Effect of combustion pressure on regression rate of solid fuel under an impinging oxidizer jet counterflow diffusion flame

スポンサーリンク

概要

• 論文の詳細を見る

• Flame spread and counterflow diffusion flame experiments are widely conducted to investigate the combustibility of solid fuels. Although the use of the gas phase Damköhler number to organize the flame spread rate or regression rate of a solid fuel is effective under constant pressure, some research point out the possibility that the combustion pressure may be an independent factor in determining the regression rate. This research employs a counterflow diffusion flame to investigate the effects of combustion pressure on regression rate, and clarifies the deviation of results using the classical Damköhler number under varying pressures. First, a numerical flow analysis was conducted to determine the oxidizer velocity gradient near the fuel surface, which is an essential factor in evaluating the non-dimensional regression rate. Next, using an enclosed combustion chamber with independently variable oxidizer flux and pressure, experiments with a quasi two-dimensional flame were conducted with polyethylene solid fuel and nitrogen diluted oxygen oxidizer, and the regression rate was measured for two experiment series, constant pressure, and constant oxidizer flux. By comparing the two series, the effect of pressure on non-dimensionalized regression rate is clarified. The results suggest that contrary to the theoretical reaction rate of the gas phase, the non-dimensional regression rate increases when the combustion pressure is decreased, even in the thermal regime. This suggests that the classic method of organizing the regression rate with Damköhler number in thermal regime could not be implemented with varying pressure conditions, possibly due to the change in diffusion rates involved with varying pressures.

• 一般社団法人日本機械学会・社団法人日本伝熱学会の論文

著者

• SAITO Tatsuya

  Division of Cardiovascular Surgery, Hokkaido Cardiovascular Hospital

• NAGATA Harunori

  Division of Mechanical and Space Engineering, Hokkaido University

• Nakamura Yuji

  Division Of Mechanical And Space Engineering Hokkaido University

• MATSUOKA Tsuneyoshi

  Division of Mechanical Engineering, Toyohashi University of Technology

• TERAKAWA Ken

  Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University

• TOTANI Tsuyoshi

  Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University

• NAKAMURA Yuji

  Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University

• WAKITA Masashi

  Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido University

関連論文

• A Comparison of the Acute Phase Cardiac Function Between Septal and Apical Right Ventricular Pacing in Individual Patients
• Induction of Fine Bent-grass Callus and Appearance of Chitinase during the Subculture
• Structural Analysis of the Fundamental Polymer of the Sheath Constructed by Sphaerotilus natans
• CURRENT STATUS OF ROCKET DEVELOPMENTS IN UNIVERSITIES : DEVELOPMENT OF CAMUI HYBRID ROCKET
• Strategy to diagnose ultra-lean (φ
• Delayed Closure of Postinfarction Ventricular Septal Rupture
• Development of “Tiny” Droplet Flame Simulator: “Super-Stabilized” Micro-Jet Flame in a Hot Air
• Flame Spread Behavior in Partial Gravity Fields : For Fire Safety Strategy on Lunar & Martian Environments
• Modeling and Asymptotic Analysis of Combustion of Solid Fuel Deposited over an Inert Porous Medium
• Successful imaging of the preheat zone of a lean (φ
• Numerical Study of Effect of Thermocapillary Convection on Melting Process of Phase Change Material subjected to Local Heating
• Safety Pacemaker Lead Extraction Method Using Forceps (Fujiwara's Method)
• Effect of combustion pressure on regression rate of solid fuel under an impinging oxidizer jet counterflow diffusion flame

もっと見る 閉じる

スポンサーリンク