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| Simulation Study on Two-Stage Turbocharger Matching for Heavy-Duty Diesel Engines |
| DOI：10.13949/j.cnki.nrjgc.2024.02.008 |
| Key Words:diesel engine two-stage turbocharging turbocharger matching genetic algorithm fuel consumption rate |
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| Abstract: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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