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Change in acoustic impulse response of a room due to a fire
Mustafa Z Abbasi1, Preston S Wilson1, Ofodike A Ezekoye2
1Applied Research Laboratories and Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
Abstract:
A room fire creates temperature gradients and inhomogeneous time varying temperature, density, and flow fields. Experimental measurements of the room acoustic impulse/frequency response are presented and compared with a ray traced model. 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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