可燃混合気渦の中を伝わる火炎の数理的研究 : 第1報, 新しい高速火炎伝ぱ機構の提案

概要

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Physical insight is cast to the experimental documentation that a flame propagates at high speed within a vortex tube filled with a flammable gas mixture, A prototype model used for this purpose is the Rankine type vortex with the core region and free-vortex regions being occupied by the flammable gas and an inert gas, respectively. The infinite vortex is ignited at the central cross section so that two flame surfaces propagate in the opposite directions. It is shown that the spiraling of axial vortex filaments caused by the presence of flame (volumetric source) generates the azimuthal vorticity distributions at the shoulders of the flames, which induces the axial velocity at the flame tip thus enhancing the flame propagation speed proportional to the vortex strength. An explicit expression for steady flame tip propagation speed is derived in a general frame work from the requirement of single-valued pressure field on account of three-dimensional flow structure, which yields good agreement with experimental data. The analysis is also applied for other related problems of interest.
一般社団法人日本機械学会の論文
1999-09-25