基于型线的螺旋离心泵叶轮做功能力研究

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Research on Work C apacity of Screw C entrifugal PumpImpeller Based on Profile LinesQUAN Hui LI Rennian SU Qingmiao HAN Wei LI Qifei SHEN Zhengjing(1.School of Energy and Power Engineering，Lanzhou University of Technology，Lanzhou 730050；2.School of Petrochemical Technology，Lanzhou University of Technology，Lanzhou 730050)Abstract：Based on the N-S equation and k-e standard turbulence model，the inner flow of a screw centrifugal pump is simulated tostudy the work capacity of the impeller.The velocity，pressure and concentration along the blade in the whole process are observed，the energy transfer of transmission medium produced by impeller is separated into the centrifugal force work，the airfoil lift work andthe volume change with the concept of lift coeficient of airfoil and drag coeficient，the blade load coeficient is used to analyzeworking capability of each segment of screw centrifugal pump impeler by introduction of load coeficient of centrifugal force，loadcoeficient of lifting and volum e load coeficient，and the efect of two phase flow meum on impeler working is also analyzed.Theresults show that fluid energy of screw centrifugal pum P is primarily provided by helical segment，the helical segm ent in the front ofthe impeler play an important role in multistage energized，the solid-liquid flow in screw centrifugal pump is turbulent flOW，and thesolid and liquid phase flows with diferent velocities respectively because of being pushed by the impeler screw and centrifugalefect.As liquid phase is the primary phase，the energy conversion is mainly up to the change of liquid energy ，the solid phase flowsunder the wrapped action of liquid，and solid energy is carried out through liquid indirectly.Large particle size of solid phase and thehilgher volume concentration of tw o phase flow are more advantageous to the liquid energy conversion in the two-phase flOW，on thecontrary，when the volume concentration is too high，it is not conducive to the liquid energy conversion。

Key words：Screw centrifugal pum p Profile Lines Load factor Num erical simulation Work capacity0 前言螺旋离心泵作为-种具有特殊结构的新型杂·国家自然科学基金(51079066)、甘肃省自然科学基金(0906ZTB093)和甘肃省财政厅专项基金(51O1zTc003)资助项目。20121114收到初稿，20130420收到修改稿质泵，它将螺旋泵与离心泵二者的优势融合为-体(螺旋离心泵实物如图 1所示)，其独特的结构可将两者的优势充分发挥。相比其他杂质泵，螺旋离心泵具有良好的无堵塞性、吸入性能、调节性能和抗汽蚀性能，并具有无过载、效率高及高效区宽等优 。