基于双吸叶轮两侧非均衡进气研究轮盘凸台尺寸影响

陈 山; 老大中; 赵 奔; 杨 策; 鲍 珂; 张继忠

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基于双吸叶轮两侧非均衡进气研究轮盘凸台尺寸影响
陈山¹,老大中²,赵奔¹,杨策¹,鲍珂³,张继忠⁴
(1．北京理工大学机械与车辆学院,北京 100081; 2．北京理工大学宇航学院,北京 100081; 3．中国北方车辆研究所一部,北京 100072; 4．中国北方发动机研究所柴油机增压技术重点实验室,山西大同 037036)

摘要:

为明确双吸叶轮两侧叶轮之间的径向轮盘凸台尺寸变化对其总体性能及内部流场的影响,探索不同尺寸轮盘结构叶轮的流动损失机理,基于双吸叶轮两侧非均衡进气条件,采用数值方法对五种径向轮盘尺寸双吸叶轮的三维粘性流场进行了模拟研究。研究结果表明:从双吸叶轮最优性能及最高流动稳定性观点出发,均要求两侧叶轮之间的径向轮盘凸台超出叶片尾缘一定范围；具体超出尺寸范围则需要通过对双吸叶轮的压比、效率性能目标进行折衷确定。径向轮盘凸台尺寸的改变明显影响双吸叶轮两侧叶轮的流量分配,进而影响扩压器内分离流动损失大小及双吸叶轮的整体性能。另外,相比于较大径向轮盘凸台,无径向轮盘凸台结构更容易造成双吸叶轮两侧叶轮流量差距悬殊。 

关键词: 双吸叶轮径向轮盘凸台非均衡进气数值模拟流动特性 

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基金项目:国家自然科学基金项目资助(51276017);教育部博士点基金(20101101110009)。

Effects of Hub Radial Portion Scale on Performance of a Double-Sided Centrifugal Compressor Impeller under Un-Equilibrium Inlet Condition

CHEN Shan¹, LAO Da-zhong², ZHAO Ben¹, YANG Ce¹, BAO Ke³, ZHANG Ji-zhong⁴

(1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2. School of Aerospace Scientific Engineering, Beijing Institute of Technology, Beijing 100081, China;3. China North Vehicle Research Institute, Beijing 100072, China;4. Science and Technology on Diesel Engine Turbocharging Laboratory, China North Engine Research Institute, Datong 037036, China)

Abstract:

To expose the effects of hub radial portion scale in a double-sided centrifugal compressor impeller on performance and inside flow structure, numerical simulation was carried out on a double-sided impeller with five different hub radial portion scales under un-equilibrium inlet condition. The simulation results show that, the hub radial portion is expected to exceed blade trailing edge, from both performance and flow stability standpoint. The best hub radial portion scale should be optimized based on impeller pressure ratio and efficiency performance compromise. The hub radial portion directly affects the double-sided impeller mass flow rate in both sides, hence the impeller performance. Due to the effect on the mass flow rate, different hub radial portion configuration can modify separation flow in downstream diffuser. The minimum hub radial portion impeller configuration tends to make the mass flow rate between front side and rear side unbalanced more easily than any other configurations. 

Key words: Double-sided impeller Hub radial portion Un-equilibrium inlet condition Numerical simulation Flow characteristic