설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제27권7호
  • /
  • Pages.344-353
  • /
  • 2015
  • /
  • 1229-6422(pISSN)
  • /
  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
권호 표지
DOI QR코드

DOI QR Code

LDV에 의한 정사각 단면 180° 곡덕트에서 난류진동유동의 유동특성

Characteristics of Developing Turbulent Oscillatory Flows in a 180° Curved Duct with a Square Sectional by using a LDV

  • Yun, Seok-Ju (Department of Mechanical Engineering, Graduate School of Chosun University) ;
  • Lee, Haeng-Nam (Department of Mechanical Engineering, Chosun University) ;
  • Sohn, Hyun-Chull (Department of Mechanical Engineering, Chosun University)
  • 투고 : 2014.12.29
  • 심사 : 2015.06.03
  • 발행 : 2015.07.10
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

In the present study the characteristics of turbulent oscillatory flows in a square-sectional $180^{\circ}$curved duct were investigated experimentally. A series of experiments for air flow were conducted to measure axial velocity profiles, secondary flow velocity profiles and pressure distributions. The measurements were made by a Laser Doppler Velocimeter (LDV) system with a data acquisition and processing system which includes Rotating Machinery Resolve (RMR) and PHASE software. The results from the experiment are summarized as follows. (1) The maximum velocity moved toward the outer wall from the region of a bend angle of $30^{\circ}$. The velocity distribution had a positive value extended over the total phase in the region of a bend angle of $150^{\circ}$. (2) Secondary flows were generally proportional to the velocity of the main flow. The intensity of the secondary flow was about 25% as much as that in the axial direction. (3) Pressure distributions were effects of the oscillatory Dean number and respective region.

키워드

참고문헌

  1. Sohn, H. C., Lee, H. N., and Park, G. M., 2005, Axial velocity profiles and secondary flows of developing laminar flows in a straight connected exit region of $180^{\circ}$ curved duct, Transation of the KSME, Vol. 29, No. 10, pp. 1092-1100.
  2. Sohn, H. C., Lee, H. N., and Park, G. M., 2007, A study of the flow characteristics of developing turbulent pulsating flows in a curved duct, Journal of MST, pp. 2229-2236.
  3. Agrewal, Y., 1978, Laser anemometer study of flow development in a curved circular pipes, J. Fluid Mech, Vol. 85, No. 3, pp. 497-518. https://doi.org/10.1017/S0022112078000762
  4. Lyne, W. H., 1970, Unsteady Viscous Flow in a Curved Pipe, J. Fluid Mech, Vol. 45, No. 1, pp. 13-31.
  5. Munson, B. R., 1976, Experimental Results for Oscillating Flow in a Curved Pipe, Phys. Fluids, Vol, 18, No. 12, pp. 1607-1609. https://doi.org/10.1063/1.861077
  6. Naruse, T. et al., 1991, Fully developing oscillatory flow ina curved duct, Journal of JSME(B), Vol. 56, No. 529, pp. 2562-2569.
  7. Ohmi, M., Iguchi, M., and Maegawa, K., 1982, A Analysis of free oscillatory flow in a U bend, Journal of JSME(B), Vol. 48, No. 425, pp. 50-58. https://doi.org/10.1299/kikaib.48.50
  8. Talbot, L. and Gong, K. O., 1983, Pulsating Entrance Flow in a Curved Pipe, J. Fluid Mech, Vol. 127, pp. 1-25. https://doi.org/10.1017/S002211208300258X
  9. Zalosh, R. G. and Nelson, W. G., 1973, Pulsating Flow in a Curved Tube, J. Fluid Mech, Vol. 59, No. 4, pp. 693-705. https://doi.org/10.1017/S0022112073001795
  10. Sumida, M. and Sudou, K., 1986, Oscillatory Flow in curved Pipes of Rectangular Cross-Section, Bulletin of JSME, Vol. 28, No. 243, pp. 1899-1905. https://doi.org/10.1299/jsme1958.28.1899
  11. Ohmi, M. and Iguch, M., 1982, Resistance method of free oscillatory flow in U bend, Journal of JSME (B), Vol. 48, No. 426, pp. 275-283. https://doi.org/10.1299/kikaib.48.275
  12. Park, G. M., Cho, B. G., and Bong, T. G., 1998, A Study on Characteristics of laminar oscillatory flow in a square sectional curved duct, Transaction of the KSME(B), Vol. 22, pp. 143-152.

피인용 문헌

  1. Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2015 vol.28, pp.6, 2016, https://doi.org/10.6110/KJACR.2016.28.6.256