Statistical analysis of pressure characteristics of underwater self-excited pulse jet
GAO Chuanchang1, HU Yiwei1*, LI Huan1, MA Wenliang2
1.School of Electric Power, North China University of Water Conservancy and Hydropower, Zhengzhou, Henan 450011, China; 2.Jilin Dunhua Pumped Storage Limited Company, Dunhua, Jilin 133700, China
Abstract:In order to obtaine the optimal ratio of the nozzle structure parameters of the underwater self-excited suction pulsed jet, taking the self-developed self-excited suction jet nozzle as study object, based on the theory of the mathematical statistics, the mean square error, pulsating pressure peak and time-averaged pressure from the pulsating pressure test data of underwater self-excited suction pulsed jet with the change of nozzle area ratio, cavity ratio and cavity length ratio were analyzed. The optimal ratio of the nozzle structure parameters of the underwater self-excited suction pulsed jet was obtained. When the confining pressure is less than 0.4 MPa, the upper and lower nozzle area ratio range is 1.96-4.84, the optimal range is 1.96-4.00. When the confining pressure is less than or equal to 0.2 MPa, the cavity length is 2.8-4.4, the optimal value is 3.4, the cavity length ratio is 1.50-1.65 or 2.20-2.30, and the optimal range should be 1.50-1.65.
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