CAJ | 학술논문

基于有限元有限体积法和全隐式多网格耦合算法,对某汽轮机高压级有一定扭曲度的静叶栅流场进行了三维稳态数值模拟,分析计算了叶栅通道内上下端壁二次流发展的特点及叶栅的气动特性。计算结果表明,叶栅端壁二次流损失与叶型型面及上下端壁面的汽流情况有密切关系。同时揭示了叶栅通道内的涡系演变特点,发现在流道尾部二次流强度发展迅速,在靠近背弧上下端部附近形成两个明显漩涡区,进而引起总压损失系数和出口汽流角沿叶高方向产生明显变化,这对存在一定扭曲度叶栅的气动特性研究及设计有一定的指导意义。
기우유한원유한체적법화전은식다망격우합산법,대모기륜궤고압급유일정뉴곡도적정협책류장진행료삼유은태수치모의,분석계산료협책통도내상하단벽이차류발전적특점급협책적기동특성。계산결과표명,협책단벽이차류손실여협형형면급상하단벽면적기류정황유밀절관계。동시게시료협책통도내적와계연변특점,발현재류도미부이차류강도발전신속,재고근배호상하단부부근형성량개명현선와구,진이인기총압손실계수화출구기류각연협고방향산생명현변화,저대존재일정뉴곡도협책적기동특성연구급설계유일정적지도의의。
The paper is based on finite element finite volume method and fully implicit multigrid coupling algorithm,high pressure level of a steam turbine with a certain degree of distortion of the static cascade flow field in three-dimensional numerical simulation of steady-state,the paper analyses and calculates the developmental characteristics of the secondary flow in the lower wall of the cascade channels and the aerodynamic characteristic of the cascade.The calculated results show that the secondary flow loss of cascade endwall is bound up with type surface of leaf type and the lower wall.Meanwhile,the calculated results reveals the characteristic of evolution of vortices in cascade channels,it finds that the strength of secondary flow develops rapidly,two obvious vortex area formed nearly the blade convexity of the upper and lower changes the total pressure loss coefficient and exit flow angle along the leaves high direction,the conclusions are instructive in studying on aerodynamic characteristics of cascade with certain distortion degree and designing.