障碍物几何参数对离心泵汽蚀特性的影响
作者单位：兰州理工大学
学位级别：硕士
导师姓名：赵伟国
授予年度：2022年
学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理]
摘 要：Hydraulic machinery inevitably encounters cavitation problems during *** hazards of the cavitation process are mainly reflected in three aspects: First,cavitation will lead to serious deterioration of hydraulic performance of hydraulic machinery;second,bubbles can cause damage to the surface of the material known as *** the same time,accompanied by cavitation damage,there are also problems such as vibration and noise;third,cavitation will affect the flow’s unsteady characteristics or dynamic response *** to the dynamic response characteristics can make the flow unstable,and the instability caused by cavitation includes rotational cavitation and cavitation *** instabilities can lead to large oscillations in global flow and pressure,resulting in unsteady rotor dynamics and consequently,structural failure of the hydraulic *** present,the research on unsteady flow instability in hydraulic machinery is in its *** research on flow instability caused by cavitation is a hot and difficult issue in the field of hydraulic *** is almost impossible to completely eliminate the harm caused by cavitation flow instability in the engineering ***,the research direction of cavitation hazards has been adjusted to reduce and suppress the negative effects of cavitation instability,that is,the control of ***,there are measures such as adjusting the pipeline layout,installing asymmetric interference plates,installing circumferential grooves,and air supply for hydro-mechanical cavitation *** methods have a certain inhibitory effect on specific cavitation instability,but the cavitation instability is not completely inhibited,and the mechanism of inhibition is not fully ***,exploring and discovering cavitation instability control theory and technology with practical engineering value is significant for improving the anti-cavitation characteristics,and hydro machi
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