Research On The Nozzle Performance Of Self-excited Inspirarory Pulsed Jet

Based on the summary of a great of literature home and abroad, Analysis of thedevice performance and aspirated characteristics of self-excited aspiratory pulsed jetin deepwater condition. Determined the distribution of the jet hitting power,researchand analysis the impacts of dimensionless parameters on the relative jet hitting powerand relative aspiratory,and obtained optimum performance parameters and optimumaspiratory parameters.The results of this research provide the technical support forfurther in-depth studying the efficient self-excited aspiratory pulsed jet technology indeepwater reservoir bottom sediment dredging and other engineering applications.Chapter I outlines the progress of self-excited pulse jet in domestic and foreign.Chapter2compares and analysis the structure and characteristics of submerged jetand non-submerged jet from the water jet theory,as well as analysis the jet forces onobjects. According to the characteristics of the self-excited pulse jet, which expoundits mechanism and working principle.Through the characteristics of submergedjet,Analysis the wave velocity and frequency of self-excited pulsed jet device,thegeneration mechanism of self-aspiratory pulse jet was preliminary distinguished insubmerged jet. Chapter III outlines the self-aspiratory pulse jet device performance indifferent working conditions.Obtain the ratio of parameter of optimum relative jethitting power in non-submerged and deepwater conditions by non-dimensionalmethod.Analysis the percentage of relative jet hitting power in the condition ofaspiratory and not aspiratory.the relationship between parameter ratio (upper andlower nozzle diameter, cavity diameter and the upper nozzle diameter ratio, cavitylength and the upper nozzle diameter ratio, confining pressure and the workingpressure ratio) and relative aspiratory was analyzed by non-dimensional method.Experiment researched and analyzed of the distribution pattern on the jet hittingpower.