Numerical Simulation And Experimental Study Of The Water Mist Combined Multi-nozzles

Fire loss of life and property caused by people is huge immeasurable, fire service means "responsibility is extremely heavy," the world’s governments and the scientific community are committed to the research and development of new firefighting techniques. Therefore, scholars have been working on a new type of fire-fighting technology, hoping the new fire extinguishing technology can achieve high efficiency, but also had no effect on the environment requirements. After the signing of the Montreal Protocol in 1989, government and academia have been trying to find an alternative Halon fire extinguishing agent technology, hoping to find a safe and sound environment friendly fire extinguishing technology, water mist fire protection technology is representative of the development direction.At present, research is focused on extinguishing mechanism and structural optimization of single nozzle water mist fire suppression sprinklers, the less reported by the literature search of water mist fire suppression sprinklers combined research. Due to the complexity of the type of fire and particularity, conventional single nozzle water mist fire suppression sprinklers have been unable to adapt to their. For example, in the program-controlled switches, computer rooms and other electrical environment, current conventional single nozzle presence of water mist fire extinguishing sprinkler slow, water consumption and other issues, but also cause water overflow, the formation of secondary damage to the protected object. Therefore, in order to better promote the development of water mist fire suppression technology in our country, to carry out multi-nozzle water mist fire suppression sprinklers combined numerical simulation and experimental study has important significance. Combined multi-nozzle water mist fire suppression sprinkler nozzle structure using five composite structures, used for straight swirl nozzle structure mist nozzle combination. In order to reduce the pressure loss of the subject modular multi-nozzle water mist fire suppression sprinklers, and therefore in the structural design, the need for multi-nozzle water mist fire sprinkler compact modular structure; also need to ensure that when the spray nozzle between each other is not will produce a fine mist interference, otherwise it will affect the formation of droplets and mist of fragmentation. Nozzle structure is the central axis of the nozzle arrangement, the auxiliary nozzle to the center of a circle of circumferentially spaced nozzles.This article dedicated to the research and design of modular multi-nozzle water mist fire suppression sprinklers, while structural optimization design based on flow analysis using the FLUENT software sprinklers were in 3MPa, 5MPa, 7MPa, 9MPa pressure and other conditions were simulated analysis, while a cold laboratory experiments atomization performance by analyzing the test results of cold fog, and the results were compared with the results of numerical simulation analysis, multi-nozzle mist modular structure of the cyclone within good atomization fire sprinkler main features atomization nozzle atomization performance parameters and design are expected to range.