CAJ | 학술논문

基于Realizable k-epsilon的分离涡湍流模型，研究在固定地面、滑移地面和轮转兼滑移地面3种情况下，动车组车轮气动性能，对比分析这3种边界条件对车轮数值模拟的影响。研究结果表明：与固定地面情况相比，计算得到的列车总阻力在滑移地面兼车轮转条件下增加了约29．3％，滑移地面条件下增加了约2．76％；轮转兼滑移地面情况下得到的气动升力与力矩绝对值均大于其他2种情况下的；滑移地面和固定地面条件下，车轮周围流场结构相似，尾涡主要从车轮两侧分离并向后发展、脱落，2种情况下车轮表面和后部区域压力分布规律相似；轮转边界条件下，车轮旋转带动车轮后部气流上扬，流速加快，该条件下车轮周围涡量主要从顶部分离并向后发展，影响了车轮表面和后部区域压力分布。
기우Realizable k-epsilon적분리와단류모형，연구재고정지면、활이지면화륜전겸활이지면3충정황하，동차조차륜기동성능，대비분석저3충변계조건대차륜수치모의적영향。연구결과표명：여고정지면정황상비，계산득도적열차총조력재활이지면겸차륜전조건하증가료약29．3％，활이지면조건하증가료약2．76％；륜전겸활이지면정황하득도적기동승력여력구절대치균대우기타2충정황하적；활이지면화고정지면조건하，차륜주위류장결구상사，미와주요종차륜량측분리병향후발전、탈락，2충정황하차륜표면화후부구역압력분포규률상사；륜전변계조건하，차륜선전대동차륜후부기류상양，류속가쾌，해조건하차륜주위와량주요종정부분리병향후발전，영향료차륜표면화후부구역압력분포。
The aerodynamic performance of wheel of high-speed train was investigated under stationary ground, moving ground and moving ground with rotating wheel conditions by using DES based on Realizable k-epsilon e-quation.The influence of different ground boundary conditions on the result of numerical simulation was ana-lyzed.The results shows that the total drag force calculated under the moving ground and rotating wheel condi-tions increases 29.3%,and under moving ground condition increases 2.76%,comparing with that under sta-tionary ground condition.And the absolute value of total lift force and moment are bigger than other situations. The flow field structures under stationary condition around the wheel are similar to that in moving wall condition, which leads to the pressure distribution of the wheel and behind the wheel similar.Shed wake vortexes are pro-duced mainly in the two side of the wheel and progress backward.While the flow field structure changes under the rotating wheel condition where airflow behind the wheel rises and flows rapidly with the wheel rotating.The vortexes are mainly separated from the top of wheel and progress backward,which influences the pressure distri-bution of the wheel and behind the wheel.