声明
1.1Research background
1.2Objectives, scope and structure of research
1.3Area equipped for irrigation
1.4 Sprinkler
1.5Types of sprinklers irrigation
1.5.1 Impact sprinkler
1.5.2Complete fluidic sprinkler
1.5.3Hand-move sprinkler system
1.5.4Solidset and permanent systems
1.6Equipment and design
1.7Wind drift and droplet evaporation
1.8 Sprinkler hydraulic performance parameters
1.8.1Sprinkler discharge
1.8.2Patterns radius (throwing distance)
1.8.3Water application rate or intensity
1.8.4 Distribution pattern
1.8.5Sprinkler droplet size
1.8.6Sprinkler irrigation uniformity
1.8.7Methods of measuring droplet size distributions
CHAPTER 2:OPTIMIZATION OF THE FLUIDIC COMPONENT OF COMPLETE FLUIDIC SPRINKLER AND TESTING OF THE NEW DESIGNED SPRINKLER
2.1Design of newly dynamic fluidic sprinkler head and working principle
2.1.1Design of the Nozzles
2.1.2Experimental setup and procedure
2.2Results andanalysis of orthogonal tests
2.2.1Comparison of operating pressure and discharge
2.2.1Summary results of the orthogonal test
2.2.2Simulation of water distribution
2.3 Brief summary
CHAPTER 3:NUMERICAL SIMULATIONS AND EXPERIMENTAL STUDY ON INTERNAL FLOW CHARACTERISTIC OF DYNAMIC FLUIDIC SPRINKLER
3.1 Numerical simulation
3.1.1 Mathematical model
3.1.2Rotation speed
3.1.3Grid sensitivity analysis
3.1.4 Boundary conditions
3.1.5 Experimental procedure
3.2Results and discussion
3.2.1Relationship between velocity distribution and nozzle sizes
3.2.2Relationship between velocity and length of the tube
3.2.3Comparison of the numerical simulation, calculated and experimental results
3.2.4Comparison of rotation speed and the nozzle sizes
3.2.5Relationship between rotation speed and length of the tube
3.2.6Effect of internal velocity distribution on hydraulic performance
3.3Brief summary
4.1Structure and working principle of 2d-video distrometer
4.2Experimental procedures
4.3Results and discussion
4.3.1Comparison of water distribution profiles
4.3.2Comparison of computed uniformity coefficient
4.3.3Droplet size distributions
4.3.4Droplet characterization statistics
4.4 Brief summary
CHAPTER 5:DEVELOP A MODEL TO SIMULATE THE EFFECT OF RISER HEIGHT ON ROTATION UNIFORMITY AND APPLICATION RATE OF THE NEWLY DESIGNED DYNAMIC FLUIDIC SPRINKLER
5.1Experimental procedures
5.1.1Evaluation of sprinkler performance
5.1.2Overlap water distribution
5.2Results and discussion
5.2.1Quadrant completion time
5.2.2Deviation in water application intensity
5.2.3Comparison of water distribution profiles
5.2.4 Overlap distribution analysis
5.3 Brief summary
CHAPTER 6:COMPARATIVE EVALUATION OF HYDRAULIC PERFORMANCE OF A NEWLY DESIGNED DYNAMIC FLUIDIC, COMPLETE FLUIDIC,AND D 3000 ROTATING SPRAY SPRINKLERS
6.1Structure and the working principle of three different sprinkler heads
6.1.1Experimental setup and procedure
6.1.2Calculation of combined CUs, droplet sizes, and velocities
6.2Results and discussion
6.2.1Comparison of a radius of throw and coefficient of discharge at different operating pressures
6.2.2Relationship between rotation speed for three different sprinkler heads
6.2.3Comparison of water distribution profiles
6.2.4Comparison of the computed uniformity coefficient
6.2.5Spray distributions in the middle and end of the range
6.2.6 Droplet size distribution
6.2.7 Droplet characterization statistic
6.2.8Droplet velocity distribution
6.3Brief summary
7.1 Conclusions
7.2Recommendations for further research
参考文献
致谢
PUBLICATIONS
RESEARCH PROJECTS
APPENDIX
江苏大学;
