孙永瑞，王银燕，王贺春，胡松，何清林.喷气对相继增压柴油机切换过程碳烟排放的影响[J].内燃机工程,2017,38(1):12-17.
喷气对相继增压柴油机切换过程碳烟排放的影响
Effects of Air Injection on Smoke Emissions of a Sequential-Turbocharged Diesel Engine During Switching Process
DOI：
关键词:内燃机  柴油机  相继增压  喷气  碳烟排放
Key Words:IC engine  diesel engine  sequential air-charging  air injection  smoke emissions
基金项目:国家“八六三”高技术研究发展计划项目（2012BAF01B00）
作者单位
孙永瑞，王银燕，王贺春，胡松，何清林 1.哈尔滨工程大学 动力与能源工程学院，哈尔滨 150001
2.中国船舶重工集团公司 第711研究所，上海 201108 
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摘要:为解决相继增压柴油机在切换过程中碳烟排放急剧增加的问题，在TBD234型柴油机上建立了基于数据实时采集的压缩空气辅助试验系统，对采用喷气方法降低切换过程中碳烟排放进行了试验研究。研究结果表明：在燃气阀打开时开始喷气，喷气持续期为3 s是最佳喷气策略；喷气始点提前或延长喷气持续期不能明显改善碳烟排放；喷气始点延后或者缩短喷气持续期会减弱喷气效果；与原机相比，采用最佳喷气策略可以提高切换过程中的空燃比，改善缸内燃烧过程，使烟度值降低50.5%。
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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