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Analysis and Experimental Study on Incipient Cavitation within Jet Pumps

Author: CaiBiaoHua
Tutor: LongXinPing
School: Wuhan University
Course: Fluid Machinery and Engineering
Keywords: Jet Pump Cavitation inception Newborn Cavitation Cavitation parameters
CLC: TH38
Type: Master's thesis
Year: 2005
Downloads: 301
Quote: 8
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Abstract


The main work of this paper : from macro summarizes affect factors of cavitation newborn ; Second, the mechanism of cavitation inception , combined with the jet pump control equation derived newborn judgment formula ; , jet pump the cavitation inception pilot study and made a corresponding analysis . Devoted a jet pump cavitation parameters of the problem . The paper is divided into six chapters, the main contents are as follows : the first chapter, the background and content of the subject . The second chapter from a macro point of cavitation . Involving many the cavitation study of classic problems , such as liquid tensile strength , gas and nuclear size , scale effect . Chapter based on changes in the boundary layer of fluid mechanics basic theory and turbulent jet characteristics derived expressions of cavitation inception . Including fluctuating pressure , when both the pressure and the critical pressure of the cavitation inception and cavitation inception relations and other issues . Chapter IV of transparent jet pump cavitation inception turned into a test observations and data research . Experiment calculated data show that many factors affect the jet pump cavitation inception , including pressure and flow rate , suction pressure , area ratio . Also found that by observing the jet pump in the presence of two types of cavitation inception , that the pressure cavitation inception and speed of new-born , by pressure reduction and increase in the relative speed of the two different causes . The fifth chapter is dedicated to explore the parameters of the jet pump cavitation inception . First, a list of parameters of the existing variety of cavitation ; then compared by two more representative parameter , σ value of the cavitation coefficient is more stable, but due to its difficult to measured and calculated unsuitable for judging the occurrence or non-occurrence of cavitation . And q_k easy to calculate , and more suitable for use to determine the occurrence of cavitation . Finally, a process for the associated flow ratio and pressure than the cavitation coefficient . Chapter VI made ??a summary of the full text and summarized , and future research directions are also prospected .

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