Abstract： Based on the working principle of complete fluidic sprinkler′s fluidic element and its inner flow state,factors that affect the frequency of wall attachment offset jet are analyzed.A calculating formula of frequency is established by the differential pressures on both sides of fluidic element.The wall fluctuating pressures of fluidic element are measured and converted to the experimental data of wall attachment frequency.The calculating results of frequency agree well with the experimental data.Both the experimental data and the calculating results show that the frequency decreases with the signal pipe length and increases with the fluidic element′s cavity volume.The frequency increases with the sprinkler′s working pressure and the flow rate of signal water.As far as the type of PXH30 sprinkler is concerned,the wall attachment frequencies are linear with the flow rate of signal water.The Reynolds number has little influence on the Strouhal number,and the Strouhal number reduces with the Euler number increasing.The study provides the guide for the design of fluidic element and the adjustment of sprinkler′s working state.
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