储能飞轮轮毂的蠕变温度特性与蠕变影响  

Creep temperature characteristics and influence of hub design in an energy storage flywheel

作　　者：于涵[1] 戴兴建[1] 沈祖培[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2006年第6期805-808,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为提高储能飞轮可靠性,并延长寿命,研究了储能飞轮铝合金轮毂的蠕变温度特性。采用宏观唯像分析方法,通过轮毂在不同温度、不同转速下的蠕变实验,拟合了包含应力、时间、温度等变量在内的完整的反映飞轮轮毂在低温条件下(75℃以下)蠕变规律的蠕变方程。并用有限元分析的方法对飞轮轮毂在工作条件下的蠕变过程进行了模拟。分析结果表明,在40℃的高真空环境下以转速5×104r/m in运行的储能飞轮,在20 a的寿命期内可以忽略铝合金材料蠕变因素对其强度和寿命的影响。The creep temperature characteristics of an aluminum alloy hub in an energy-storage flywheel were investigated to improve flywheel safety and prolong flywheel life-span. Creep measurements at various temperatures and rotational speeds were used to develop a creep equation integrating stress, time, and temperature in a macro-phenomenological analysis method. The low-temperature （75℃） creep of the flywheel hub was well simulated by the creep equation. The flywheel hub creep was then simulated for working conditions using an FEM analysis. The results show that the effect of aluminum alloy creep on the strength and life-span of an energy-storage flywheel can be ignored for temperatures less than 40℃ at high vacuum and speeds of 5 × 10^4 r/min for 20 years.

关 键 词：蠕变 持久强度 储能飞轮 轮毂 

分 类 号：TB125[理学—工程力学]