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정의헌 空軍士官學校 1999 論文集 Vol.44 No.-
A method is developed to include the effect of volume expansion in the description of the flame dynamics using G-equation. line volume-source is used to represent the effect of the exothermic process of combustion with source strength determined by the density difference between the burned and the unburned region. Volume expansion adjusts the flow field to accommodate the increased volume flow rate crossing the flame front. The method was applied to study the interaction of vortex and premixed flame. Increased volume expansion did not change the initial growth rate of flame area. However the residence time and flame surface area increased with higher expansion ratios.
체적팽창효과를 고려한 예혼합화염과 와동의 상호작용에 관한 연구
정의헌,권세진,Chung, Eui-Heon,Kwon, Se-jin 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.12
A method is developed to include the effect of volume expansion in the description of the flame dynamics using G-equation. Line volume-source is used to represent the effect of the exothermic process of combustion with source strength assigned by the density difference between the burned and the unburned region. The present model provides good agreement with the experimental results. Including volume expansion, the flow field is adjusted to accommodate the increased volume flow rate which crossing the flame front and the result predicts the same behavior of measured velocity field qualitatively. The effect of increasing volume expansion does not change the initial growth rate of flame area but increase the residence time. Consequently this effect increases the maximum area of flame front. The flame propagation in varying flow field due to volume expansion provides a promising way to represent the wrinkled turbulent premixed flames in a numerically efficient manner.
체적팽창효과를 고려한 예혼합화염과 와동의 상호작용에 관한 연구
정의헌,권세진 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
A method is developed to include the effect of volume expansion io the description of the flame dynamics using G-equation. Line volume-source is used to represent the effect of the exothermic process of combustion with source strength determined by the density difference between the burned and the unburned region. Volume expansion adjusts the flow field to accommodate the increased volume flow rate crossing the flame front. Test result predicted the measured velocity field qualitatively. The method was applied to study the interaction of vortex and premixed flame. Increased volume expansion did not change the initial growth rate of flame area. However, the residence time and flame surface area increased with higher expansion ratios.
시변시간지연을 가지는 네트워크 기반 시스템의 상태궤환 안정화
정의헌,서영수,이홍희 대한전기학회 2004 전기학회논문지 D Vol.53 No.11-D
When investigating a control problem for network based control systems, the main issue is network-induced delay. This delay can degrade the performance of control systems designed without considering the delay and even destabilize the system. In this paper, we consider the stabilization of network based control systems, where there is bounded time-varying delay. This delay is treated like parameter variation of a discrete time system. The state feedback controller design is formulated as linear matrix inequality. Finally, we show that the stability of control systems designed with considering the delay is superior to that is not so.