Application of slotted blade in the improvement of turbomachinery performance

Abstract

Flow separation is ubiquitous in turbomachinery. Compared with the more mature turbomachinery flow separation control method where the medium is gas, the turbomachinery flow separation method where the medium is liquid cannot be controlled well. In this study, according to the flow separation control principle of the aircraft fowler flap, taking the stator blade of the hydraulic torque converter as the basic research object, the stator blade shape is fitted with Joukowsky transformation, and then it is slotted. Computational fluid dynamics is used to perform flow analysis on original blades and slotted blades. It is found that compared with that of the original blade, the slotted blade’s flow separation phenomenon is effectively suppressed, turbulent kinetic energy is reduced, flow is more stable, and energy loss is reduced. In addition, using slotted blades for torque converter simulation, the torque ratio is increased by up to 0.245, and the efficiency is increased by up to 5%, which shows that slotted blades can improve the mechanical performance of the pump wheel and are not limited to the torque converter.

Automatic Transmissions: On the Relationship Between the Cavitation Modes of the Torque Converter and High-Frequency Resonant Torsional Oscillations of Mechanical Components

“…К настоящему времени в ряде публикаций [26][27][28] показано, что объем паровой фракции, образующейся в процессе кавитации, может достигать нескольких десятков процентов общего объема рабочей жидкости, находящейся в ГТ. Сам процесс коллапса пузырьков пара сопровождается массовыми гидравлическими ударами, которые, кроме разрушений, также генерируют шум, высокочастотные локальные забросы давления, приводящие к крутильным колебаниям, и, что не менее важно, деградации характеристик ГТ: выходной скорости, крутящего момента, КПД.…”

“…О методах воздействия на кавитацию в ГТ АГМТ. Практически все работы, рассмотренные выше [18][19][20][21][22][23][24][25][26][27], а также [28][29][30] направлены на снижение кавитации. Факторы, влияющие на ее возникновение и развитие в ГТ, подразделяются на конструктивные и эксплуатационные.…”

Research on the Influence of Charging Oil Conditions on the Axial Force of Hydraulic Torque Converter

“…Li et al [17] proposed a performance optimization method for hydraulic torque converters based on blade angle design and established its integrated dynamics mapping relationship. Xiong et al [18,19] conducted research on cavitation caused by blades, using optimized Joukowsky airfoil profiles to reduce the degree of cavitation in the torque converter. They used slotted stator blades to suppress cavitation.…”

Effects of Slotted Impeller Configurations on the Hydraulic Performance of Double-Suction Pump

“…Pei et al [2] attempted optimal design based on four parameters to expand the operating area of the pump. Pan et al [3] discussed the effects of the slotted impeller and flat type impeller configuration on flow characteristics through experiments. Herman and Claude [4] evaluated that the slot of the impeller blade did not negatively affect cavitation, and it affected the Reynolds number to increase pressure and [5] analyzed the effect of the splitter blade on the cavitation of the double-suction centrifugal pump.…”