CAJ | 학술논문

在主油泵的结构设计中,必须从安全的角度考虑转子的静力学和动力学特性限制,并且会采用简化的计算模型来分析这些特性.然而主油泵转子有一些复杂边界条件难以包括在简化模型中,作用在叶轮表面上的油压分布就是其中之一.这不仅会改变运行中转子的固有频率,而且影响转子的应力和变形.为了更精确地分析这些影响,本文采用"流体一结构"耦合法对1000MW汽轮机组润滑油系统主油泵的流场和结构力学性能进行数值模拟,对分别工作在空气和油中的叶轮进行转子静力学和动态响应特性分析.结果表明,在空气和油中该转子的振型类似,在油中随着阻尼增加其固有频率相应的减小,与实际情况一致.本文的研究结果证明所提出的方法是有效的,对类似几何特征的其它泵转子的动态特性分析具有借鉴作用.
재주유빙적결구설계중,필수종안전적각도고필전자적정역학화동역학특성한제,병차회채용간화적계산모형래분석저사특성.연이주유빙전자유일사복잡변계조건난이포괄재간화모형중,작용재협륜표면상적유압분포취시기중지일.저불부회개변운행중전자적고유빈솔,이차영향전자적응력화변형.위료경정학지분석저사영향,본문채용"류체일결구"우합법대1000MW기륜궤조윤활유계통주유빙적류장화결구역학성능진행수치모의,대분별공작재공기화유중적협륜진행전자정역학화동태향응특성분석.결과표명,재공기화유중해전자적진형유사,재유중수착조니증가기고유빈솔상응적감소,여실제정황일치.본문적연구결과증명소제출적방법시유효적,대유사궤하특정적기타빙전자적동태특성분석구유차감작용.
Main oil pump(MOP)is one of the most important equipments for a steam turbine unit.In order to ensure safety.the mechanical design of an MOP is performed according to the static and dynamic characteristics of the rotor,which is usually estimated by a simplified computational model.Nevertheless,the rotor has complex boundary conditions that are difficult to be included in the compfitational model.One of these boundary conditions is the high oil pressure distribution on the impeller,which can considerably modify the natural frequencies of the rotor and meanwhile affects stress and deformation of the rotor.In order to analyze this effect on a MOP rotor of 1000MW steam turbine more accurately,a numerical simulation was carried out using the approach of FSI analysis.The rotor was numerically simulated and the static structural and rotor dynamic response analysis were conducted both in air and in oil.It also shows that the mode shapes in oil are similar to those in air.and the presence of oil reduces the natural frequencies considerably while the damping increases.The approach used in this investigation is proved to be valid,so that it can be extended to the study of the static and dynamic behavior of any other pump rotor with similar geometrical characteristics.