Experimental research on performance parameters of a self-excited pulsed jet device

2016 ◽  
Vol 11 (2) ◽  
pp. 348-354 ◽  
Author(s):  
Jun Li ◽  
Yongmei Cao ◽  
Chuanchang Gao ◽  
Weili Liao
Keyword(s):  
Experimental Research ◽  
Cavity Length ◽  
The Self ◽  
Operating Parameters ◽  
Performance Parameters ◽  
Optimal Range ◽  
Working Pressure ◽  
Pulsed Jet ◽  
Nozzle Length ◽  
Areal Ratio

The self-excited pulsed jet is characteristically efficient and inexpensive. To develop an optimal pulsed jet, the structural and operating parameters affecting its peak hitting power were studied. The optimal range of cavity length and diameter, the areal ratio of the bottom and top nozzles, the bottom nozzle length, and the target distance and working pressure were all determined.

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.

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.

Self-Assembly of Single Chain Janus Nanoparticles from Azobenzene-Containing Block Copolymers and Reversible Photoinduced Morphology Transition

2021 ◽  
Author(s):  
Wei Wen ◽  
Aihua Chen
Keyword(s):  
Block Copolymers ◽  
Experimental Research ◽  
Self Assembly ◽  
The Self ◽  
Single Chain ◽  
Morphology Transition ◽  
Janus Nanoparticles ◽  
Assembly Behavior

Self-assembly of amphiphilic single chain Janus nanoparticles (SCJNPs) is a novel and promising approach to fabricate assemblies with diversified morphologies. However, the experimental research of the self-assembly behavior of SCJNPs...

Simple Formulas for Performance Parameters Used in Elastohydrodynamically Lubricated Line Contacts

1989 ◽  
Vol 111 (2) ◽  
pp. 246-251 ◽  
Author(s):  
Ping Pan ◽  
B. J. Hamrock
Keyword(s):  
Film Thickness ◽  
Curve Fitting ◽  
Center Of Pressure ◽  
Operating Parameters ◽  
Performance Parameters ◽  
Practical Applications ◽  
Line Contacts ◽  
Pressure Spike

The film thickness and pressure in elastohydrodynamically lubricated conjunctions have been evaluated numerically for a rather complete range of operating parameters (dimensionless load, speed, and materials parameters) normally experienced in practical applications. From the film thickness and pressure throughout the conjunction a number of performance parameters were evaluated. By curve fitting the data, formulas were obtained that allow easy evaluation of the amplitude and location of the pressure spike, the minimum and central film thicknesses, the value of ρeHe, and the center of pressure.

scholarly journals Experimental Research into Technology of Abrasive Flow Machining Nonlinear Tube Runner

2014 ◽  
Vol 6 ◽  
pp. 752353 ◽  
Author(s):  
Junye Li ◽  
Lifeng Yang ◽  
Weina Liu ◽  
Xuechen Zhang ◽  
Fengyu Sun
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Quality ◽  
Experimental Research ◽  
The Self ◽  
Technological Parameters ◽  
Abrasive Flow Machining ◽  
Overall Performance ◽  
Scanning Electron

In the fields of military and civil uses, some special passages exist in many major parts, such as non-linear tubes. The overall performance is usually decided by the surface quality. Abrasive flow machining (AFM) technology can effectively improve the surface quality of the parts. In order to discuss the mechanism and technology of abrasive flow machining nonlinear tube, the nozzle is picked up as the researching object, and the self-designed polishing liquid is employed to make research on the key technological parameters of abrasive flow machining linear tube. Technological parameters’ impact on surface quality of the parts through the nozzle surface topography and scanning electron microscopy (SEM) map is explored. It is experimentally confirmed that abrasive flow machining can significantly improve surface quality of nonlinear runner, and experimental results can provide technical reference to optimizing study of abrasive flow machining theory.

scholarly journals Applicability of Scaling Approach for Analysis of Pyrolysis and Gasification of Porous Structures Composed of Solid Fuel Particles

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
Aliaksandr Alevanau ◽  
Pawel Donaj ◽  
Weihong Yang ◽  
Wlodzimierz Blasiak
Keyword(s):  
Experimental Research ◽  
Solid Fuel ◽  
The Self ◽  
Porous Structures ◽  
The Best Approximation ◽  
Self Organized ◽  
Volumetric Models ◽  
Fuel Particles ◽  
Kinetics Of ◽  
Reactive Properties

Experimental research on the pyrolysis and gasification of randomly packed straw pellets was conducted with an emphasis on the reactive properties of the shrinking porous structure of the pellets. The apparent kinetics of such pyrolysis was approximated by the random pore, grain, and volumetric models. The best approximation results were obtained with the grain and random pore models. The self-organized oscillations of the pellet conversion rate during pyrolysis were observed. Two complementary explanations of the phenomenon are proposed.

Experimental Research on Ultrasonic Vibration Deep Hole Honing of Titanium Alloy

2011 ◽  
Vol 314-316 ◽  
pp. 1107-1111
Author(s):  
Hong Bing Zhao ◽  
Ying Fei Nan
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Ultrasonic Vibration ◽  
Experimental Research ◽  
High Surface ◽  
The Self ◽  
Deep Hole ◽  
High Surface Roughness ◽  
Low Efficiency ◽  
Better Than

Deep hole honing is the primary way of finishing, the main problems existing now are the low efficiency, high surface roughness, especially in the processing of difficult to cut materials. In this study, the test is on the titanium alloy and uses the self-developed ultrasonic vibration honing equipment. The results show that in the same conditions, the ultrasonic vibration in deep-hole honing can improve the efficiency about 1 times, and meanwhile the surface roughness can reach below 0.8μm, the oilstone is uneasy to block, and the technical effects are better than traditional honing process.

Experimental Study on Dynamic Characteristics of Self-Excited Oscillation Pulsed Jet

2014 ◽  
Vol 937 ◽  
pp. 624-631 ◽  
Author(s):  
Chuan Lin Tang ◽  
Jie Pei ◽  
Dong Hu
Keyword(s):  
Dynamic Characteristics ◽  
Cavity Length ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Pulsed Jet ◽  
Jet Impact ◽  
Result Show ◽  
Excited Oscillation ◽  
Pump Pressure ◽  
Submerged Conditions

The dynamic characteristics of the self-excited oscillation pulsed jet is tested by using pulsed jet impact variable cross-section beam in submerged conditions and make comparison with continuous jet, analyzing the effects of operating parameters and nozzle structure parameters on the dynamic characteristics of the pulsed jet. The result show that the oscillating frequency of jet decreases with the increase of cavity length while increases with the increase of the pump pressure. The energy of pulsed jet has obvious change with different cavity length.

Experimental Reasearch on Grinding Surface Waviness of Engineering Ceramics

2013 ◽  
Vol 770 ◽  
pp. 175-178 ◽  
Author(s):  
Yan Fei Diao ◽  
Yu Guo Wang ◽  
Bin Lin ◽  
Li Jie Li
Keyword(s):  
Experimental Research ◽  
Forced Vibration ◽  
The Self ◽  
Generation Mechanism ◽  
The Other ◽  
Alumina Ceramics ◽  
Surface Waviness ◽  
Zirconia Ceramics ◽  
Engineering Ceramics ◽  
Excited Vibration

In this paper, an experiment has been made to take vibration and surface waviness of two kinds of engineering ceramics ( zirconia ceramics and alumina ceramics) as research targets. The experimental research results show that two kinds of surface waviness are on the workpiece, one is sparse and the other one is dense. It is known that the sparse one is caused by the forced vibration. In order to find out the generation mechanism of the dense one, a further exploration has been made. It shows that the dense surface waviness is caused by the self-excited vibration. Finally, some methods are put forward to reduce the surface waviness.

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