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.

scholarly journals PENGARUH VARIASI MAIN JET NOZZEL PADA SISTEM KARBURATOR TERHADAP UNJUK KERJA MESIN

POROS ◽  
2017 ◽  
Vol 13 (2) ◽  
pp. 51
Author(s):  
Alvinsen Alfonso ◽  
Abrar Riza ◽  
I Made Kartika
Keyword(s):  
Performance Analysis ◽  
Energy Conversion ◽  
Fuel Consumption ◽  
Mechanical Engineering ◽  
Motor Fuel ◽  
Nozzle Diameter ◽  
Fuel Performance ◽  
Maximum Performance ◽  
Load Variations ◽  
Jet Nozzle

Abstract: This study discusses the effect of variations in the diameter of the main jet nozzles on the performance of the motor fuel. Performance analysis covering torque, power and specific fuel consumption (sfc). With the aim to determine the maximum performance that can be generated on any variation of the diameter of the main jet nozzles. At the time of this experiment performed with the engine 4 stroke Honda GX-160, using hydro tool dynamometer and using premium fuel. The data taken is the engine rotation, the force measured on the dynamometer and the time spent fuels. Tests conducted at the Laboratory of Energy Conversion Mechanical Engineering UNTAR Jakarta. Testing is done by providing the machine with a load variation of rotation remains in order to obtain a force on each spin machine with a main jet nozzle diameter variations. Variations rev the engine starts at the minimum rotation until maksimuml with fixed load, variations in the diameter of the main jet nozzles on testing. 

Numerical Study of Flow and Heat Transfer of Impingement Cooling on Model of Turbine Blade Leading Edge

2010 ◽  
Author(s):  
Zhao Liu ◽  
Zhenping Feng ◽  
Liming Song
Keyword(s):  
Heat Transfer ◽  
Turbine Blade ◽  
Numerical Study ◽  
Leading Edge ◽  
Jet Impingement ◽  
Target Surface ◽  
Nozzle Diameter ◽  
Impingement Cooling ◽  
Jet Nozzle ◽  
Blade Leading Edge

In this paper a numerical simulation is performed to simulate the impingement cooling on internal leading edge region, which is stretched by the middle cross section of the first stage rotor blade of GE-E3 engine high pressure turbine, and in the condition that jets flow is ejected from a row of four different diameter circular nozzles. The relative performances of three versions of turbulence models including the RNG κ-ε model, the standard κ-ω model and the SST κ-ω model in the simulation of a row of circle jet impingement heat transfer are compared with available experimental data. The results show that SST κ-ω model is the best one based on simulation accuracy. Then the SST κ-ω model is adopted for the simulation. The grid independence study is also carried out by using the Richardson extrapolation method. A single array of circle jets is arranged to investigate the impingement cooling and its effectiveness. Four different jet nozzle diameters are studied and seven different inlet flow Mach numbers of each jet nozzle diameter are calculated. The influence of the ratio of the spacing of jet nozzle from the target surface to the jet nozzle diameter on impingement cooling is also studied, in case of a constant ratio of jet spacing to jet nozzle diameter in different jet nozzle diameters. The results indicate that the heat transfer coefficient on the turbine blade leading edge increases with the increase of jet Mach number and jet nozzle diameter, the spanwise area weight average Nusselt number decreases with the increase of the ratio of the spacing of jet nozzle from the target surface to jet nozzle diameter, and a lower ratio of spacing of jet nozzle from the target surface to the jet nozzle diameter is desirable to improve the performance of impingement cooling on turbine leading edge.

scholarly journals Jet mixing enhancement of a supersonic twin jet nozzle using rectangular tabs

2021 ◽  
Vol 1114 (1) ◽  
pp. 012048
Author(s):  
P N Ambily ◽  
A K Mubarak ◽  
L Rekha ◽  
P A Abdul Samad
Keyword(s):  
Mixing Enhancement ◽  
Jet Mixing ◽  
Jet Nozzle

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.

scholarly journals Influence of jet discharge velocity profile on CFD simulation of pump-around jet mixing tank

2018 ◽  
Vol 192 ◽  
pp. 03019 ◽  
Author(s):  
Thanwa Jorakit ◽  
Natthanon Phaiboonsilpa ◽  
Apinan Namkanisorn ◽  
Phisan Ponpo ◽  
Eakarach Bumrungthaichaichan ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Cfd Simulation ◽  
Velocity Profiles ◽  
Mixing Times ◽  
Jet Mixing ◽  
Discharge Velocity ◽  
Nozzle Configuration ◽  
Jet Nozzle ◽  
Mixing Patterns ◽  
Normalized Concentration

The present paper shows the effect of jet discharge velocity profile (or jet nozzle configuration) on CFD simulation of an open 45° inclined side entry pump-around jet mixing tank. The CFD model was carefully developed by using appropriate grid arrangement, boundary conditions, and numerical methods. The two different jet discharge velocity profiles, including top hat and fully developed profiles, were simulated by using the inlet mass flow rate of about 0.22 kg·s-1. The overall mixing times and normalized concentration profiles predicted by two different jet discharge velocity profiles were compared with the previous reliable experimental data. The results revealed that the different jet discharge velocity profiles resulted in different jet flow and mixing patterns inside the vessels.

scholarly journals Experiment and simulation study on relationship between diameter of high-pressure water abrasive jet nozzle and cutting capacity

2018 ◽  
Vol 153 ◽  
pp. 05002
Author(s):  
Zhang Yu Xian ◽  
Li Nan ◽  
Wang Hong ◽  
Liu Bin Bin
Keyword(s):  
High Pressure ◽  
Axial Flow ◽  
Nozzle Diameter ◽  
Flow Acceleration ◽  
Pressure Water ◽  
Jet Nozzle ◽  
Experiment And Simulation ◽  
Different Diameters ◽  
Cut Depth ◽  
Cutting Capacity

High pressure water abrasive jet nozzle is key part of the particles acceleration. The diameter of nozzle has important effect for jet fluid. Through experiment and simulation explore the relationship between nozzle diameter and jet fluid cutting capacity. The result indicate: ①the cut depth and broad reduced in linearly relationship with the diameter of the jet nozzle. ②In same pressure, decrease the nozzle diameter will reduce the cutting ratio energy; ③The acceleration and attenuation of the nozzle axial flow in different diameters are basically consistent, The smaller nozzle diameter, The flow acceleration will slower, the attenuation will faster, the is velocity core segment will shorter and the cutting ability will lower;Consider from energy consumption, cutting efficiency and other factors, for common material cutting the nozzle preferred diameter is: 0.6~1.0mm, it’s unfavourable to select the 0.2mm diameter

Electromechanical composite brake control for two in-wheel motors drive electric vehicle with single motor failure

2019 ◽  
Vol 234 (4) ◽  
pp. 1057-1074
Author(s):  
Lipeng Zhang ◽  
Zhaowen Pang ◽  
Sheng Wang ◽  
Silong Zhang ◽  
Xinmao Yuan
Keyword(s):  
Control Theory ◽  
Electric Vehicle ◽  
Control Method ◽  
Stability Control ◽  
The State ◽  
Slip Angle ◽  
Bench Test ◽  
Single Motor ◽  
Motor Failure ◽  
Electromechanical Brake

To solve the security control problem of two in-wheel motors front-drive electric vehicles with single motor failure, an electromechanical composite brake control method based on the normal working motor and the electromechanical brake systems is proposed. First, the electromechanical brake system model is established and the brake characteristics is verified by bench test. Then, based on the electric vehicle model and the in-wheel motors model that has been verified by a vehicle test, the instability mechanism of the vehicle with single motor failure is analyzed. Next, taking the yaw rate and the side-slip angle as the state variables, an in-loop controller based on model predictive control theory is designed; taking the yaw angle as the state variable, an outer-loop controller based on fuzzy proportional integral derivative control theory is designed. Finally, the expected stability control is achieved by the distribution of four-wheel brake torque. According to the research, compared with the simple drive motor torque following and motor regenerative brake control, the electromechanical composite brake control can enable the vehicle to offset the effects of instability torque more quickly, so that the vehicle can follow the expected motion trajectory basically and improve the vehicle stability.

Experimental study on double-stage on-line jet mixing apparatus

2021 ◽  
pp. 2142001
Author(s):  
Zhigang Chen ◽  
Pengcheng Wang
Keyword(s):  
Agricultural Production ◽  
High Efficiency ◽  
Single Stage ◽  
Mixing Ratio ◽  
Jet Mixing ◽  
Flow Mixing ◽  
Depth Study ◽  
On Line ◽  
Mixing Method ◽  
Jet Nozzle

With the accelerated development of agricultural intelligence and mechanization, the traditional premixed pesticide mixing method has been unable to meet people’s needs for safe, environmental and efficient agricultural production. Therefore, an in-depth study on a variety of new pesticide mixing methods has been conducted at home and abroad. The single-stage on-line jet mixing method has been increasingly used because of its advantages of safety and high efficiency, which, however, proved to have some disadvantages such as difficulty in controlling the pesticide mixing ratio and poor mixing uniformity. In this experiment, a set of double-stage online jet mixing apparatus was designed to solve some shortcomings of single-stage online jet mixing apparatus, and the influence of jet nozzle parameters in the main jet mixing apparatus and the radiation flow mixing apparatus on the final pesticide mixing effect were studied for this apparatus, and the most appropriate jet nozzle parameters were selected.

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