Experimental Study On Parameterized Structure Of Water-saving Emitters Based On RP

Rapid development of water-saving emitter based on rapid prototyping technique can eliminate the necessity of mould making, and accordingly reduce the developing cycle and cost of new emitters. The purpose of this thesis is to realize parameterized structural design of emitter, and lay a preliminary foundation for rapid development of our own sinicized emitters.Eight trapezoid labyrinth flow-channels are designed through modification to the cell dimension and the number of flow cells based on the parameterized structural design. Integral emitter prototypes combining exterior hull and exterior flow-channel are built using rapid prototyping technique, and structural dimension of those flow-channel are measured by optical microscope, the measuring results showed that the design can completely meet the requirement of emitter accuracy. The labyrinth-type emitter can be directly applied to irrigation experiment, the flow rate of 8 emitter prototypes are mensurated under 12 pressure values on the test-bad. Moreover, experimental data are analyzed with multivariable linear regression in MATLAB, formulas of pressure versus flow and regression plots for 8 different emitters are induced from the regression analyses.The conclusion that the more the number of labyrinth is or the smaller the cells are, the more gentle the slope of the plot has been arrived at from the 8 formulas and regression plots. So emitters of high quality can be produced by modification to the cell dimension and the number of flow cells, which provides efficient method for designing parameterized structure of emitters. Furthermore formulas of pressure loss are summarized based on trapezoid cell, this approach may be applied to study the mechanism of dissipative energy in other labyrinth emitters, and those regression formulas are tested through experiments.Flow behaviors of 8 emitters are analyzed by FLUENT, flow channels show good fluidness, but lower flow rate is found in exterior corners of the emitter channel. When exterior corners are designed with circular arcs, the flow behavior is improved to some extend. So Emitter with good fluidness and anti-clogging are developed by the above methods.