Compact Long-Route Exhaust Gas Recirculation Mixer Design and Optimization

摘要

Reducing engine emissions becomes a very challenging target in automotive industries. Long-route exhaust gas recirculation (EGR) is considered as one potential solution to reduce emissions. The hot-gas is injected back into the turbocharger compressor wheel inlet. The hot gas will cause strong distortion in temperature and pressure fields. From the aerodynamics point of view, that will result in compressor performance loss and potential wheel overheating.rnIn this paper, the design and CFD-optimization of long-route EGR mixers are discussed. Several design configurations were investigated. One selected design was optimized by changing different design parameters to achieve minimum loss and maximum uniformity of compressor inlet temperature.