圆盘通孔叶轮的能量转换特性

Characteristics of energy transformation in disc impellers with holes

为研究圆盘通孔叶轮的流动及能量转换特性,以能量转换及定量的数学分析为依据,通过对圆盘通孔叶轮内介质的运动规律及受力分析,证明了此类叶轮对水流做功不同于叶片泵的做功机理,即叶轮以产生哥氏加速度的作用力对水做功,且叶轮做功量与水流机械能增量存在等值关系.同时,以理论方式揭示了该类泵的一些不同于离心泵的外特性:叶轮产生的理论扬程不随流量变化而变化;在相同的转速与叶轮直径条件下,圆盘通孔泵将产生更高的扬程.有关圆盘通孔泵的理论结果有助于深化叶轮流动的研究方法,为分析圆盘通孔叶轮内的流动及叶轮做功特性提供一定的理论依据.

In order to study the flow and energy conversion characteristics of disc impeller with holes,based on energy conservation theorem and quantitative mathematical calculation analysis,the mechanism of doing work which differs from that of centrifugal pumps was analyzed,that is,the disc impeller performs work by making use of the thrust which caused Coriolis acceleration and the increment of mechanical energy of fluid was equivalent to the work performed by disc impeller.It is proved that the working mechanism of this kind of impeller for water flow is different from that of vane pump,that is,the impeller works on the water with the force generating Coriolis acceleration,and there is an equivalent relationship between the amount of work done by the impeller and the increment of water flow mechanical energy.At the same time,some hydraulic characteristics of this kind of pump which are different from centrifugal pump are revealed theoretically:the theoretical head produced by the impeller does not change with the flow.Disc pump generate higher heads than centrifugal pumps with the same impeller diameters and rotation speed.The results will help develop research approach for disc pumps and be beneficial in flow and energy conversion study in disc pumps.