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.
Highlights
Optimization of turbomachinery design requires minimizing manufacturing and operating costs while maintaining high system efficiency
Flow separation refers to the flow of fluid leaving the surface of the blade, which is generally caused by backpressure gradients and geometric mutations
It is often accompanied by thickening of the boundary layer and the appearance of a recirculation zone, which will lead to an increase in resistance, a decrease in lift, and an increase in pressure loss
Summary
Optimization of turbomachinery design requires minimizing manufacturing and operating costs while maintaining high system efficiency. Syawitri used Gurney flaps to improve the performance of wind power generators These control methods can be used well in low-pressure turbomachinery equipment that uses gas as a medium. The airflow under the wing flows through the gap to the upper surface, increasing the speed of the upper wing surface airflow, delaying the separation of the airflow layer, increasing the lift coefficient, and reducing the stall speed This method has been commonly used in many types of aircraft. According to the design principle of the aircraft fowler flap, the turbine cascade is improved, taking the stator blade of the torque converter as the basic research object. The blade is based on the traditional torque converter YJH-265 without changing the outlet angle, inlet angle, and thickness Since it is difficult to directly monitor the flow state in the stator of the torque converter in the experiment, the stator blade shape is extracted for experimental analysis in the form of a cascade, and PIV is used to monitor the flow field
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