Search Results

This paper discusses about the effective utilization of fluid structure interactions simulation for the pump stage development of Impeller type fuel pumps. Axial clearance between the rotating impeller and stationary components is crucial for the effective performance of the pump stage. Because of designed interference fit and operating conditions the stationary pump stage components tend to deform towards rotating impeller. Computational simulations are extensively used in the design stage to predict this deformation behaviour. As these components bear wide variety of loads like structural, thermal & hydraulic loads, it demands coupled simulation to be performed. Computational fluid dynamics simulation was performed initially to get the pressure load distribution and solved in a structural solver along with other structural and thermal loads to calculate deformation. With the Multi-physics simulation results, pump stage design was optimized for minimum deformation.

Hydrodynamic launch elements, from the Foettinger principle of the torque converter to the first series production HCC wet clutch, are becoming more relied on in the transmission world for their high power density, launch comfort, and vibrational isolation capability. In order to attain the ambitious fuel economy objectives of the future, engine vibrations have to be successfully isolated from the driveline at low engine speed ranges without the use of the hydrodynamic circuit. This is now all the more challenging as new combustion engines are producing higher torsional vibrations as a result of fewer cylinders, higher combustion pressures, cylinder deactivation, and lower critical speeds. This paper will describe the next generation of powertrain vibrational isolation, dampening via powersplit. Additionally, a next generation wet launch element, the Hydrodynamically Cooled Clutch will be discussed.