Pulse water distributor is a kind of important equipment in the biological filter. The rationality of the design is very important to the treatment effect of the sewage. Only uniform water distribution, in order to give full play to the role of each part of the filter and improve the processing capacity of the filter. So far, many domestic and foreign water distributor is still using the traditional porous structure, easy to plug, hole machining complex, head loss calculation and the complicated water distribution device exists poor adaptability of spray hole porous water distribution device, can not control etc.. To solve a series of problems that exist in the porous water distributor, we put forward a new arms single hole distribution device, it is updated by the original porous water distribution for single hole distribution, introduces the central rotating pipe and a water distributing horizontal tube can be controlled, and with the water flow model, such as cloth cloth water from the model, the equivalent linear model and uniform area spraying model, makes the water distributor model in units of a water distribution area of the water cycle equal cloth. The reasonable nozzle structure and the distribution of water distribution play a key role in the uniformity of water distribution and water distribution efficiency. Based on the jet theory, the nozzle design, the nozzle has the contraction section, transition section and diffusion section is put forward, which is the entrance angle determines the main factors of nozzle flow resistance, and the diffusion angle and the diffusion length of a greater impact on the flow characteristics of nozzle; secondly, divide the two-dimensional model grid in Gambit. Choose the standard k-e model and separate solver, set the boundary conditions, using the fluid dynamics software FLUENT to investigate the influence of nozzle with different parameters on water distribution effect, respectively, the axial velocity on the flow field of dynamic pressure, radial velocity, turbulent kinetic energy and other factors were analysis, numerical simulations show that the flow in the system 10m3/d, flow velocity 0.8m/s, the diffusion angle of 30 degrees, the diffusion length is 15mm the nozzle water distribution effect is ideal, so it is necessary to provide entrance pressure nozzle is 1.99 * 105Pa, the surface of the filter media From the nozzle entrance is about 170mm; at the same time the structure and motion parameters of water distribution system was calculated, and the use of Adams simulation of water distribution pipe relative to the movement of several central rotating pipes, on several different trajectories are compared and analyzed, that "the movement patterns of water distribution are type the most uniform; finally, it made further research direction.
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