摘要
涡轮增压器蜗壳在周期性冷热交变的载荷下工作,容易产生热应力,导致蜗壳产生热机疲劳开裂,从而影响发动机性能甚至功能性失效。文章在传统的柴油发动机涡轮增压器研究的基础上,对新型的天然气发动机涡轮增压器进行了研究。通过实验研究气体与金属换热及对流情况,建立了气体与固体热交换模型,此模型可为后续的热机疲劳分析提供换热边界。同时对蜗壳进行了热机疲劳有限元数值分析,并与柴油发动机涡轮增压器蜗壳热机疲劳模型进行对比,根据分析结果,提出了天然气发动机涡轮增压器蜗壳冷热冲击试验的参考标准及蜗壳材料选择的指导性意见。
The turbocharger volute is easy to generate thermal stress in case of working under the load of periodic cold and hot alternation which will lead to thermo-mechanical fatigue cracking of volute and influence engine performance and even cause functional failure.This article researched new natural gas engine turbocharger on the basis of research of traditional diesel engine turbocharger.The gas and sol-id heat exchange model was established which could provide heat exchange boundary for subsequent heat engine fatigue analysis according to situation of experiment research gas,metal heat exchange and convection current.Meanwhile finite element numerical analysis of heat engine fatigue for the volute was done which was compared with heat engine fatigue model of diesel engine turbocharger volute and the reference standard for hot and cold impact experience of natural gas engine turbocharger volute and guidance suggestion of volute material selection had been put forward according to analysis results.
出处
《西部交通科技》
2015年第10期104-108,112,共6页
Western China Communications Science & Technology
