Some Unresolved Problems in the Design of Turbochargers

Despite the significant advances that have been made in understanding the aerothermodynamics of the radial flow turbocharger components, particularly during the last two decades, such problems as the turbocharger effectiveness at low engine speeds, inadequate flow range, turbocharger lag, etc., continue to arouse concern. The paper examines the pros and cons of the various candidate schemes to solve these problems.