Development of Time-resolved Multi-physical Field Measurement Techniques for High-speed Flows
F. Gu(1), N. Zhou(2), J. Chen(1), Y. Duan(2), Y. Liu(1), D. Peng(1)
1: Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
2: Science and Technology on Space Physics Laboratory, Beijing, China
DOI:
Fluid-structure interaction in high-speed flows involves coupled pressure, temperature, and deformation fields, requiring time-resolved full-field measurements. Although pressure-sensitive paint (PSP), temperature-sensitive paint (TSP), and digital image correlation (DIC) have been widely used, simultaneous measurement of all three fields under high-speed flow conditions remains challenging. This study developed and evaluated two multi-physical field measurement methods. The first was an intensity-based method derived from dual-luminophore PSP, in which the deformation- and temperature-induced intensity variations were compensated by taking the ratio of two emission channels. And stereo DIC was performed using the black speckles sprayed on the coating surface. The second was a lifetime-based method using a multi-physical sensing coating (MPC). The PSP regions and TSP speckles were spatially separated for pressure and temperature measurements, while they jointly served as features for deformation measurement using stereo DIC. The intensity-based method captured instantaneous pressure and deformation fields on a rotating blade, but its performance was limited by insufficient coating strength, intensity inconsistency for DIC, and angle-dependent filter transmission. In contrast, the lifetime-based MPC showed improved coating strength and intensity consistency for DIC. It successfully captured synchronous pressure, temperature, and deformation fields of a flexible wing model at Mach 5, revealing complex FSI phenomenon.
