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injection system design for a hadron therapy synchrotron

Chinese Physics C 2008年第5期32卷 393-396页

作者：张金泉宋明涛魏宝文 Institute of modern Physics Chinese Academy of SciencesLanzhou 730000China Graduate University of Chinese Academy of SciencesBeijing 100049China Institute of modern Physics Chinese Academy of SciencesLanzhou 730000China

A synchrotron is designed for tumour therapy with C^6＋ ions or proton. Its injector is a cyclotron, which delivers C^5＋ or H＋ ions to the synchrotron. After comparing the methods of the single-turn injection, the multi-turn injection and the stripping injection, this paper chooses the stripping injection method. In addition, the concept design of the injection system is presented, in which the synchrotron lattice is optimized.

关键词： injection mode stripping injection synchrotron lattice

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New method for plugging channeling in oil field by nitrogen foam

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Journal of Central South University 2014年第2期21卷 677-683页

作者：杨朝蓬高树生岳湘安吕毓刚睢宏刚魏浩光 Institute of Porous Flow & Fluid Mechanics Chinese Academy of Sciences PetroChina Research Institute of Petroleum Exploration & Development Research Institute of Petroleum Exploration and Development-Langfang Key Laboratory of Petroleum Engineering of Ministry of Education(China University of Petroleum) Oil Production Technology Research institute of Xinjiang Oilfield Company Hubei Branch of PetroChina Kunlun Gas Co. Ltd SINOPEC Research Institute of Petroleum Engineering

In order to present a new method for plugging channeling in oil field,the injection modes and validity period of foam system which plugged the formation water layer were studied by means of the experimental model which simulated the real conditions of oil wells existing *** all,the influence factors including reservoir pressure,permeability,oil saturation and gas-to-liquid ratio were studied through dynamic ***,in light of the technology characteristics of foam injection in oil field,the comparison between gas-liquid and liquid-gas injection modes was *** result shows that the gas-liquid injection mode can ensure the foam injectivity and plugging *** plugging validity of nitrogen foam injected into the formation water layer was evaluated in different plugging pressure gradients by the dynamic method which is more reasonable than the static evaluation method in *** research demonstrates that the plugging validity period of foam decreases with plugging pressure gradient *** the plugging pressure gradient is 0.15 MPa/m,the validity period is 160 ***,a empirical equation and a plate about the plugging validity and the plugging pressure gradient were obtained for forecasting the validity period of foam.

关键词： foam system plugging performance channeling injection mode plugging validity

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Study of the Effect of Combustion Chamber Shape on the Mixture Formation and Combustion Characteristic on CNG-di Engine

Study of the Effect of Combustion Chamber Shape on the Mixtu...

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2016中国汽车工程学会年会暨展览会

作者： Jiang Tao Lin Xuedong Yang Miao State Key Laboratory of Automotive Simulation and Control Jilin University

A combustion system model of CNG- DI engine which was modified from a 2.0L diesel engine was built with software FIRE,the turbulence combustion model of CNG- DI engine was verified with the experimental result of CNG- DI optical engine,on the condition of unchanged 4 valves structure of original engine and the jet location,the spark plug was arranged between the two exhaust valves,the effect of different combustion chamber shapes on the microscopic physical fields such as turbulence characteristic in cylinder was simulated and studied,based on which the effect of combustion chamber shapes on the formation and combustion of mixture and the formation rule of NO was *** result shows that he combustion shape has a tremendous influence on the turbulence characteristic of cylinder and distribution characteristics of concentration fields especially besides the spark plug,which plays a decisive role on the whole process of combustion;Not only the production of NO can be inhibited and the combustion propagation speed which is in favour of lean burn can be controlled effectively when the straight mouth combustion chamber was used at the bottom of which has a proper *** amount of NO is closely related to the size of the reaction area and the duration of reaction besides the reaction rate of NO when the CNG fuel is injected into cylinder directly and burned thin,which can be controlled by the rational design of the structure of combustion chamber.

关键词： CNG-DI engine lean burn injection mode mixture formation mechanism flame propagation characteristic NOx formation rule

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