Research & Manufacture On Multi-Function Automatic Pressure Control Fire-Fighting Nozzle And Fire Suppression Experiment With Water-Mist

Fire-fighting nozzle is one of most important equipments which are used by fireman in fighting fires. Nozzle can transform pressure into kinetic energy, and provide various stream and water-mist to put out a fire, jet cooling, heat insulation. The conversational nozzle used today in the fire company is with less function, huge nozzle reaction. If the water supply conditions change, conversational nozzle cannot supply a proper stream. Multi-function automatic pressure control fire-fighting nozzle is designed by the principle of automatic pressure control in hydraulic, it can control the flow without creating turbulence, and reduce the nozzle reaction. It can also release stream and water-mist for fire-fighting.In chapter 1, the history of Fire-fighting nozzle is introduced. The advantages and disadvantages of conversational nozzle are presented, and the way to deal with these disadvantages is discussed. The development trend and application status of multi-function automatic pressure control fire-fighting nozzle are introduced. At last, the significance of research and manufacture on Multi-function Automatic pressure control fire protection nozzle and the contents of the thesis are put forward.In chapter 2, the parameters and its effect to spraying of nozzle are introduced, and the characters of stream are described.In chapter 3, working and atomization theory of automatic pressure control nozzle is analyzed. Base on this, an automatic pressure control nozzle is designed. The flow of nozzle is calculated in FLUENT. The multi-function automatic pressure control fire-fighting nozzle can produce lower nozzle pressure to conversational nozzle is proved.In chapter 4, spray experiment of automatic pressure control nozzle indicates that the nozzle can provides a satisfactory stream of water even under bad water supply conditions.In chapter 5, using Three-Dimensional Phase Doppler Particle Anemometer (3D-PDPA), water spray's outlet atomization characteristics at one-meter section is measured. And the water mist's Sauter Mean Diameter produced by a series of nozzles under rated working condition is less than 100μm. We experimented according to other standard fire-fighting experiment, which indicates that the system can put out a fire caused by solid or liquid rapidly with less water, minimal water losses. If we experimented with improved assembled nozzle, water-mist fire suppression system can put out a fire caused by liquid a fire immediately.