strip, and β-angle of attack of the strip.The experiment was conducted in a low turbulence wind tunnel of test section2m long, 60cm wide and 60cm high. Two circular cylinders ofdiameter D=3cm and 5cm were tested respectively in the range ofβ=0°~ 180° and λ/(0.5D)=1.1~3.8. The overall information of the cylinder wake was visualizedby smoke-wire technique and the detailed local information offluctuating velocity was detected by a hot-wire anemometry at various pointsfrom Y/(0.5D)= -6.0 to 6.0 at a stream-wisestation X/D=12.5.Visualization pictures and power spectra of fluctuating velocities show thatvortex shedding on both sides of the cylinder can be effectively suppressedif the strip is located in a certain zone in the near wake. The effectivezones at Re=6.3×103, 1.0×104 and 1.64×104 have been found out with accuracy 0.1 of λ/0.5D and 2.5° of β. The zone enlarges slightly with theincrease of Re in the range tested.Distributions of turbulence intensity for variousβfrom0° to 180° at λ/(0.5D)=2.9 and Re=1.64×104 have been measured. Compare with the case without control, the turbulence intensity on both sides of the wake isreduced when βis in the range of 0°~ 50° or in the vicinity of 180°. However, in the range β=60°~ 120°, an increase appears on the side where the stripresides, while no increase presents on the opposite side.Total resistance on cylinder and control element for variousβfrom 0°to 180°at λ/(0.5D)=2.9 and Re=1.64×104 has been evaluated by momentum integrationusing measured velocity profiles. It shows that the total resistance in therange ofβ=0°~ 40° and in the vicinity of β=180° is obviously smaller than the resistance on bare cylinder. The maximum reduction of resistance is about 32%, which happens atβ=25°~ 30°.All the results mean, local passive interference of the strip can induceglobal changes of the wake at high Reynolds numbers.
  • Related Articles

    [1]Huang Guangjing, Dai Yuting, Yang Chao. PLASMA-BASED FLOW CONTROL ON PITCHING AIRFOIL AT LOW REYNOLDS NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(1): 136-155. DOI: 10.6052/0459-1879-20-183
    [2]Li Congzhou, Zhang Xinshu, Hu Xiaofeng, Li Wei, You Yunxiang. THE STUDY OF FLOW PAST MULTIPLE CYLINDERS AT HIGH REYNOLDS NUMBERS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(2): 233-243. DOI: 10.6052/0459-1879-17-346
    [3]Du Lei, Ning Fangfei. SCALE ADAPTIVE SIMULATION OF FLOWS AROUND A CIRCULAR CYLINDER AT HIGH SUB-CRITICAL REYNOLDS NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 2014, 46(4): 487-496. DOI: 10.6052/0459-1879-13-384
    [4]Wang Sai, Shao Chuanping. SUPPRESSION OF VORTEX SHEDDING FROM AN OSCILLATING CIRCULAR CYLINDER BY A SPLITTER PLATE[J]. Chinese Journal of Theoretical and Applied Mechanics, 2012, (4): 787-791. DOI: 10.6052/0459-1879-11-341
    [5]LARGE EDDY SIMULATION OF THE TURBULENT FLOW AROUND A CIRCULAR CYLINDER AT SUB-CRITICAL REYNOLDS NUMBERS[J]. Chinese Journal of Theoretical and Applied Mechanics, 1999, 31(1): 100-105. DOI: 10.6052/0459-1879-1999-1-1995-010
    [6]FLUCTUATING SURFACE PRESSURES OF TWO CIRCULAR CYLINDERS IN TANDEM ARRANGEMENTS SUBJECTED TO WAVE AND CURRENT FLOW AT HIGH REYNOLDS NUMBERS[J]. Chinese Journal of Theoretical and Applied Mechanics, 1997, 29(2): 136-141. DOI: 10.6052/0459-1879-1997-2-1995-208
    [7]HYDRODYNAMIC FORCES ACTING ON AN ELASTIC CIRCULAR CYLINDERIN COMBINED WAVE AND CURRENT FLOW AT HIGH REYNOLDS NUMBERS[J]. Chinese Journal of Theoretical and Applied Mechanics, 1995, 27(1): 1-9. DOI: 10.6052/0459-1879-1995-1-1995-399
    [8]A NUMERICAL STUDY OF VORTEX SHEDDING FROM A CIRCULAR CYLINDER IN PLANE MIXING LAYERS[J]. Chinese Journal of Theoretical and Applied Mechanics, 1993, 25(3): 356-361. DOI: 10.6052/0459-1879-1993-3-1995-652
    [9]PRESSURE DISTRIBUTIONS ON TWO CIRCULAR CYLINDERS OF SIDE-BY-SIDE ARRANGEMENTS IN HIGH-TURBULENCE FLOW AT HIGH REYNOLDS NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 1992, 24(5): 522-528. DOI: 10.6052/0459-1879-1992-5-1995-771
    [10]SEPARATION FLOW AROUND A CYLINDER IN SHEAR FLOW AT A HIGH REYNOLDS NUMBER[J]. Chinese Journal of Theoretical and Applied Mechanics, 1990, 22(4): 463-467. DOI: 10.6052/0459-1879-1990-4-1995-970

Catalog

    Article Metrics

    Article views (2780) PDF downloads (905) Cited by()
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return