scholarly journals Research on Resonance Mechanism and Collaborative Optimization of Double-cavity Self-Excited Oscillating Pulse Cavitation Jet Nozzle

2021 ◽  
Author(s):  
xiaoming yuan ◽  
Li Wang ◽  
Weidong Wang ◽  
Lijie Zhang ◽  
Yong Zhu
Keyword(s):  
Flow Field ◽  
Cavity Length ◽  
Nozzle Diameter ◽  
Collaborative Optimization ◽  
The Self ◽  
Inlet Pressure ◽  
Excited Oscillation ◽  
Jet Nozzle ◽  
Oscillation Pulse ◽  
Peak Value

Abstract The peak value and pulsation amplitude of the self-excited oscillating pulse cavitation jet nozzle are important indexes to evaluate the jet performance. It is of great significance in theory and engineering practice to predict the peak value of the self-excited oscillating pulse cavitation jet nozzle accurately. In order to investigate the evolution mechanism of the inner and outer flow field of a double-cavity self-excited oscillation pulse cavitation jet nozzle, a simulation model of the jet impact test of the nozzle was established. Before entrance rounded corners, former cavity cavity diameter, cavity cavity length, before the cavity under the nozzle diameter, cavity, the cavity cavity after entry the rounded, lumen diameter, cavity length and cavity after cavity under the nozzle diameter as design variables, and strike force to combat force peak pulse amplitude as the target variable, the orthogonal experiment method, back propagation neural network combined with non dominated sorting genetic algorithm, The collaborative optimization design method of self-excited oscillating pulse cavitation jet nozzle was determined. Based on the collaborative optimization results, the 3D printing technology was used to manufacture the visualization test model of the flow field of the self-excited oscillating pulse cavitation jet nozzle, and the experimental verification was carried out. The results show that when the inlet pressure is 2MPa, the main and secondary order of the influences of various factors on the jet performance of the nozzle is the nozzle diameter under the front cavity, the diameter of the back cavity, the diameter of the front cavity, the length of the front cavity, the nozzle diameter under the back cavity, the cavity distance, the fillet of the back cavity, the fillet of the front cavity and the length of the back cavity. Compared with the optimal result of orthogonal test, the amplitude of impact pulsation and the peak value of impact force are increased by 14.61% and 2.42% respectively. The optimal structure of the nozzle determined by collaborative optimization can produce obvious pulse cavitation jet, and the cavitation region of the nozzle cavity contracts periodically with time. The higher the inlet pressure, the higher the cavitation intensity and the higher the content of hollow bubble. This study can promote the development of jet performance calculation of self-excited oscillation pulse cavitation jet nozzles, and provide support for the design of self-excited oscillation pulse cavitation jet nozzles.

Erosion Experiment of Self-Excited Oscillation Pulsed Jet

2014 ◽  
Vol 937 ◽  
pp. 614-619
Author(s):  
Chuan Lin Tang ◽  
Jie Pei ◽  
Dong Hu ◽  
Xiao Ting He
Keyword(s):  
Significant Influence ◽  
Cavity Length ◽  
Experimental Studies ◽  
The Self ◽  
Erosion Depth ◽  
Pulsed Jet ◽  
Excited Oscillation ◽  
Erosion Effect ◽  
Erosion Volume ◽  
Peak Value

In order to improve the erosion effect of jet under submergence condition, experimental studies of erosion generated from the self-excited pulsed jet was carried out by using developed self-excited oscillation nozzle. The erosion volume and depth of pulsed jet were measured and taking mortar block as an erosion part. The results were that the standoff has significant influence on erosion effect. The erosion volume firstly decreases with increases in cavity length and then increases to a peak value. Erosion volume of pulsed jet is significantly higher than that of continuous jet, the erosion depth of two jet has slight difference.

Experimental Research on Impact Force and Erosion Effect of Different Hydraulic Pressure

2011 ◽  
Vol 295-297 ◽  
pp. 1866-1871
Author(s):  
Chuan Chang Gao ◽  
Li Zhao ◽  
De Fang Ma ◽  
Xin Yang Liu
Keyword(s):  
Impact Force ◽  
The Self ◽  
Hydraulic Pressure ◽  
Jet Impact ◽  
Excited Oscillation ◽  
Erosion Effect ◽  
The Impact ◽  
Erosion Volume ◽  
Oscillation Pulse ◽  
Pulse Jet

Experiments were conducted for the impact force and erosion volume of the continuous jet, the self-excited aspirated pulse jet, the self-excited oscillation pulse jet on different hydraulic pressure in this paper. The rules of the three kinds of jet impact force and erosion effect with the change of hydraulic pressure were analyzed. The result shows the center impact force of the continuous jet is bigger than the other impact force. The self-excited aspirated pulse jet is obviously superior to the continuous jet and its erosion volume is 1.15~1.3 times as big as the continuous jet.

Study on the Frequency Characteristic of Self-Excited Oscillation Pulsed Water Jet

2011 ◽  
Vol 317-319 ◽  
pp. 1456-1461 ◽  
Author(s):  
Chuan Lin Tang ◽  
Dong Hu ◽  
Feng Hua Zhang
Keyword(s):  
Oscillation Frequency ◽  
Oil And Gas ◽  
Cavity Length ◽  
Water Jet ◽  
Experimental Result ◽  
Pressure Amplitude ◽  
Excited Oscillation ◽  
Pump Pressure ◽  
Pulsed Water Jet ◽  
Peak Value

The self-excited oscillation pulsed water jet (SEOP Jet ) has been used extensively in oil and gas well drilling, mineral mining, cutting and industrial cleaning. In order to improve the valid stand-off distance of water jet pressure and its range of action, the model of oscillation frequency of jet was given on the basis of hydroacoustics and fluid dynamics for better understanding the principle of increasing jet pressure amplitude. The SD150test system was used to analyze the effects of dynamic parameters on the frequency, the effects of pump pressure and the cavity length on the frequency were studied in detail. The test results showed that the peak value of the SEOP Jet is larger by about 20% than that of continuous jet. The oscillation frequency increased while increasing pump pressure and decreased while increasing cavity length. There was an optimum cavity length corresponding to the pressure peak value of the SEOP Jet. Experimental result is in good agreement with that of theoretical analysis.

Experimental Study on Device Parameters of Self-Excited Pulsed Jet to the Performance

2011 ◽  
Vol 90-93 ◽  
pp. 2649-2653
Author(s):  
Chuan Chang Gao ◽  
Ming Lei Yang ◽  
Xin Yang Liu
Keyword(s):  
Cavity Length ◽  
Nozzle Diameter ◽  
The Self ◽  
Testing System ◽  
Operating Parameters ◽  
Optimal Range ◽  
Working Pressure ◽  
Pulsed Jet ◽  
Increasing Trend ◽  
Length Changes

In order to study the influence of the structural and operating parameters on device performance of the self-excited pulsed jet in low-press and Amount-flux, a great deal of experiments on structural and operating parameters of the self-excited pulsed jet was carried out by independently developed testing system. Under the certain upper nozzle diameter and cavity diameter, the changes of the lower nozzle diameter and cavity length and working pressure have an effect on the hitting power of the pulsing jet and pulsing effect. Experimental results showed that for the different lower nozzle diameter and under each working pressure the influence of the cavity length changes on the hitting power is different, there is the optimal range of cavity length and working pressure while the lower diameter is fixed, and with the increase of the lower nozzle diameter, the range of the optimal cavity length and working pressure also has a gradually increasing trend.

scholarly journals Investigation of the Jet Characteristics and Pulse Mechanism of Self-Excited Oscillating Pulsed Jet Nozzle

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1423
Author(s):  
Si Zhang ◽  
Biwei Fu ◽  
Lin Sun
Keyword(s):  
Oscillation Frequency ◽  
Cavity Length ◽  
Peak Velocity ◽  
Inlet Pressure ◽  
Pulsed Jet ◽  
Oil Storage ◽  
Reflection Angle ◽  
Excited Oscillation ◽  
Jet Characteristics ◽  
Pulse Jet

Self-excited oscillation pulse jet technology is widely used to clean sediment from oil storage tanks. Its successful application is dependent on jet performance. As the cleaning requirements of the oil industry increase, it is necessary to optimise the structure of self-excited oscillation pulsed jet nozzles (SOPJNs) to optimise cleaning and energy efficiencies. In this study, the jet performance of a SOPJN is modelled and analysed based on computational fluid dynamics with consideration of a large eddy simulation and homogeneous cavitation. The modelling results are highly consistent with experimental results. The effects of the SOPJN’s inlet diameter, cavity diameter, cavity length, wall reflection angle, and inlet pressure on the jet’s peak velocity, oscillation frequency, and cavitation number were analysed. The results show that the oscillation frequency decreases with the increase of the inlet diameter d1, cavity diameter D, cavity length L and reflection angle of wall α. Optimisation of the SOPJN inlet diameter, cavity length, and wall reflection angle produced a jet with a high peak velocity and strong cavitation. The optimal nozzle cavity diameter strengthens cavitation, while the peak velocity fluctuates as the cavity diameter increases. The peak velocity increases with the inlet pressure, while the increasing rate of the peak velocity decreases. The results of this study can be used in the design and optimisation of similar nozzle structures for improved pulse jet cleaning.

Oscillation Mechanism Analysis and Numerical Simulation for Tandem Self-Excited Oscillation Pulsed Jet Nozzle

2013 ◽  
Vol 448-453 ◽  
pp. 3449-3453 ◽  
Author(s):  
Qin Li ◽  
Wei Sha ◽  
Fu Bao Li ◽  
Shu Yi Xiao
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Helmholtz Resonator ◽  
Mechanism Analysis ◽  
Pulsed Jet ◽  
Oscillation Mechanism ◽  
Excited Oscillation ◽  
New Ideas ◽  
Jet Nozzle ◽  
Organ Pipe

Self-excited oscillation pulsed jet is the new jet which is superior to the traditional continuous jet. In view of the insufficiency of the widely used organ pipe and Helmholtz resonator at present, firstly, with the actual needs of production as the background, a tandem Self-excited oscillation pulsed jet nozzles is presented in this paper. Then on the basis of previous studies, some new ideas are put forward after the cavity Self-excited oscillation mechanism is analyzed theoretically. Finally, numerical simulation of the nozzle flow field is carried out using FLUENT, then ideal pressure distribution contours and the streamline of the flow field are got, verifying the analysis of the oscillation mechanism.

Study on the Working State of Jet-Mixing Apparatus

2014 ◽  
Vol 563 ◽  
pp. 219-223
Author(s):  
Jing Ma ◽  
Bai Jing Qiu ◽  
Run Yan ◽  
Bei Fen Zhu
Keyword(s):  
The State ◽  
Nozzle Diameter ◽  
Bench Test ◽  
Jet Mixing ◽  
Spray System ◽  
Jet Nozzle

In order to study the working state of the export of jet-mixing apparatus under different loads,by comparing the bench test and its application in spray system, the working state of jet-mixing apparatus is studied.The results show that, in the bench test, the export of jet-mixing apparatus is unloaded and the state of jet-mixing apparatus is absorbing pesticide; the jet nozzle whose diameter is 2mm and suction chamber whose diameter is 3mm of the jet-mixing apparatus produce a large number of bubbles, the suction chamber emerges cavitation. The export of jet-mixing apparatus is connected with the F110 spray system, the working state of jet-mixing apparatus with a 2mm diameter jet nozzle is sucking pesticide; the working state of 3mm and 4mm jet nozzle diameter is reflux. The export of jet-mixing apparatus is connected with the outlet of F110 spray system suction chamber.They do not emerge cavitation. The load on the export of jet-mixing apparatus affect the working state of jet-mixing apparatus, also has certain influence on cavitation in the suction chamber.

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