Abstract:The wall-attachment radius and distance as function of offset ratio were deduced by using attachment point model and control volume model. A late the wall-attachment radius and the distance of computer program was written and applied to calcufluidic component of fluidic sprinkler controlled by clearance typed 10PXH and 30PXH. The calculating result coincides with the actual size of sprinkler approximately, which indicates that the calculating method could guide the geometric design of fluidic component. The flow in the core area of fluidic component is analyzed with Kimura's model. The calculating results show that the wall-attachment takes place inside the core area of jet flow in the fluidic component.