李伟1，2，李国祥1*，张健健2，甄冠富2，王宁宁2，张晓林2,3
1.山东大学能源与动力工程学院，山东 济南 250061；2.康跃科技（山东）有限公司，山东 寿光 262718；
3.机械工业内燃机增压系统重点实验室，山东 寿光 262718
摘要：为识别影响回热试验的重要因素，核实非水冷中间壳增压器回热温度是否在设计限值范围内，分别进行某四缸柴油发动机和增压器台架回热试验，获取增压器关键部位稳定运行及回热温度。试验结果表明：涡前温度为605.5℃，发动机额定工况下，涡端密封环、涡端浮动轴承部位的最高回热温度分别为282.3、241.9℃，涡端密封环部位存在润滑油结焦风险；浮动轴承外间隙、内间隙膨胀量总和分别为0.023 1、0.011 4 mm，满足设计要求；相比额定工况，发动机大转矩工况下的涡前温度、润滑油进油温度分别降低52.4、40.0℃，涡端密封环、浮动轴承部位的最高回热温度分别降低约25.0、11.0℃；涡前温度和润滑油进油温度是影响增压器稳定运行及回热温度的重要因素，涡前温度影响更显著。该试验研究可为增压器温度改进设计提供参考。
关键词：非水冷中间壳；涡轮增压器；回热试验；涡前温度；润滑油进油温度
Abstract：In order to identify the influencing factors of heat regenerative test and verify whether the temperature of the turbocharger with non-water-cooled housing is still within the design limit, the heat regenerative test is carried out on a four-cylinder diesel engine and a turbocharger bench respectively to obtain the temperature of the key parts of the turbocharger during stable operation and heat regenerative text. When the engine with the temperature before the turbine housing of 605.5 ℃ works at the rated condition, the maximum heat regenerative temperatures of the seal ring and floating bearing at the turbine end are 282.3 ℃ and 241.9 ℃ respectively,thus there is a certain risk of coking the lubricating oil at the sealing ring. The total expansion of the outer and inner clearance of the floating bearing are 0.023 1 mm and 0.011 4 mm respectively, which meets the design requirements. Compared with the engine working under rated working condition, when the engine works under high torque working condition, the temperature before the turbine housing and the lubricating oil inlet temperature are reduced by 52.4 ℃ and 40.0 ℃ respectively,the maximum heat regenerative temperature are reduced by about 25.0 ℃ and 11.0 ℃ respectively at the seal ring and floating bearing at the turbine end. The temperature before the turbine housing and the lubricating oil inlet temperature are important factors that affect the temperature of stable operation and the heat regenerative text. The temperature before the turbine housing has a more significant effect. The experimental study can provide reference for improving temperature design of turbocharger.
Keywords:non-water-cooled middle housing; turbocharger; regenerative test;temperature before the turbine housing; temperature of lubricating oil inlet
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