학술논문
안내깃을 가지는 곡관유동에서 발생하는 압력손실에 관한 연구
Document Type
Conference
Source
대한기계학회 춘추학술대회. 2018-12 2018(12):1078-1083
Subject
Language
Korean
Abstract
곡관에서 발생하는 부차손실은 주손실에 비하여 작아서 무시되어져 왔다. 그러나 최근에는 시스템 성능을 올리기 위하여, 부차손실의 감소가 중요한 이슈가 되었다. 곡관유동에서는 유동박리에 의한 2차 선회유동이 발생함으로 관 표면처리만으로 압력손실을 감소시킬 수 없다. 하지만 곡관부에 안내 깃을 설치함으로써 압력손실을 감소시킬 수 있다. 본 연구에서는 안내 깃의 설치 유무에 따른 곡관유동 특성에 대하여 수치해석적으로 조사하였다. 특히, 90°로 굽은 곡관 유동에 초점을 맞추었다. 수치해석을 위하여 k-ω SST 난류모델을 적용한 비압축성 RANS 식을 사용하였다. 또한 레이놀즈수와 안내깃의 영향을 조사하기 위하여 곡관 하류 위치에 따른 속도, 곡면의 압력 및 선회유동의 난류 에너지를 조사하였다. 본 연구의 결과로 안내 깃을 설치함으로써 압력손실이 감소하는 것을 알 수 있었다.
The minor losses in the pipe bend flow are smaller than the major loss like friction loss in the pipe flow and have been ignored. However, in order to increase the system performance in recent years, a reduction of the minor losses has become an important issue. In the pipe bend flow, the pressure loss can not be reduced only by the surface treatment due to the flow separation and the secondary swirling flow. In this study, the pipe bend flow characteristics with or without the guide vane were investigated numerically. In order to investigate the effect of Reynolds number and the number of guide vane, the velocity, curvature pressure and turbulent energy of the swirling flow were investigated at the downstream of the bend flow. As a result of this study, it was found that the pressure loss was reduced by installing the guide vane.
The minor losses in the pipe bend flow are smaller than the major loss like friction loss in the pipe flow and have been ignored. However, in order to increase the system performance in recent years, a reduction of the minor losses has become an important issue. In the pipe bend flow, the pressure loss can not be reduced only by the surface treatment due to the flow separation and the secondary swirling flow. In this study, the pipe bend flow characteristics with or without the guide vane were investigated numerically. In order to investigate the effect of Reynolds number and the number of guide vane, the velocity, curvature pressure and turbulent energy of the swirling flow were investigated at the downstream of the bend flow. As a result of this study, it was found that the pressure loss was reduced by installing the guide vane.