Simulation Study on Two-Stage Turbocharger Matching for Heavy-Duty Diesel Engines
In order to reduce the fuel consumption rate of a heavy-duty diesel engine,the matching of a two-stage turbocharger using GT-POWER software was carried out on a single stage variable geometry turbocharger(VGT)diesel engine.Simulation results show the proposed two-stage turbocharging system can operate at peak efficiency at the matching point and provide sufficient intake airflow across all operating conditions.Fully closing the wastegate valve in the low-pressure stage and synergistically optimizing the wastegate valve opening in the high-pressure stage along with Miller cycle valve closing angle can further reduce the fuel consumption rate of the two-stage turbocharged engine.Furthermore,reducing the intercooler temperature between stages can reduce pumping losses and enhance boost pressures.Specifically,a temperature reduction from 100℃to 50℃at the rated point can result in an approximate improvement of 3 g/(kW·h)in fuel consumption rate.Experimental validation of the improvement in fuel efficiency from the two-stage turbocharging system was conducted,revealing reduction in fuel consumption rates during low-speed operating conditions and reduction of 4.1%in fuel consumption rate at the high-efficiency operating point.
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