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RISS 인기검색어
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- 저자 : Can Gong (검색결과 3 건)
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Influence of stator vane number on performance of the axial-flow pump
Can Kang,Xiaojie Yu,Weifeng Gong,Changjiang Li,Qifeng Huang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
The interplay of impeller and stator is investigated for an axial-flow pump. Three stator vane numbers of 5, 7 and 9 are devised tomatch the same impeller. The renormalization group k-ε turbulence model is used to simulate three-dimensional flows in three pumpswith different vane numbers. Axial velocity distributions at impeller outlet and stator outlet are comparatively analyzed. Experimentsassess operation performance of the three pumps. Vibration parameters and static pressure fluctuations are measured as well. It is indicatedthat the influence of vane number on both pump head and pump efficiency is insignificant. Large stator vane number contributes tothe improvement of the uniformity of axial velocity distribution at impeller outlet. At stator outlet, similar tendency is revealed. Severevibration occurs near the outlet bend of the pump, as is particularly remarkable at vane number of 9. For the three cases, blade passingfrequency and its harmonics are predominant in the frequency spectra of pressure fluctuations. As flow rate increases from 0.8Q to 1.0Q,high-frequency pressure fluctuations are suppressed considerably at vane number of 9, while the other two cases also manifest a declinein overall pressure fluctuation amplitude. The 7-vane case is the most preferable one among the three cases in terms of both pump performanceand pressure fluctuation between the impeller and the stator.
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Deep Drawing of Cylindrical Cups Using Polymer Powder Medium Based Flexible Forming
Can-Bin Zhang,Feng Gong 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1
A novel flexible forming process—polymer powder medium based flexible forming (PPFF)—was presented in this research. Cylindrical cups with inner diameter of 8 mm were formed using rigid mould deep drawing and PPFF process, respectively. The blank material was pure copper C1100 with a thickness of 0.4 mm which was annealed at 450oC for 1 h in vacuum condition. The deep drawing experiments were carried out at room temperature under dry friction condition. Ethylene-vinyl acetate copolymer (EVA), poly vinyl chloride (PVC) and ultra-high molecular weight polyethylene (UHWPE) were used. The influence of polymer powder type and weight on deep drawing force and limiting drawing ratio (LDR) were investigated. The results showed that the cylindrical cups were well formed by using PVC. The LDR reached 2.1 by using PVC, higher than rigid mould. The surface quality was also good, with the thinning rate much smaller than rigid mould forming.
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Fa-yang Jin,Song Wang,Wan-Fen Pu,Cheng-dong Yuan,Lei Wang,Ke-xing Li,Can Gong 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
Emulsified oil foam was investigated to improve the flowability of heavy oil under high salinityenvironment of 23 104 mg/L. Sixteen foaming agents were used to determine an applicableformulation. The factors affecting the formation and stability of the emulsified oil foam were evaluated,including oil viscosity, oil–water ratio, foaming agent concentration, stirring rate and time, andtemperature. The microgram of emulsified oil foam was analyzed by polarizing microscope. The resultsshowed that stable pseudo-emulsion film was built. The considerable dynamic viscosity-reducing ratesin different depth in wellbore were obtained according to pressure differential method in long tubephysical simulation experiments.
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