Research On Water Hydraulics Water Mist Fire Suppression System

Water hydraulics has advantages of environmental-friendly, non-flammable, cleanness, safety, readily available, Inexpensive, and easily disposable. It is widely recognized that water hydraulics is a frontier research area and the hotspot of hydraulics research and design. It has wide apply and development potential. Water mist used for fire suppression has advantages of no pollution, high fire extinguishing capability, minimum quantity of water requirements, low water damage and better effect. Since the signature of "Montreal Protocol", Water mist fire suppression system has been in fact widely expected the most potential substitute of the Chlorine- or bromine-based gaseous fire suppressants known as HALON, which has great affection to the ozone layer.Common used water mist system is air-aided two-phase atomization system, which need high-pressure gas container. Combine water hydraulics and water mist fire suppression technology, this paper put the new type of high-pressure direct atomize water mist fire suppression system. It avoids complex assembly of common air-aided atomization system and has longer continuous working time.The main research contents are as follows. A displacement of 20 mL/r water hydraulic nine piston pump is designed. A Portable high-pressure direct atomization water mist fire suppression system is constructed. The national "211 project" fund supported water hydraulic test rig is installed and debugged. Shape selection of high-pressure direct atomize nozzle is carried, and then the nozzle's inner structure parameters" influence to its inner flow status and outlet atomization characteristics is simulated and tested. After such primary experiments, further modification of nozzle is taken. Using Phase Doppler Particle Anemometer apparatus (PDPA), modified nozzle's outlet atomization characteristics includes droplet velocity, droplet Sauter Mean Diameter (SMD) is measured. And high-pressure direct Atomization mechanism is analysized. At last, portable fire-fighting system's international standard A type and B type fire suppression experiment is carried, experimental results show that system has very well fire protection capability. The whole fire suppression system passes the specialist's identification.Concretely, the dissertation's main contributions include.1 The dissertation put forward high-pressure direct atomization way to get water mist for fire suppression. Compared to common air-aided water mist fire suppression system, it has simpler equipment and so its flexibility is greatly enhanced. And this suggestion provides more opportunity for the water mist fire suppression technology from laboratory to the real market.2 The high-pressure direct atomization nozzle is designed and modificated. And PDPA measurement to the modified nozzle is processed. Nozzle's outlet Atomization Characteristics is obtained. On the basis of experimental results, atomization mechanism is discussed. Such discussion supply theoretical method to the design of high-pressure direct atomize nozzle.3 Portable fire suppression system's international standard fire suppression experiment is carried. Experimental results show it has high and quickly fire extinguishing capability, and also minimizes the water usage. Such standard experiments afford forceful engineering data to the high-pressure water mist fire suppression system.