基于有限元的金属飞轮结构设计优化  

Structural design and optimization of metallic flywheel based on FEM

作　　者：汪勇[1] 戴兴建[1] 孙清德 

机构地区：[1]清华大学工程物理系,北京100084 [2]中石化中原石油工程有限公司,河南濮阳457001

出　　处：《储能科学与技术》2015年第3期267-272,共6页Energy Storage Science and Technology

基　　金：国家科技支撑计划(2014BAA04B02);清华大学自主科研计划(20111081032)项目

摘　　要：金属飞轮功率密度大,可靠性高,是我国推广飞轮储能技术应用的重要途径。本文综合考虑应力强度、金属疲劳、储能总量、储能密度和加工工艺,依托有限元计算优化金属飞轮设计,以应对不同工况要求。飞轮材料选用35Cr Mo A,设计储能量大于20 k W·h。频繁充放电飞轮采用4倍安全系数,具备高可靠性;高速待机飞轮以疲劳极限强度作为设计准则,平衡储能量和寿命。计算对比发现,"哑铃"形截面有利于实现轻质量大转动惯量,相同储能量下降低轴承负荷。此外,文章依托模块化设计思想,提出叠层铆合飞轮设计,评估轴孔螺孔应力集中影响。上述讨论为低速大功率金属飞轮进一步设计和量产化提供了有力参考。Adopting metallic flywheels is an important way to promote the applications of flywheel energy storage for its superiorities in power density and reliability. This study is aimed to design and optimize metallic flywheel with FEM, considering stress intensity, metal fatigue, energy storage capacity, energy density and processing technology comprehensively. The designed energy capacity was beyond 20 kW.h using the alloy 35CrMoA. Frequent charge-discharged flywheels use 4 times the safe coefficient to realize high reliability, while high-speed standby flywheels took Fatigue ultimate strength as the criterion to balance the energy capacity and lift-time. By contrast, the dumbbell-shaped cross-section was conducive to a larger moment of inertia with a lighter weight, benefitting for reducing the beating load. Besides, this paper proposed a novel design of lamina-riveted flywheel, and accessed the influence of the axle hole and screw holes. All the above discussion provided available references for the further design and mass production of low-speed/high-power metallic flywheels.

关 键 词：金属飞轮 储能 安全系数 哑铃截面 叠层铆合飞轮 

分 类 号：TM02[电气工程—电工理论与新技术]