室内火灾声传播的射线追踪和有限元模拟
Ray tracing and finite element modeling of sound propagation in a compartment fire
摘要：
室内火灾（房间或建筑物中的火灾）会产生温度梯度和不均匀的时变温度、密度和流场。这项工作比较了实验测量的房间声学脉冲/频率响应在一个房间内的火灾数值模拟响应。火灾模拟使用火灾动力学模拟器（FDS）。声学建模使用FDS计算的温度场进行。COMSOL Multiphysics用于有限元声学建模，Bellhop用于射线跟踪声学建模。结果表明，火灾导致波前到达更早（由于更高的声速），并与更多的延迟时间的变化（由于声速扰动）。频率响应表明，模式在频率上向上移动，并且高频（>2500 Hz）模式显著衰减。模型结果与数据进行了比较，并在观察到的趋势显示出良好的一致性。
英文摘要：
A compartment fire (a fire in a room or building) creates temperature gradients and inhomogeneous time-varying temperature, density, and flow fields. This work compared experimental measurements of the room acoustic impulse/frequency response in a room with a fire to numerically modeled responses. The fire is modeled using Fire Dynamics Simulator (FDS). Acoustic modeling was performed using the temperature field computed by FDS. COMSOL Multiphysics was used for finite element acoustic modeling and Bellhop for ray-trace acoustics modeling. The results show that the fire causes wave-fronts to arrive earlier (due to the higher sound speed) and with more variation in the delay times (due to the sound speed perturbations). The frequency response shows that the modes are shifted up in frequency and high frequency (>2500 Hz) modes are significantly attenuated. Model results are compared with data and show good agreement in observed trends.
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