Abstract: In order to investigate the design parameters of a mobile high-pressure water mist fire extinguishing device in cultural heritage buildings, a 6A wood pile fire test platform was set up to study the suitable jet flow rate and distance for this device to handle large-scale fires under different jet distances and modes. The Fire Dynamics Simulator (FDS) was used to simulate a historical building in Beijing as a model, validating and supplementing the design parameters of the mobile high-pressure water mist fire extinguishing device from aspects such as jet intensity, jet distance, jet timing, and atomization particle size. The results show that the jet intensity can be set at 4.4~6.6 L/（min.m2）; the jet distance can be set to 5 m. A close jet strategy is used whenever possible; the fire extinguishing timing should be as early as possible, at least within 300 s after the fire starts; the choice of atomized particle size needs to be weighed on a case-by-case basis.

Key words: mobile high-pressure water mist fire extinguishing device; cultural heritage buildings; design parameters; fire test; FDS