한국가시화정보학회지 (Journal of the Korean Society of Visualization)

  • 제16권3호
  • /
  • Pages.16-25
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  • 2018
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  • 1598-8430(pISSN)
  • /
  • 2093-808X(eISSN)
한국가시화정보학회 (The Korean Society of Visualization)
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Sweeping Jet의 평판 충돌 유동 특성에 관한 가시화 연구

A visualization study on flow characteristics of sweeping jet impinging on flat plate

  • 투고 : 2018.11.07
  • 심사 : 2018.12.24
  • 발행 : 2018.12.31
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초록

PIV experiments were carried out to visualize the velocity distribution of the sweeping jet impinging onto a flat plate and kinematic behavior of the jet from the fluidic oscillator. Two parameters such as four different Re cases and four different jet-to-wall distances were examined. Time-resolved two dimensional PIV measurements were performed for both streamwise and normal planes respect to the jet axis. Ensemble averaged and phase averaged velocity fields were obtained for the tested range of parameters. The sweeping frequency of the jet increases linearly with increase of Re. The kinetic energy of the sweeping jet decreases as the distance from the jet to the impinging plate increases. In addition, turbulence flow is generated due to the swinging motion of sweeping jet, and various vortices such as primary and secondary vortex are observed near the impinging wall.

키워드

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Fig. 1. Schematic of the fluidic oscillator

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Fig. 2. Experimental setup for PIV measurement

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Fig. 3. Sweeping jet frequency

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Fig. 4. Mean velocity fields of sweeping impinging jet vertical cross section (Re = 8,000, Z/dh = 3, 5, 8, 10)

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Fig. 5. Mean velocity profiles of the sweeping jet

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Fig. 6. Phase averaged velocity fields of the sweeping jet impinging on the plate (0°, 90°, 180°, 270°)

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Fig. 7. Instantaneous velocity fields of the sweeping jet impinging on the flat plate (Re = 16,000, Z/dh = 3)

GSSGB0_2018_v16n3_16_f0008.png 이미지

Fig. 8. Instantaneous vorticity fields of the sweeping jet impinging on the flat plate (Re = 16,000, Z/dh = 3)

GSSGB0_2018_v16n3_16_f0009.png 이미지

Fig. 9. Instantaneous velocity fields of the spreading wall jet at the horizontal cross section of the plate

참고문헌

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