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| Effects of Air Injection on Smoke Emissions of a Sequential-Turbocharged Diesel Engine During Switching Process |
| DOI： |
| Key Words:IC engine diesel engine sequential air-charging air injection smoke emissions |
| Author Name | Affiliation | | SUN Yongrui,WANG Yinyan,WANG Hechun,HU Song,HE Qinglin | 1.College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001,China；
2.Shanghai Marine Diesel Engine Research Institute, CSIC, Shanghai 201108,China |
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| Abstract:In order to reduce the smoke of a sequential-turbocharged diesel engine during the switching process, a real-time controlling and measuring system of compressed air assist was established for a TBD234 diesel engine. An experimental study was performed to investigate the reduction of smoke emissions during the switching process by air injection. The results show that an optimal strategy is to start the air injection at the opening of exhaust valve with injection duration of 3 s. Earlier air injection or longer injection duration is ineffective to reduce engine smoke. Delaying injection or shortening injection duration weakens the benefit of the air injection. Compared with the performance of the base engine, the air injection with the optimal strategy improves the air to fuel ratio and combustion process during the switching process, with smoke reduced by 50.5%. |
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