中南大学学报（自然科学版）2023，Vol.54Issue(12)：4901-4916,16.DOI:10.11817/j.issn.1672-7207.2023.12.027
轨道车辆冰雪风洞收缩段曲线对试验段流场特性的影响
Effect of contraction section curves on flow characteristics inside test section of ice and snow wind tunnel for railway vehicles
摘要
Abstract
The IDDES turbulence model based on SST k-ω was used to study the air flow quality in the passage of the ice and snow wind tunnel for rail vehicles,and the influence of the constraction curve on the flow field quality in the test section was analyzed.The reliability of calculation accuracy,grid independence validation and turbulence model adaptability of the numerical method in this paper were verified by the wind tunnel flow field calibration data.The results show that in the original case,due to the flow separation at the inlet of the contraction section behind the corner deflector,the airflow velocity is in zigzag distribution;no obvious flow separation occurs before the nozzle of the test section,and the area where the velocity in the test section is uniformly distributed.The momentum exchange between the nozzle jet and its surroundings leads to low velocity,and increases vorticity and high turbulence intensity.In different cases of contraction section curves,the witozinsky curve shrinks too fast at the entrance of the contraction section,resulting in poor velocity uniformity of this section.The witozinsky curve has a greater impact on the first order variables such as velocity,pitch angle,yaw angle,etc.,and the bicubic curve has a greater impact on the second order variables.Therefore,the quintic curve is more effective to ensure the flow field quality by comprehensivelyconsidering the key parameters setting strategy of the aerodynamic profile of the wind tunnel contraction section.关键词
转向架冰雪风洞/数值模拟/收缩段曲线/流场品质/IDDESKey words
ice snow wind tunnel for bogie/numerical simulation/curve of contraction section/flow field quality/IDDES分类
交通工程引用本文复制引用
王家斌,高广军,张琰,刘操,商雯斐,于尧..轨道车辆冰雪风洞收缩段曲线对试验段流场特性的影响[J].中南大学学报（自然科学版）,2023,54(12):4901-4916,16.基金项目
国家自然科学基金资助项目(52202429,U2268217) （52202429,U2268217）
湖南省自然科学基金资助项目(2023JJ40747)(Projects(52202429,U2268217)supported by the National Natural Science Foundation of China （2023JJ40747）
Project(2023JJ40747)supported by the Natural Science Foundation of Hunan Province) （2023JJ40747）
