刘岱，David O. OGALO,刘龙.低速二冲程船用柴油机耦合涡流影响的现象学喷雾模型研究[J].内燃机工程,2021,42(2):1-8.
低速二冲程船用柴油机耦合涡流影响的现象学喷雾模型研究
Study on Phenomenological Spray Model of the Effect of Coupling Swirl Flow in Low-Speed Two-Stroke Marine Diesel Engines
DOI：10.13949/j.cnki.nrjgc.2021.02.001
关键词:喷雾贯穿距  涡流  喷雾偏转  喷雾形态  低速二冲程柴油机
Key Words:pray penetration distance  swirl flow  spray deflection  spray morphology  low-speed two-stroke diesel engine
基金项目:船用低速机工程（一期）研制（工信部联装函[2017]21号）
作者单位
刘岱，David O. OGALO,刘龙 哈尔滨工程大学 动力与能源工程学院，哈尔滨 150001 
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摘要:为了更深入地研究低速机缸内涡流对喷雾的影响，开发新的现象学模型并进行了优化计算。该模型在传统的广安博之多区现象学模型之上加入了涡流效应。在模型中，涡流与喷雾的相互作用被分成两个阶段：一是喷雾破碎前空气与喷雾的互相撞击，二是喷雾破碎后的空气的混合与卷吸。根据这两个阶段不同的物理作用，结合动量守恒定理的推导，可以计算出这两个阶段中喷雾被涡流偏转的速度，从而与喷雾的原速度合成得到喷雾与涡流互相作用的合速度。在这个过程中，开发了液滴蒸发、空气卷吸等子模型使计算更接近实际情况。经过与文献中的试验数据进行对比，发现所开发的模型在不同工况(3MPa~9MPa, 400 K~900 K)下对喷雾贯穿距与形态等参数都具有良好的预测效果。通过模型进一步探索了喷射角度对喷雾贯穿距与形态的影响，为后续低速机喷雾优化提供了理论依据。
Abstract:In order to further investigate the effect between swirl and spray in the cylinder of low-speed two-stroke marine diesel engines, a novel phenomenological model was developed and then used to optimize the spray direction. This model considered the swirl effects based on the traditional Hiroyasu’s multi-zone phenomenological model. In the model, the interaction between the swirl and the spray was divided into two stages, i.e. the collision of the air and the spray before the breakup, and the mixing and entrainment of the air after the breakup. According to the different physical effects of the two stages, the velocities at which the spray were deflected by the swirl in the two stages could be calculated with the conservation of momentum. The resultant velocity of the interaction between the spray and the swirl could be obtained by combining the calculated velocities and the original velocity of the spray. In this process, sub-models such as droplet evaporation and air entrainment were developed to make the simulation closer to the actual situation. The developed models were validated for predicting spray penetration and morphology parameters under different operating conditions (3 MPa~9 MPa, 400 K~900 K)compared with test data in literatares. And through the model, the influence of spray angle on spray penetration and morphology was further investigated, which could provide a theoretical basis for the subsequent optimization of low-speed engine.
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