Mathematical Modelling of Partially Filled Fluid Coupling Behaviour

Authors: A. M. Maqableh

Abstract:

Modelling techniques for a fluid coupling taken from published literature have been extended to include the effects of the filling and emptying of the coupling with oil and the variation in losses when the coupling is partially full. In the model, the fluid flow inside the coupling is considered to have two principal velocity components; one circumferentially about the coupling axis (centrifugal head) and the other representing the secondary vortex within the coupling itself (vortex head). The calculation of liquid mass flow rate circulating between the two halves of the coupling is based on: the assumption of a linear velocity variation in the circulating vortex flow; the head differential in the fluid due to the speed difference between the two shafts; and the losses in the circulating vortex flow as a result of the impingement of the flow with the blades in the coupling and friction within the passages between the blades.

Keywords: Fluid Coupling, Mathematical Modelling, partially filled.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1328824

References:

[1] Rolfe, G. H., "Research on hydraulic coupling," Proc. Instn. Mech. Engrs., vol. 183, no. 12, 1968, pp. 219-232.
[2] Qualman, J. W., and Egbert, E. L., "Fluid coupling passenger car automatic transmission," Advanced Engineering, vol. 5, 1973, PP. 173- 150.
[3] Wallace, F. J., Whitfield, A., and Sivalingam, R., "A theoretical model for the performance prediction of fully filled couplings," International Journal of Mechanical Science, vol. 20, 1978,pp. 336-347.
[4] Whitfield, A., Sivalingam R., and Wallace, F. J., 1978, "The performance prediction of fluid coupling with the introduction of a baffle plate," International Journal of Mechanical Science, vol. 20, pp. 729-736.
[5] Whitfield, A., Wallace, F. J., and Patel, A., "Performance prediction of multi element torque converters," International Journal of Mechanical Science, 1983, vol. 25, pp. 77-85.