대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제36권3호
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  • Pages.325-333
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  • 2012
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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원형 및 타원형 노즐 내부유동과 외부유동의 상관관계

Correlations of Internal Nozzle Flow in Circular and Elliptical Nozzles with External Flow

  • Ku, Kun-Woo (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.) ;
  • Hong, Jung-Goo (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.) ;
  • Park, Cheol-Won (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.) ;
  • Lee, Choong-Won (Dept. of Mechanical Engineering, Kyungpook Nat'l Univ.)
  • 투고 : 2011.10.21
  • 심사 : 2012.01.16
  • 발행 : 2012.03.01
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초록

원형 및 타원노즐의 내부유동과 외부유동의 상관관계를 알아보기 위해 실험적 연구가 수행되었다. 분사압력에 따라 유량, 분무각, 액적크기 등의 외부유동에 관해 관찰하였고, 노즐 내부유동의 유속 및 압력분포 등을 수치해석을 통해 정량적인 결과를 도출하였다. 외부유동의 경우, 동일한 압력조건하에서 타원형 노즐의 경우, 원형 노즐에서 나타나지 않는 표면분열의 분무특성을 관찰할 수 있었고, 수치해석을 통해 노즐 내부의 유동을 분석한 결과, 원형의 경우와는 달리 타원형 노즐의 단축에서 내부유동의 재부착이 노즐 벽면에서 발생되었다. 타원노즐 외부유동의 표면분열이 내부유동에 따른 결과라고 판단된다.

An experimental study was carried out to determine the correlation between the internal flow in a circular nozzle and elliptical nozzles with the external flow. The flow rate, spray angle and drop size were measured under various conditions of the injection pressure. Numerical simulations were attempted to investigate the internal flow structure in the elliptical nozzles, because the experimental study was limited in its measurements of flow velocity and pressure distributions in the relatively small orifice. In the case of the elliptical nozzles, the disintegration characteristics of the liquid jet were significantly different from those of the circular nozzle. Surface breakup was observed at the jet issued from the elliptical nozzles with injection pressure. This is due to the internal flow structure, which is reattached to the orifice wall at the minor axis plane of the elliptical nozzle, unlike that observed with the circular nozzle.

키워드

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