摘要
某高速艇用柴油机的油气分离器功能试验中出现了出气含油量高的问题。经分析,主动式油气分离器驱动油的回油直接落在齿轮系顶部,被齿轮系搅动,导致齿轮室油雾浓度过高;同时,齿轮室上的油气分离器取气位置距离齿轮过近,且取气口缺乏遮挡结构。以上两点因素共同导致油气分离器初始进气含油量过大,超出了主动式油气分离器的设计要求限值。为解决问题,采取了以下改进措施:在齿轮室增加了油气分离器驱动油回油导流结构,对回油进行引导;对取气口位置的齿轮进行了半包裹遮挡,以减少油雾的直接进入;在取气口加装了高档油筋,以降低从取气口位置进入油气分离器的油滴数量;此外,新增加了一个预分离腔,对大油滴进行了进一步的过滤。经计算流体动力学(CFD)仿真分析,预分离腔对10μm以上的大油滴分离效果较好。试验验证表明,结构改进后的油气分离器出气含油量已满足限值要求,改进措施有效。
During the functional test of the oil-gas separator for a high-speed boat diesel engine,a problem of high oil content in the exhaust gas occurred.Upon analysis,the return oil from the active oil-gas separator's drive oil directly falls onto the top of the gear train and is stirred by the gear train,leading to an excessively high concentration of oil mist in the gear chamber;Meanwhile,the air intake position of the oil-gas separator on the gear chamber is too close to the gear,and the air intake lacks a shielding structure.The above two factors jointly lead to excessive oil content in the initial intake air of the oil-gas separator,which exceeds the design limit of the active oil-gas separator.To solve the problem,the following improvement measures have been taken:adding a drive oil return flow guide structure for the oil-gas separator in the gear chamber to guide the return oil;The gear at the gas intake position is partially covered to reduce the direct entry of oil mist;A high-grade oil rib is installed at the gas inlet to reduce the amount of oil droplets entering the oil-gas separator from the gas inlet position.In addition,a new pre-separation chamber has been added to further filter large oil droplets.Based on CFD simulation analysis,the pre-separation chamber has a good separation effect on large oil droplets above 10μm.Through subsequent experimental verification,the oil content in the gas outlet of the improved oil-gas separator has met the limit requirements,proving that the improvement measures are effective.
作者
秦伟
侯晓良
李洪亮
侯斌
赵帅
李丹
QIN Wei;HOU Xiaoliang;LI Hongliang;HOU Bin;ZHAO Shuai;LI Dan(Weichai Power Co.,Ltd.,Weifang 261061,China)
出处
《内燃机》
2024年第6期39-45,共7页
Internal Combustion Engines
作者简介
秦伟(1982-),男,硕士,高级工程师,主要研究方向为船用高速柴油发动机设计开发,E-mail:qinw@weichai.com。
