摘要
应用黄仙、倪维斗在《动力工程》第１５卷第６期提出的“复频法”建立了转子动态热应力（热或冷冲击问题）的精确数学模型。该模型改变了以往的转子热应力研究中，不论是有限元法还是解析法，均将问题作“拟静态”处理的思想。更深入地分析了大型汽轮机转子的热应力问题，并以离散相似法对大型汽轮机转子的动态热应力进行了数字仿真。结果表明转子动态热应力不能由“拟静态”热应力表示。在我国电网峰谷差日益扩大，大批２００ＭＷ机组参与调峰运行的情况下，转子动态热应力精确数学模型的建立，为统筹解决调峰机组的灵活、安全性提供了有力的数学工具。
Detailed dynamic mathematical model, with inertia term concened, of thermal stress in large scale steam turbine rotors is developed with the “frequency response approach” proposed by Huang Xian and Ni Weidou in “Power Engineering” (in Chinese) of vol.15, No.6. Computer simulation, by state equations from transfer functions rather than inversion of Laplace Functions, demonstrates that dynamic thermal stress is quite different from one with inertia term ignored. Hence, the dynamic thermal stress mathematical model is a strong mathematical tool to solve the contrary between feasibility and security. It has great practical engineering value as a large number of 200MW units have to take part in cyclic operation.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1996年第10期25-29,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家"攀登计划B"项目
关键词
动态热应力
数学模型
汽轮机
转子
热应力
dynamic thermal stresses
mathematical model
frequency response approach
steam trubine rotors
