Effect of compression ring elastodynamics behaviour upon blowby and power loss
Effect of compression ring elastodynamics behaviour upon blowby and power loss
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DOI：
10.4271/2014-01-1669
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发表时间：
2014-04
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影响因子：
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通讯作者：
C. Baker;R. Rahmani;Ioannis Karagiannis;S. Theodossiades;H. Rahnejat;Alan Frendt
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文献类型：
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作者：
C. Baker;R. Rahmani;Ioannis Karagiannis;S. Theodossiades;H. Rahnejat;Alan Frendt
汽车工业受到越来越大的压力，以减少CO排放和提高内燃机的燃料效率。可以以多种方式实现改进。在整个发动机循环中，除了泵送损失之外，寄生损失还源自所有发动机接触结合部中的摩擦。特别是一个主要的贡献连接是活塞环包组件。在低发动机转速下，与热力学损失相比，摩擦对发动机内总损失的贡献显著增加。此外，环的密封能力在确定发动机的功率输出方面是至关重要的，任何密封损失都会导致功率损失以及漏气。现有的压缩环-柱连接件的研究大多没有考虑复杂的环的面内和面外弹性动力学。迄今为止，还没有一个数值方法，集成摩擦学的弹性压缩环，在耦合的解决方案中的模态行为。本文讨论了包括瞬态环弹性动力学的顶部压缩环，相互作用的漏气影响内的环包。环动力学方法简要强调了平面内和平面外的运动。此外，一维气体流动模型，捕捉漏气行为包括在内。一个案例研究，使用实测发动机数据。在不同的发动机转速下的气体流量和摩擦损失的预测。可以确定漏气对环的摩擦学响应的影响，以及环在其保持槽内的动态运动。版权所有© 2014 SAE International.
The automotive industry is subject to increasing pressure to reduce the CO emissions and improve fuel efficiency in internal combustion engines. Improvements may be achieved in a number of ways. The parasitic losses throughout the engine cycle emanate from friction in all engine contact conjunctions in addition to pumping losses. In particular one main contributory conjunction is the piston ring pack assembly. At low engine speeds, the contribution of friction to the total losses within the engine is increased significantly compared with the thermodynamic losses. Additionally, the sealing capability of the ring is crucial in determining the power output of the engine with any loss of sealing contributing to power loss, as well as blowby. Most reported studies on compression ring-cylinder conjunction do not take into account complex ring in-plane and out-of-plane elastodynamics. Hitherto, there has not been a numerical methodology which integrates tribology of an elastic compression ring, subject to modal behaviour in a coupled solution. This paper discusses the inclusion of transient ring elastodynamics of the top compression ring, interacting with blowby effects within the ring pack. The ring dynamics methodology is briefly highlighted for both in-plane and out-of-plane motions. In addition, a one-dimensional gas flow model that captures blowby behaviour is included. A case study is presented, using measured engine data. Gas flow and frictional losses at various engine speeds are predicted. The effect of gas blowby on the ring's tribological response can be ascertained, as well as the ring's dynamic motion within its retaining groove. Copyright © 2014 SAE International.