摘要
针对水轮机转轮单向流固耦合和双向流固耦合计算结果的比较问题,建立了精确的水轮机流场及结构场模型,分别对低水头、低转速和高水头、高转速两种工况下转轮单向、双向流固耦合进行了数值模拟。对比了两种工况在单向、双向耦合时转轮表面流体域的最大压力、最大速度及转轮结构域的最大应力、最大应变、最大总位移,最后结合流固耦合公式对计算结果作了进一步的分析。研究结果表明,在使用单向流固耦合进行数值计算时,流固耦合作用越强,则计算偏差越大;通过同一流场和结构场的单向流固耦合和双向流固耦合计算值对比可知,无论是流体域还是结构域的计算值,相同节点的单向耦合计算值均小于理论上更为精确的双向耦合计算值。
Aiming at comparing the result between one-way and two-way FSI numerical computation of Francis turbine runner, the accurate fluid field and structure field were modeled. Two conditions of low head, low speed and relatively high head, high speed of one- way and two-way FSI were simulated. The maximum pressure, velocity of the fluid field around the runner and the maximum stress, strain, total displacement of the runner in different simulation were compared. Based on the comparison and deeper analysis on the FSI formula, the results indicate that the stronger the fluid-structure interaction is in the one-way FSI numerical simulation, the larger the numerical error is. On same of fluid field, structure field, initial condition, boundary condition and mesh genaration, the value of one-way FSI is smaller than that of two-way FSI which is more accurate in theory on the same node, whatever in the fluid field or in the structure field.
出处
《机电工程》
CAS
2014年第12期1564-1568,共5页
Journal of Mechanical & Electrical Engineering
基金
浙江省水利厅重点科技资助项目(RB1217)
浙江省水利厅一般科技资助项目(RC1348)
浙江省科技厅研究计划资助项目(2013C32020)
关键词
混流式水轮机
转轮
单向
双向
流固耦合
数值分析
francis turbine
runner
one-way
two-way
fluid-structure interaction（FSI）
numerical analysis
