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Sökning: WFRF:(Chen Tingkuan)

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1.
  • Li, Huixiong, et al. (författare)
  • 蒸汽-冷流体接触冷凝流动的数值模拟
  • 2005
  • Ingår i: Journal of Engineering Thermophysics. - Beijing, China. - 0253-231X. ; 26, s. 963-966
  • Tidskriftsartikel (refereegranskat)abstract
    • 介绍了关于蒸汽-冷流体直接接触冷凝流动与传热的数值计算模型与部分研究结果。用Level Set方法确定蒸汽-冷流体接触界面的位置和形状,建立了对蒸汽和冷流体普遍适用的动量、能量和质量守恒方程,在能量和质量寺恒方程中增加了部分项用于计算蒸汽冷凝所产生的影响。用有限差分法在交错网格上离散控制方程,用Runge-Kutta法-五阶WENO组合格式求解Level Set输运方程,用压力修正的迭代Projection方法求解动量方程,而用SIMPLE方法求解温度控制方程。对算例的计算结果表明,本文所建立的数值计算模型能反映物理现象的宏观特性。根据计算结果,分析了本文模型的优缺点,并指出了今后改进的方向。
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3.
  • Li, Liangxing, et al. (författare)
  • Dynamic characteristics of molten droplets and hot particles falling in liquid pool
  • 2010
  • Ingår i: Frontiers of Energy and Power Engineering in China. - 1673-7393. ; 4:2, s. 246-251
  • Tidskriftsartikel (refereegranskat)abstract
    • The dynamic characteristics of molten droplets and hot particles at the very beginning of their fall into coolant pools are presented. The falling course of a single droplet or a single hot particle was recorded by a high-speed camera and a curve of velocity vs. time was obtained. Emphasis was placed on the effects of the droplet's size and temperature, the coolant's temperature and properties, and the droplet's physical properties on the moving behavior. The results for the all cases showed that the velocity of a falling droplet/particle decreased rapidly but rebounded shortly, at the beginning of droplet/particle falling in the coolant. Following such a V-shaped evolution in velocity, the droplet/particle slows down gradually to a comparatively steady velocity. An increase in either coolant temperature or droplet temperature results in a larger velocity variation in the "J-region", but a smaller deceleration when it moves out of the "J-region". The elevated volatility of a coolant leads to a steeper deceleration in the "J-region" and beyond. The bigger size of a particle leads to a greater velocity variation in the "J-region" and terminal velocity. A high melting point and thermal conductivity as well as lower heat capacity contribute to dramatic variation in the "J-region" and low terminal velocity.
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4.
  • Li, Liangxing, et al. (författare)
  • Experimental investigation on the moving characteristics of molten metal droplets impacting coolant
  • 2008
  • Ingår i: Experimental Thermal and Fluid Science. - 0894-1777. ; 32, s. 962-972
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper reports the results of an experimental investigation on the moving characteristics of molten metal droplets impacting coolant free surface. A visualization experimental facility of molten fuel coolant interactions (MFCI) is designed and set up in the present study. The lead–bismuth (Pb–Bi) alloys are employed as the metal materials. An automatic control circuit is designed and applied to control the release of the molten droplets. High-speed camera is employed to record the movement of the molten metal droplets falling down and into a coolant pool. Based on the analysis of the experimental data, a so-called “J-region” of the droplet’s velocity–time curves was found and the melt droplet enters the “J-region” when it impacts the free water surface. In the “J-region”, the velocity of the melt droplet decreases rapidly and suddenly at first, and then increases again. The droplet gradually reaches a comparatively steady velocity when it leaves the “J-region”. The present study provides essential information for further study on the fragmentation behavior of high-temperature molten droplets in coolant.
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6.
  • Li, Liangxing, et al. (författare)
  • 冷中子源冷包截面含汽率数理模型探讨
  • 2007
  • Ingår i: Journal of Engineering Thermophysics. - Beijing, China. - 0253-231X. ; 28, s. 64-67
  • Tidskriftsartikel (refereegranskat)abstract
    • 文章推导出一种计算冷包截面含汽率的数学模型;将模型计算结果与已知文献相关实验结果进行对比,验证了模型的正确性.利用该模型探讨了冷包截面含汽率的影响因素如气泡直径,工质液体的密度、粘性,加热功率等.模型计算表明:气泡直径越大,在同一截面高度处的截面含汽率越低;工质粘性越大,在同一截面高度处的截面含汽率越高.本文模型的计算结果能对冷包设计提供理论支持.
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7.
  • Li, Liangxing, et al. (författare)
  • 熔融液滴与冷却剂相互作用实验中液滴释放控制机构的研制
  • 2008
  • Ingår i: Nuclear Power Engineering. - ChengDu, China. - 0258-0926. ; 29, s. 42-45
  • Tidskriftsartikel (refereegranskat)abstract
    • 在高温熔融液滴与冷却剂相互作用的实验中,熔融液滴的释放控制对整个实验起至关重要的作用。本文在以往实验机械控制装置的基础上,自主设计一个自动控制电路来代替人工机械操作,利用控制电路给电磁铁提供瞬时脉冲来控制液滴瞬时释放下落,简化实验的可持续性操作,提高实验的重复性、精确性和操作方便性。
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8.
  • Li, Liangxing, et al. (författare)
  • 熔融液滴在冷却剂中的运动特性实验
  • 2007
  • Ingår i: Nuclear Power Engineering. - Chengdu, China. - 0258-0926. ; 28, s. 36-41
  • Tidskriftsartikel (refereegranskat)abstract
    • 设计、建立了研究高温熔融液滴与冷却剂相互作用的可视化实验装置,通过高速摄影记录熔融液滴的下落过程,获得了下落小球运动过程曲线,重点考察了液滴温度和冷却剂温度对液滴-冷却剂界面作用过程的影响。结果表明,熔融液滴穿过气-水界面后,将首先经历一个速度骤降-回升过程,之后液滴作减速运动下落;当冷却水温度一定时,高温熔融液滴温度越高,熔融液滴入水后下落速度越快;当熔融液滴温度一定时,冷却水温度越高,熔融液滴入水后下落速度越快。
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9.
  • Wang, Weishu, et al. (författare)
  • 二次启动前火箭发动机泵构件温度特性数值计算
  • 2005
  • Ingår i: Journal of Propulsion Technology. - Beijing, China. - 1001-4055. ; 26, s. 292-295
  • Tidskriftsartikel (refereegranskat)abstract
    • 用数值计算的方法研究了液体火箭发动机在二次启动前,发动机泵系统各构件的温度特性和泵腔含汽率。建立了基于集总参数法的发动机启动前排放过程中涡轮、泵及进口管的温度变化计算模型。排放冷却过程中冷却剂N2O4的单相强制对流换热系数用Dittus-Boelter公式计算,流动沸腾换热系数采用ShanMM强化模型。并对某液体火箭发动机二次启动前排放过程涡轮泵系统各构件温度变化和泵腔含汽率进行了计算,模型计算结果与试车数据吻合良好,研究结果表明,二次启动前的主动排放过程对泵壳体及进口管的冷却效果很好。
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10.
  • Wang, Weishu, et al. (författare)
  • 滑行过程中火箭发动机泵系统各构件温度数值模拟
  • 2005
  • Ingår i: Journal of Propulsion Technology. - Beijing, China. - 1001-4055. ; 26, s. 394-397
  • Tidskriftsartikel (refereegranskat)abstract
    • 利用数值计算的方法,研究了某型液体火箭发动机泵系统各构件及泵腔残余氧化剂在二次启动前滑行过程的温度变化。基于集总参数法建立了温度变化计算模型,并建立了泵腔残余氧化剂排空计算模型。计算结果与试车数据吻合良好。滑行过程中,涡轮温度下降,而泵壳体及进口管的温度升高;泵腔中残余氧化剂间歇排放。研究结果表明,滑行结束时泵系统的温度高于100℃,泵腔中残余氧化剂含汽率为1,不满足二次点火启动条件。
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