The law governing the movement of particles in the centrifugal pump channel is complicated; thus, it is difficult to examine the solid-liquid two-phase turbulent flow in the pump. Consequently, the solid-liquid two-ph...The law governing the movement of particles in the centrifugal pump channel is complicated; thus, it is difficult to examine the solid-liquid two-phase turbulent flow in the pump. Consequently, the solid-liquid two-phase pump is designed based only on the unary theory. However, the obvious variety of centrifugal-pump internal flow appears because of the existence of solid phase, thus changing pump performance. Therefore, it is necessary to establish the flow characteristics of the solid-liquid two-phase pump. In the current paper, two-phase numerical simulation and centrifugal pump performance tests are carried out using different solid-particle diameters and two-phase mixture concentration conditions. Inner flow features are revealed by comparing the simulated and experimental results. The comparing results indicate that the influence of the solid-phase characteristics on centrifugal-pump performance is small when the flow rate is low, specifically when it is less than 2 m3/h. The maximum efficiency declines, and the best efficiency point tends toward the low flow-rate direction along with increasing solid-particle diameter and volume fraction, leading to reduced pump steady efficient range. The variation tendency of the pump head is basically consistent with that of the efficiency. The efficiency and head values of the two-phase mixture transportation are even larger than those of pure-water transportation under smaller particle diameter and volume fraction conditions at the low-flow-rate region. The change of the particle volume fraction has a greater effect on the pump performance than the change in the particle diameter. The experimental values are totally smaller than the simulated values. This research provides the theoretical foundation for the optimal design of centrifugal pump.展开更多
为提高航天用液氨类齿轮泵的使役性能及在机械泵驱动两相回路(MPTL)中的匹配性能,研究了基于该两相回路的用泵特点并精确计算了泵的容积效率,由泵输出流量、容积效率的输出特性得出泵转速的使役特性并进行实例运算及灵敏度分析。结果表...为提高航天用液氨类齿轮泵的使役性能及在机械泵驱动两相回路(MPTL)中的匹配性能,研究了基于该两相回路的用泵特点并精确计算了泵的容积效率,由泵输出流量、容积效率的输出特性得出泵转速的使役特性并进行实例运算及灵敏度分析。结果表明:液氨类介质泵的容积效率一般比较低;泵的输出流量具有与转速的正线性、压差的负线性、介质黏度的负反相关的比例特性;泵的容积效率具有与压差/转速的负线性相关特性,适宜于高速、轻载工况;泵的使役转速具有与MPTL回路流量的正线性、回路压差的负线性、回路介质黏度的负反相关的比例特性,宜用于压差/转速(流量)恒定的回路工况;案例的介质黏度小于0.00419 Pa s的区域为压差敏感的低黏度区,否则为流量敏感黏度区。所得结论为液氨类航天用泵的进一步研究与开发,提供了理论依据。展开更多
基金supported by National Natural Science Foundation of China(Grant No. 51076144)Zhejiang Provincial Key Science Foundation of China(Grant No. 2009C13006)
文摘The law governing the movement of particles in the centrifugal pump channel is complicated; thus, it is difficult to examine the solid-liquid two-phase turbulent flow in the pump. Consequently, the solid-liquid two-phase pump is designed based only on the unary theory. However, the obvious variety of centrifugal-pump internal flow appears because of the existence of solid phase, thus changing pump performance. Therefore, it is necessary to establish the flow characteristics of the solid-liquid two-phase pump. In the current paper, two-phase numerical simulation and centrifugal pump performance tests are carried out using different solid-particle diameters and two-phase mixture concentration conditions. Inner flow features are revealed by comparing the simulated and experimental results. The comparing results indicate that the influence of the solid-phase characteristics on centrifugal-pump performance is small when the flow rate is low, specifically when it is less than 2 m3/h. The maximum efficiency declines, and the best efficiency point tends toward the low flow-rate direction along with increasing solid-particle diameter and volume fraction, leading to reduced pump steady efficient range. The variation tendency of the pump head is basically consistent with that of the efficiency. The efficiency and head values of the two-phase mixture transportation are even larger than those of pure-water transportation under smaller particle diameter and volume fraction conditions at the low-flow-rate region. The change of the particle volume fraction has a greater effect on the pump performance than the change in the particle diameter. The experimental values are totally smaller than the simulated values. This research provides the theoretical foundation for the optimal design of centrifugal pump.
文摘为提高航天用液氨类齿轮泵的使役性能及在机械泵驱动两相回路(MPTL)中的匹配性能,研究了基于该两相回路的用泵特点并精确计算了泵的容积效率,由泵输出流量、容积效率的输出特性得出泵转速的使役特性并进行实例运算及灵敏度分析。结果表明:液氨类介质泵的容积效率一般比较低;泵的输出流量具有与转速的正线性、压差的负线性、介质黏度的负反相关的比例特性;泵的容积效率具有与压差/转速的负线性相关特性,适宜于高速、轻载工况;泵的使役转速具有与MPTL回路流量的正线性、回路压差的负线性、回路介质黏度的负反相关的比例特性,宜用于压差/转速(流量)恒定的回路工况;案例的介质黏度小于0.00419 Pa s的区域为压差敏感的低黏度区,否则为流量敏感黏度区。所得结论为液氨类航天用泵的进一步研究与开发,提供了理论依据。
