摘要
针对应用于车用发动机有机朗肯循环余热回收系统的某型涡旋膨胀机,基于原型机工作腔流场结构和温度分布对涡旋齿变形的影响特点,提出采用与原型机基本几何结构参数相同的变径基圆涡旋型线的设计方案,对比分析改型前、后的涡旋膨胀机排气腔和背压腔流场以及温度场分布的差异,研究改型前、后两膨胀机变形特性的差异.结果显示:改型后的膨胀机削减了两侧背压腔内部气流微团的摩擦和旋涡二次流的机械能损耗,排气腔与背压腔压力及温度分布更均匀;改型后的涡旋膨胀机拥有与原型机相似的工作能力、更小的工作腔空间、更高的等熵效率和更小的变形量.
A scroll expander of involute of circle with variable radii was proposed according to the flow field in working chambers and deformation characteristics of the conventional scroll profile.The proposed scroll expander has the same basic geometric parameters as the conventional scroll expander and was used in the waste heat recovery system of organic Rankine cycles(ORC)of a vehicle engine.Compared to the conventional scroll profile,the involute of circle with variable radii reduces the frictions of gas parcels and the mechanical energy loss,weakens the secondary flow losses in both sides of the back pressure chamber,and makes the pressure and temperature distributions of the exhaust chambers and the back pressure chambers more uniform.The scroll expander with the involute of circle and variable radii has the same working ability as the scroll expander with the conventional scroll profile.Furthermore,the scroll expander with the involute of circle and variable radii has smaller space of the working chambers,higher isentropic efficiency and smaller deformation.
作者
刘祯
吴华伟
宋盼盼
魏名山
Liu Zhen;Wu Huawei;Song Panpan;Wei Mingshan(Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle,Hubei University of Arts and Science,Xiangyang 441053,China;School of Automotive and Traffic Engineering,Hubei University of Arts and Science,Xiangyang 441053,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2020年第1期73-80,共8页
Transactions of Csice
基金
北京市自然科学基金资助项目(3194057)
湖北省技术创新专项重大资助项目(2017AAA133)
湖北省优势特色学科群开放基金资助项目(XKQ2019010,XKQ2019016)
关键词
发动机余热回收
涡旋膨胀机
流-热-固耦合
waste heat recovery system of vehicle engine
scroll expander
fluid-thermal-solid coupling
