Hydraulic performance analysis of pressure-compensating emitters using CFD method

摘要

Pressure-compensating (PC) emitters have been widely used due to their anti-clogging performance and flow stability. The hydraulic performance of PC emitters is determined by the interaction between the elastic diaphragm and the flow field The hydraulic performance experiment cannot reveal the internal flow behavior of PC emitters. The computational fluid dynamics (CFD) method can not only reveal the internal working process of PC emitters but also design PC emitters quickly and accurately. At present, the rapid design method of non-pressure compensating emitters based on CFD method is very mature. However, due to the large deformation of mesh and the two-way coupling interaction between the fluid and elastic diaphragm, the simulation calculation ofPC emitters based on CFD method is very difficult This paper studied the simulation calculation of inline PC emitters based on fluid-structure interaction (FSI) method, and the adaptive mesh was used to repair the deformed grid The results showed that the maximum relative deviation between calculation and experiment result was within 8%. In conclusion, the FSI method can be used in the flow prediction and structure optimization of PC emitters.