关键词: 爆破粉尘时空分布, 开放性粉尘, DPM 模型分析, 局部空气质量分析, 冲击气流

Abstract: The impact airflow generated by the demolition of a building carries dust into the atmosphere，thus affecting its quality. In this study，a dispersion box model for the dust generated by high-rise building demolition was established，combining the gas-solid twophase flow model and using the computational fluid dynamics（CFD） method to simulat and analyze the directional transfer of dust during controlled demolition on different environmental wind speeds and flow regimes. The results showed that the movement of shock wave vortices was related to the flow regime，with vortices forming and moving faster under turbulent flow conditions compared to laminar flow conditions. The propagation vortices played a crucial role in the transport of dust. Under the combined influence of the propagation vortices and the bottom base vortices，80% of the demolition dust on the lee side was entrained into the vortices，with lower dust mass concentrations at the center of the vortices compared to the edges. The demolition dust moved downwind with the vortex flow， impacting an area approximately 200 meters downwind.

Key words: patiotemporal distribution of blasting dust, open dust, discrete phase model analysis, local air quality analysis, impact airflow