摘要
针对柴油机两级增压旁通阀大范围高精度调节特性需求,开展了增压旁通偏置异型阀阀瓣型线优化设计研究,实现了等百分比流量调节特性,解决了通用快开型废气旁通阀流量调节精度低的问题,并且具有等百分比流量特性的旁通阀可以实现控制参数在全开度范围内的一致。针对不同异型阀结构,进行了流量调节特性分析,提出了多截面混合阀设计方法,通过多种阀门流量特性试验,验证了多截面混合阀有效调节范围。研究表明,优化设计的多截面混合阀流量特性与等百分比流量特性最接近,最大有效相对开度为0.73,为通用平面旁通阀的2.6倍,增益变化率缩小,大幅提升了调节精度,多截面混合阀可显著改善增压压力的调节特性,能够平稳且有效地控制可调两级增压系统的增压压力。
Aiming at the requirement of wide range and high precision regulation characteristics of marine diesel engine two-stage turbocharging by-pass valve,the optimization design research of offset specialshaped by-pass valve disc was carried out to realize the equal percentage flow regulation characteristics,which solves the problem of low flow adjustment accuracy of universal quick-open by-pass valve.And the bypass valve with equal percentage flow characteristics can achieve consistent control parameters within the full opening range.According to the different special-shaped valve structures,the flow regulation characteristics were analyzed,and the design method of multi-cross section mixing valve was put forward.Through the flow characteristic test of various valves,the effective adjustment range of multi-cross section mixing valve was verified.The research shows that the flow characteristics of the optimized multi-cross section mixing valve are the closest to the equal percentage flow characteristics.The maximum effective relative opening is 0.73,which is 2.6 times that of the general plat by-pass valve.The gain change rate is reduced and the regulation accuracy is greatly improved.It shows that the multi-cross section mixing valve can significantly improve the regulation characteristics of the boost pressure,and can effectively and smoothly control the boost pressure of the adjustable two-stage turbocharging system.
作者
冷泠
程江华
王振彪
刘胜
石磊
邓康耀
LENG Ling;CHENG Jianghua;WANG Zhenbiao;LIU Sheng;SHI Lei;DENG Kangyao(Key Laboratory for Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China;China North Engine Research Institute,Tianjin 300400,China)
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2021年第2期89-94,103,共7页
Chinese Internal Combustion Engine Engineering
基金
国防科技重点实验室基金项目(9140C330207150C33148)。
关键词
两级涡轮增压系统
异型旁通阀
多截面混合阀
流场特性
调节特性
two-stage turbocharger system
special-shaped by-pass valve
multi-cross section mixing valve
characteristics of flow field
regulation characteristic
