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Xiantao Zha,Guozhong Zhang,Yuhang Han,Jianwei Fu,Yong Zhou 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.3
To improve the airflow distribution consistency of each branch in the pneumatic fertilizer transportation system, so as to reduce the influence of airflow instability on the uniformity and stability of fertilizer transportation, as well as the energy waste in the process of pneumatic fertilizer transportation, a centralized pneumatic fertilizer transportation system for deep fertilization device was designed. Through theoretical calculation, the needed air flow rate, airflow speed and fertilizer pipe diameter of the system were obtained, and the fan was selected. Based on the Fluent simulation and bench tests, the influence of three air distribution method of placing fan at the end of main duct, placing fan in the middle of main duct and centralized air distribution on the airflow velocity and consistency of each branch was analyzed. The results showed that the airflow consistency of each branch in the centralized air distribution method was the best. Taking the air velocity at the outlet of each branch and its variation coefficient as the evaluation index, single factor and orthogonal simulation tests was carried out to optimize the structural parameters of centralized air distribution device. The simulation results showed that the primary and secondary factors affecting the air distribution consistency were: A (sidewall inclination angle), B (branch diameter), C (branch distance), A×B (interaction between A and B), B×C (interaction between B and C), A×C (interaction between A and C), and all the factors and their interactions had significant effects. The best parameter combination was sidewall inclination angle 15°, branch diameter 32 ㎜, branch distance 43 ㎜. With the combination, the variation coefficient of airflow velocity was 0.27% in simulation test and 1.23% in bench test. This research optimized the structure and parameters of pneumatic fertilizer transporting system, and provided references for the design and optimization of pneumatic fertilization and seeding device.
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Sitong Ling,Wenqiang Li,Tianda Yu,Qiang Deng,Guozhong Fu 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
The Control Rod Drive Mechanism (CRDM) is an essential part of the reactor, which realizes the start-stopand power adjustment of the reactor by lifting and lowering the control rod assembly. As a moving partin CRDM, the latch directly contacts with the control rod assembly, and the life of latch is closely relatedto the service life of the reactor. In this paper, the relationship between the life of the latch and the stepstress, friction stress, and impact stress in the process of movement is analyzed, and the optimizationmethodology and process of latch life based on the approximate model are proposed. The design variables that affect the life of the latch are studied through the experimental design, and the optimizationobjective of design variables based on the latch life is established. Based on this, an approximate model ofthe life of the latch is built, and the multi-objective optimization of the life of the latch is optimizedthrough the NSGA-II algorithm.
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