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양희천(H. C. Yang),유홍선(H. S. Ryou),정연태(Y. T. Jeong) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.4
The impingement of the fuel spray on the wall within the combustion chamber in compact high-pressure injection engines and on the intake port wall in port-fuel-injection type engines is unavoidable. It is important to understand the characteristics of impinging spray because it influences on the rate of fuel evaporation and droplet distribution etc. In this study, the numerical study for the characteristics of spray/wall interaction is performed to test the applicablity and reliability of spray/wall impingement models. The impingement models used are stick model, reflect model, jet model and Watkins and Park's model. The head of wall-jet eminating radilly outward from the spray impingement site contains a vortex. Small droplets are deflected away from the wall by the stagnation flow field and the gas wall-jet flow. While the larger droplets with correspondingly higher momentum are impinged on the wall surface and then are moved along the wall and are rolled up by wall-jet vortex. Using the Watkins and Park's model the predicted results show the most reasonable trend. The rate of increase of spread and the height of the developing wall-spray is predicted to decrease with increased ambient pressure (gas density).
화재 발생시 연기 거동에 대한 수치해석적 연구 : 아트리움 공간을 중심으로
유홍선,노재성,정연태 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1
The smoke filling process for the atrium space containing a fire source is simulated using two types of deterministic fire models: Zone model and Field model. The zone model used is the CFAST(version 1.6) model developed at the Building and Fire Research Laboratories, NIST in the USA. The field model is a self-developed fire field model based on Computational Fluid Dynamics(CFD) theories. This article is focused on finding out the smoke movement and temperature distribution in atrium space which is cubic in shape. A computational procedure for predicting velocity and temperature distribution in fire-induced flow is based on the solution, in finite volume method and non-staggered grid system, of 3-dimensional equations for the conservation of mass, momentum, energy, species and so forth. The fire model i. e. Zone model and Field model predicted similar results for the clear height and the smoke layer temperature.