Tomo-PIV亚跨声速风洞应用探索

Application exploration of Tomo-PIV in the subsonic and transonic wind tunnel

层析粒子图像测速技术(Tomographic Particle Image Velocimetry,Tomo-PIV)是将PIV技术和计算机断层诊断技术(CT)相结合的一种瞬时三维流场速度测量技术,能够定量获取流场的三维结构。通过对该技术的研究,实现了其在亚跨超声速风洞的应用,并进行了超临界翼型小肋减阻的试验验证。基于中国航天空气动力技术研究院FD-12亚跨超声速风洞,设计了体光源和相机等硬件设备的布局方案,解决了示踪粒子的均匀播撒问题,测量了Ma=0.6条件下的自由来流流场,并与PIV测试结果进行对比,两者数据吻合较好,验证了Tomo-PIV的测量精度。针对超临界翼型OAT15a,测量了翼型表面分别贴附光滑薄膜和顺流向对称V形小肋薄膜后翼型尾缘后方的三维速度场。对比发现,贴附小肋薄膜后尾缘后方流场的马赫数增大,说明小肋能够减小翼面摩擦阻力,具有一定的减阻效果。

Tomographic Particle Image Velocimetry(Tomo-PIV)is a kind of instantaneous velocity measurement technology combined PIV and computer tomography(CT),which can quantitatively obtain the three-dimensional structure of the flow field.It is successfully applied in the subsonic,transonic and supersonic wind tunnel and the supercritical airfoil verification experiment about riblets drag reduction was carried out.The layout of body light and camera is designed based on the situation of FD-12 wind tunnel in China Academy of Aerospace Aerodynamics.The free flow field under the condition of Ma=0.6 is measured by solving the problem of the uniformity diffusion of tracer particle,and compared with the test results of PIV.The data of both accord well,verifying the accuracy of Tomo-PIV.Meanwhile,the three dimensional velocity field in the rear of trailing edge is measured by attaching the smooth film and symmetrical riblets film respectively which used supercritical airfoil OAT15 aas the carrier.The results reveal that the Mach number of the measurement field increases after attaching the riblets film.It shows that the riblets film can reduce the friction resistance of the wing and has certain drag reduction effect.