Advanced CFD simulation of a compressed air injection module

Németh, Huba [Németh, Huba (gépjármű), author] Department of Automobiles and Vehicle Manufactu... (BUTE / FTE); Kristóf, Gergely [Kristóf, Gergely (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME); Szente, Viktor [Szente, Viktor (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME); Palkovics, László [Palkovics, László (Gépészet (járművek)), author]

English Scientific Conference paper (Chapter in Book)
    Turbocharged engines exhibit the so called turbo lag phenomenon causing a disadvantageous response comparing to atmospheric or mechanically supercharged engines. There are many solutions developed to reduce the lag effect although each of them has some disadvantages. This paper investigates a booster module that injects compressed air to increase the response of turbocharged compression ignition engines of commercial vehicles. The investigations applied 3D computational fluid dynamic (CFD) simulations in stationary and transient manner as well. The transient simulations were applied as standalone and coupled calculations to a 1D engine simulation code to capture more accurate boundary conditions (BC). The drawbacks and problems of this new and advanced approach are emphasized in the paper. Due to the deformation of the flow field boundary surface during the dynamic process a deforming mesh method has been applied here. Instant shape of flow field boundary has been obtained by solving the equation of motion of the actuator rotor. By applying the above methods it was possible to validate the booster module design variants and to identify the main characteristics of the complete system including the engine.
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    2021-12-04 20:08