基于FDS小型可控火旋风试验与数值模拟

Based on FDS small controllable fire whirlwind test and its numerical simulation

为了研究火旋风与池火火焰形态、温度变化之间的差异,利用设计自制的旋风罩小型火旋风发生装置,通过室内正庚烷燃烧试验和FDS数值模拟两种方式,对比分析火旋风与正常池火的火焰形态、温度变化、燃烧速率。研究表明:旋风罩的特殊构造使气体在其中可以形成均匀稳定的旋转流,易于形成火旋风;火旋风火焰燃烧形态比普通油池火剧烈稳定,火旋风的火焰高度和火焰稳定区域均比普通油池火火焰大。

In order to study the differences between the fire whirl-wind and pool fire flame patterns and temperature changes,using a cyclone hood small-scale fire whirlwind generating device designed by ourselves,the flame morphology,temperature change,and burning rate of the fire whirlwind and the normal pool fire were compared and analyzed by the indoor N-heptane combustion test and FDS numerical simulation.The research showed that the spe-cial structure of the cyclone hood makes it possible to form a uni-form and stable swirling flow in the gas,and it is easy to form a fire whirlwind.The fire whirlwind flame combustion pattern is more stable than the ordinary oil pool fire and the flame height and stabil-ity area of the fire whirlwind are larger than the ordinary oil pool fire flame.