Numerical Analysis of the flow field in the torque converter

Abstract

Computational fluid dynamics (CFD) based on the finite volume method (FVM) is used to simulate the three-dimensional viscous flow in a torque converter. The simulation result is in good coincidence with the test value and is analyzed theoretically. First, rotor enthalpy is applied to evaluate the hydraulic performance of the torque converter. It is effective to locate and classify hydraulic losses according to the drop in rotor enthalpy. Then, the mechanisms of the jet-wake and secondary flow are analyzed. There is strong coupling between the jet-wake and the secondary flow. The jet-wake flow begins with low-speed flow at the suction-core corner, which is transported to the suction side of the pump blade by the secondary flow. Finally, a prediction model of mainstream vorticity charging with pitch-wise and span-wise components is deduced from the momentum equation. The prediction model reveals that there is a positive mainstream vorticity in the first half of the pump flow channel and a negative value in the second half, which is consistent with the CFD result.

CFD‐based pesticide selection for a nozzle used in a six‐rotor UAV in hover mode for tea spraying

“…These discrepancies from using the PIV system may be caused by particle image overlap, particle coalescence, and nonuniform illumination of the sample volume. 31 It follows that, from the above quantitative comparisons, the CFD models of the nozzles are, in general, comparable to the measurements in our experiment at the same settings. As can be inferred from the above, for nozzle FVP110-02 in the six-rotor UAV, bifenthrin is more appropriate than tea saponin water at the same concentration, whilst both bifenthrin and tea saponin water at a concentration of 1:1000 show the best performance under identical working conditions.…”