Numerical Simulation And Experimental Investigation On Trace Quantity Irrigation

Trace quantity irrigation(TQI)technology is the new water-saving one,including two lays of filter menbranes,one with large surface and tiny aperture,the other with small surface and big diameter.In the great scale of field irrigation experiments,all geometry sizes of irrigation pipe and parameters of irrigation system,need plentifully repeated tests,wasting time and cost.But by numerical simulation technology,it is more efficient to analyse the law of pressure and speed fields inside the TQI tubes.Therefor,using finite element analysis to guide the practical field trials can narrow the testing period and save the experiments' costing.This article take the YQI pipe as research objects,applying the ANSYS simula t io n software to found the flowing model,and to explore the flowing law on the condition of changing inlet pressure and emitter distance.After that,conduct experiments and match with the results of simulation.The results say that the experimentation is close to the simulation.And under the same pressure,the output is almost at the same in the TQI tubes with different emitters distance.What's more,the uniformity of water-flowing is very good.Moreover,the outflow of every kind of TQI pipe is increasing with the increase of pressure.Through the results of tests and simulation,build the propriate TQI tubes to simulate the outlet flow law under the different circumstances of permeability,tube diameter,membrane area ratio and aperture ratio.The outlet is decreasing with the decrease of permeability,tube diameter,and capillary diameter,ranging within 1.85 L/h,0.027L/h,0.78 L/h,respectively.And the export is reducing with the rise of the length of capillary by M curve,wihin 0.009L/h.In a word,diminishing the permeability and the length of capillar y,and ascending the tube diameter,the area of filtering membrane and capillary diameter can result to enlarge the the flow out of TQI.