• Title/Summary/Keyword: Flame standoff ratio

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Influence of Initial Diameter on the Combustion Characteristics of n-heptane Droplet (초기 직경이 n-heptane 액적 연소 특성에 미치는 영향)

  • Suh, Hyun Kyu
    • Journal of ILASS-Korea
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    • v.18 no.2
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    • pp.94-99
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    • 2013
  • The spherically-symmetric burning of an isolated droplet is a dynamic problem that involves the coupling of chemical reactions and multi-phase flow with phase change. For the improved understanding of these phenomena, this paper presents the numerical results on the n-heptane droplet combustion conducted at a 1 atm ambient pressure in three different initial droplet diameter ($d_0$). The main purpose of this study is to provide basic information of droplet burning, extinction and flame behavior of n-heptane and improve the ability of theoretical prediction of these phenomena. To achieve these, the numerical analysis was conducted in terms of normalized droplet diameter ($d/d_0$), flame diameter ($d_f$) and flame standoff ratio (FSR) under the assumptions that the droplet combustion can be described by both the quasi-steady behavior for the region between the droplet surface and the flame interface and the transient behavior for the region between the flame interface and ambient surrounding.

Study on the Combustion Characteristics of Methanol Fuel Droplet (Methanol 연료 액적의 연소 특성에 관한 연구)

  • Suh, Hyun Kyu
    • Journal of ILASS-Korea
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    • v.19 no.3
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    • pp.109-114
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    • 2014
  • The main purpose of this study is to provide basic information of droplet burning, extinction process and flame behavior of methanol fuel and improve the ability of theoretical prediction of these phenomena. For the improved understanding of these phenomena, this paper presents the experimental results on the methanol droplet combustion conducted under various initial droplet diameters ($d_0$), ambient pressure ($P_{amb}$), and oxygen concentration ($O_2$) conditions. To achieve this, the experimental study was conducted in terms of burning rate (K) with normalized droplet diameter ($d/d_0$), flame diameter ($d_f$) and flame standoff ratio (FSR) under the assumptions that the droplet combustion can be described by both the quasi-steady behavior for the region between the droplet surface and the flame interface and the transient behavior for the region between the flame interface and ambient surrounding.

A Study on the Distortion Caused by Spot Heating with Air Cooling

  • Shin S. B.;Youn J. G.
    • International Journal of Korean Welding Society
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    • v.5 no.1
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    • pp.35-43
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    • 2005
  • This paper deals with the optimum condition for spot heating to correct the thin buckled panel caused by welding. Heat input models for each flame torch tip (500, 800, 2000) with standoff were establish using FEA to evaluate the temperature distribution of the heated plate and verified by experiment. With the heat input models developed for each torch tip, the effect of heating variables including ramp ratio(R) and standoff on the radial shrinkage and angular distortion was identified using FEA. Based on the results, the proper conditions of spot heating with air cooling were established. The amount and distribution of the radial shrinkage by spot heating were formulated as the function of heating variables and in-plane rigidity of the plate.

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Effects of Line Heating Variables for forming the Curved Plate on the Behavior of Distortion (곡가공을 위한 선상 가열 특성에 따른 변형 거동에 관한 연구)

  • Sin, Sang-Beom;Lee, Dong-Ju;Kim, Gyeong-Gyu;Yun, Jung-Geun
    • Proceedings of the KWS Conference
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    • 2005.06a
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    • pp.291-293
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    • 2005
  • The purpose of this study is to evaluate the effects of line heating variables for forming the curved plate on the behavior of distortion using FEA and experiment. The optimum mixed ratio and standoff for flame heating was established under the heating conditions given in this study. With the heating condition, the predictive equation of angular distortion and transverse shrinkage was established using FEA and verified by comparing the predicted results and experimental results.

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