397 / 2018-12-21 18:13:35

Design Method of a New Swirl Distortion Generator Based on Swirl at The Exit of S-shaped Inlet/一种新型旋流畸变发生器设计方法 ——基于S弯进气道出口旋流

Swirl distortion, S-shaped inlet, distortion generator/旋流畸变，S弯进气道，畸变发生器

全体主题 > 数值模拟、建模与CFD

In order to study the influence of the swirl distortion generated by the S-shaped inlet on engine performance and stability. Here propose a new design method for swirl distortion generators. Take the exit section of M2129 S-shaped inlet as the target flow field. Design the chord length, installation Angle and support device according to the conditions as consistency, velocity and flow Angle of the target flow filed. And use CFD technology to simulate and analyze the generated flow filed in detail. The results show that: The average deviation of the swirl Angle of the three measuring rings in AIP is 0.99°、0.67°、1.71°，and the overall average deviation is 1.12°； The influence of Mach number on the swirl Angle of the swirl distortion generator simulation is very small, and the influence of Mach number on the swirl Angle can be ignored in the range of 210°to 330°. In the full circumferential range, when the Mach number of the airflow is closer to the Mach number of the target flow filed, the error between the swirl Angle obtained by the distortion generator and the swirl Angle of the target flow filed is smaller. The outlet section of the distance is selected as 50mm、63mm、70mm and 80mm, it is found that with the development and mixing of airflow downstream, the swirl Angle decreases and the vortex core has a small upward deviation. The swirl distortion was qualified by using swirl sector, swirl intensity swirl direction and number of swirl groups, finally, it is found that the flow filed obtained by the distortion generator is highly consistent with the target flow filed./为研究S弯进气道产生的畸变流场对发动机性能和稳定性的影响，在此提出一种新型旋流畸变发生器的设计方法。将M2129型S弯进气道出口截面流场作为目标流场，根据稠度和目标流场的速度及气流角等条件设计弦长、安装角及支撑等装置，设计得到旋流畸变发生器，利用CFD技术对畸变发生器仿真计算，对产生的流场进行详细的分析研究。结果表明：在AIP三个测环旋流角平均偏差分别为0.99°、0.67°、1.71°，总体平均偏差为1.12°；马赫数对旋流畸变发生器仿真旋流角的影响极小，在210°到330°重点仿真的范围内的影响可以忽略不计。在全周向范围内，当气流马赫数越接近目标旋流场的马赫数时，畸变器得到的旋流角与目标流场旋流角误差越小；选取距离旋流畸变器出口截面为50mm、63mm、70mm以及80mm四个截面，发现随着气流向下游的发展及掺混，旋流角变小，涡核向上有小的偏移；利用旋流扇区、旋流强度、旋流方向和旋流组数将旋流畸变量化，发现畸变器得到的流场与目标流场高度吻合。