Structural Optimization and Hydraulic Performance Characteri
发布时间：2023-08-18 16:55
本研究得到了国家重点研究开发项目(编号2016YFC0400202)和江苏省现代农业重点研究开发项目(编号BE2018313)的资助。喷灌设备装置的性能评价过程中用到了很多种性能指标,这些指标均为描述喷灌系统状况和运行状况,并且是可以进行测量的变量或者是可以计算的系数。喷头是影响喷灌质量的关键因素,随着低压喷灌在世界范围内的发展,世界上的发达国家和发展中国家都致力于研究和开发低压高效运行的喷灌用喷头之中。在本研究中,开发出了一种新型结构和新型工作原理的由水力驱动进行旋转的射流式喷头,以改善现有的全射流喷头在低压条件下的水力性能。本研究中在不同工作压力下,对不同类型的喷嘴结构进行了众多的试验研究。本文的主要内容和创新点如下:(1)现有全射流喷头的流体组成结构进行了优化得到新型结构的射流式喷头,并对新型喷头进行了优化组合研究。设计并制造出了一种由水力驱动进行旋转的射流式喷头和系列不同喷嘴直径的样机做为试验对象。本研究中的射流式喷头的重要结构参数包括导管长度、工作压力、导管直径、喷嘴直径,并分别由因子A、B、C和D来进行表示。研究中采用了四因素三水平正交试验设计开展了试验研究,并采用直接分析...
【文章页数】：154 页
【学位级别】：博士
【文章目录】：
ABSTRACT
摘要
CHAPTER 1: INTRODUCTION
1.1 Research background
1.2 Objectives, scope and structure of research
1.3 Area equipped for irrigation
1.4 Sprinkler
1.5 Types of sprinklers irrigation
1.5.1 Impact sprinkler
1.5.2 Complete fluidic sprinkler
1.5.3 Hand-move sprinkler system
1.5.4 Solid set and permanent systems
1.6 Equipment and design
1.7 Wind drift and droplet evaporation
1.8 Sprinkler hydraulic performance parameters
1.8.1 Sprinkler discharge
1.8.2 Patterns radius (throwing distance)
1.8.3 Water application rate or intensity
1.8.4 Distribution pattern
1.8.5 Sprinkler droplet size
1.8.6 Sprinkler irrigation uniformity
1.8.7 Methods of measuring droplet size distributions
CHAPTER 2: OPTIMIZATION OF THE FLUIDIC COMPONENT OF COMPLETE FLUIDIC SPRINKLER AND TESTING OF THE NEW DESIGNED SPRINKLER
2.1 Design of newly dynamic fluidic sprinkler head and working principle
2.1.1 Design of the Nozzles
2.1.2 Experimental setup and procedure
2.2 Results and analysis of orthogonal tests
2.2.1 Comparison of operating pressure and discharge
2.2.2 Summary results of the orthogonal test
2.2.3 Simulation 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
3.1.2 Rotation speed
3.1.3 Grid sensitivity analysis
3.1.4 Boundary conditions
3.1.5 Experimental procedure
3.2 Results and discussion
3.2.1 Relationship between velocity distribution and nozzle sizes
3.2.2 Relationship between velocity and length of the tube
3.2.3 Comparison of the numerical simulation, calculated and experimental results
3.2.4 Comparison of rotation speed and the nozzle sizes
3.2.5 Relationship between rotation speed and length of the tube
3.2.6 Effect of internal velocity distribution on hydraulic performance
3.3 Brief summary
CHAPTER 4: EVALUATION OF HYDRAULIC PERFORMANCE CHARACTERISTICS OF THE DYNAMIC FLUIDIC SPRINKLER
4.1 Structure and working principle of 2d-video distrometer
4.2 Experimental procedures
4.3 Results and discussion
4.3.1 Comparison of water distribution profiles
4.3.2 Comparison of computed uniformity coefficient
4.3.3 Droplet size distributions
4.3.4 Droplet 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 THENEWLY DESIGNED DYNAMIC FLUIDIC SPRINKLER
5.1 Experimental procedures
5.1.1 Evaluation of sprinkler performance
5.1.2 Overlap water distribution
5.2 Results and discussion
5.2.1 Quadrant completion time
5.2.2 Deviation in water application intensity
5.2.3 Comparison 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
6.1 Structure and the working principle of three different sprinkler heads
6.1.1 Experimental setup and procedure
6.1.2 Calculation of combined CUs, droplet sizes, and velocities
6.2 Results and discussion
6.2.1 Comparison of a radius of throw and coefficient of discharge at different operatingpressures
6.2.2 Relationship between rotation speed for three different sprinkler heads
6.2.3 Comparison of water distribution profiles
6.2.4 Comparison of the computed uniformity coefficient
6.2.5 Spray distributions in the middle and end of the range
6.2.6 Droplet size distribution
6.2.7 Droplet characterization statistic
6.2.8 Droplet velocity distribution
6.3 Brief summary
CHAPTER 7: CONCLUSIONS AND RECOMMENDATIONS
7.1 Conclusions
7.2 Recommendations for further research
REFERENCES
ACKNOWLEDGMENTS
PUBLICATIONS
RESEARCH PROJECTS
APPENDIX
本文编号：3842582
【文章页数】：154 页
【学位级别】：博士
【文章目录】：
ABSTRACT
摘要
CHAPTER 1: INTRODUCTION
1.1 Research background
1.2 Objectives, scope and structure of research
1.3 Area equipped for irrigation
1.4 Sprinkler
1.5 Types of sprinklers irrigation
1.5.1 Impact sprinkler
1.5.2 Complete fluidic sprinkler
1.5.3 Hand-move sprinkler system
1.5.4 Solid set and permanent systems
1.6 Equipment and design
1.7 Wind drift and droplet evaporation
1.8 Sprinkler hydraulic performance parameters
1.8.1 Sprinkler discharge
1.8.2 Patterns radius (throwing distance)
1.8.3 Water application rate or intensity
1.8.4 Distribution pattern
1.8.5 Sprinkler droplet size
1.8.6 Sprinkler irrigation uniformity
1.8.7 Methods of measuring droplet size distributions
CHAPTER 2: OPTIMIZATION OF THE FLUIDIC COMPONENT OF COMPLETE FLUIDIC SPRINKLER AND TESTING OF THE NEW DESIGNED SPRINKLER
2.1 Design of newly dynamic fluidic sprinkler head and working principle
2.1.1 Design of the Nozzles
2.1.2 Experimental setup and procedure
2.2 Results and analysis of orthogonal tests
2.2.1 Comparison of operating pressure and discharge
2.2.2 Summary results of the orthogonal test
2.2.3 Simulation 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
3.1.2 Rotation speed
3.1.3 Grid sensitivity analysis
3.1.4 Boundary conditions
3.1.5 Experimental procedure
3.2 Results and discussion
3.2.1 Relationship between velocity distribution and nozzle sizes
3.2.2 Relationship between velocity and length of the tube
3.2.3 Comparison of the numerical simulation, calculated and experimental results
3.2.4 Comparison of rotation speed and the nozzle sizes
3.2.5 Relationship between rotation speed and length of the tube
3.2.6 Effect of internal velocity distribution on hydraulic performance
3.3 Brief summary
CHAPTER 4: EVALUATION OF HYDRAULIC PERFORMANCE CHARACTERISTICS OF THE DYNAMIC FLUIDIC SPRINKLER
4.1 Structure and working principle of 2d-video distrometer
4.2 Experimental procedures
4.3 Results and discussion
4.3.1 Comparison of water distribution profiles
4.3.2 Comparison of computed uniformity coefficient
4.3.3 Droplet size distributions
4.3.4 Droplet 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 THENEWLY DESIGNED DYNAMIC FLUIDIC SPRINKLER
5.1 Experimental procedures
5.1.1 Evaluation of sprinkler performance
5.1.2 Overlap water distribution
5.2 Results and discussion
5.2.1 Quadrant completion time
5.2.2 Deviation in water application intensity
5.2.3 Comparison 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
6.1 Structure and the working principle of three different sprinkler heads
6.1.1 Experimental setup and procedure
6.1.2 Calculation of combined CUs, droplet sizes, and velocities
6.2 Results and discussion
6.2.1 Comparison of a radius of throw and coefficient of discharge at different operatingpressures
6.2.2 Relationship between rotation speed for three different sprinkler heads
6.2.3 Comparison of water distribution profiles
6.2.4 Comparison of the computed uniformity coefficient
6.2.5 Spray distributions in the middle and end of the range
6.2.6 Droplet size distribution
6.2.7 Droplet characterization statistic
6.2.8 Droplet velocity distribution
6.3 Brief summary
CHAPTER 7: CONCLUSIONS AND RECOMMENDATIONS
7.1 Conclusions
7.2 Recommendations for further research
REFERENCES
ACKNOWLEDGMENTS
PUBLICATIONS
RESEARCH PROJECTS
APPENDIX
本文编号：3842582
本文链接：https://www.wllwen.com/shoufeilunwen/nykjbs/3842582.html