Research On Cavitation Luminescence Of Hydraulic Conical Throttle Valve

In the hydraulic system,there is a luminous phenomenon in hydraulic oil.This phenomenon is due to the pressure of hydraulic oil in the sealed chamber dropping below the air separation pressure or saturated vapor pressure at that temperature,resulting in the separation of gases from the liquid or even the vaporization of the liquid,a large number of bubbles are generated.When the bubbles flow with oil,they flow from low pressure to high pressure,which leads to the bubble being crushed and the bremsstrahlung radiation of the bubble breaking,leading to the generation of luminescence phenomenon.Sonoluminescence is a phenomenon in which bubbles in liquids burst and emit a very short light when they are stimulated by sound.In this paper,the throttle orifice of hydraulic cone valve is taken as the research object,and theoretical analysis and deduction,simulation analysis and experimental research are carried out to explore the influence of different conditions of valve opening size,pressure difference,temperature and viscosity on the luminescence phenomenon,and to improve the theory of cavitation luminescence.Firstly,the theory of cavitation luminescence was found to be similar to the mechanism of acoustic luminescence.The luminescence in hydraulic system can be explored by referring to the research direction of acoustic luminescence.Since it is the luminescence phenomenon caused by bubbles,the theoretical formula derivation in this paper is based on the dynamic equation of bubbles,and the theoretical derivation is made for the changes of pressure,viscosity,temperature and other parameters.Secondly,SolidWorks was carried out for the valve used in the test,and the model was imported into ANSYS for flow field simulation.The cavitation was observed by changing the valve opening size,pressure difference,temperature,viscosity and other conditions.Finally,the test bench was set up,and the conditions such as valve opening size,pressure difference,oil temperature and oil viscosity were respectively changed for experimental study.Observing the change of luminous intensity under different conditions and taking photos with camera,recording the corresponding pressure,flow and temperature test data,drawing the corresponding test curve and analyzing it.The change of luminescence intensity under different conditions was observed,and corresponding test data was recorded.The hydraulic oil used after the test was analyzed to check whether it was deteriorated.This paper mainly explores the phenomenon of cavitation luminescence in hydraulic conical throttle orifice,and explores it by combining theory,simulation and experiment.In the actual test process,the control variable method is mainly used tostudy the different test parameters.It is concluded that the shape of the valve port has no effect on the luminous phenomenon,the luminous intensity increases first and then decreases with the opening of the valve,the pressure difference between the front and back of the valve port increases,the luminous intensity increases first and then remains unchanged with the temperature rising,and the cavitation of the cone valve port in the hydraulic system is summarized.The regularity of luminescent phenomena is analyzed,and the change of luminescent intensity under different conditions and the data of pressure,temperature and flow collected in the experiment are analyzed reasonably.The factors affecting the cavitation luminescent phenomena are summarized and the bubble luminescent theory is perfected.The research in this paper is beneficial to the study of luminous phenomena in hydraulic system.