Fiber-optic integrated aerodynamic three-hole vector probe for high-velocity flow field measurement

An integrated aerodynamic three-hole pressure probe (THP) based on a fiber-optic tip sensor array for high-velocity flow field vector measurement is developed and demonstrated in wind tunnel testing. The sensor array consisting of three miniature pressure fiber-tip sensors is integrated into three pressure conduits inside top area of the THP, which serves to mitigate pneumatic pressure loss and is expected for a more reliable analysis of flow characteristics. Fast real-time data acquisition is implemented by a compact self-developed multichannel white light interferometry (WLI) interrogator. Well-calibrated maps of the fiber-optic THP are developed in a subsonic free-jet wind tunnel to derive the velocity vectors in a yaw angular range of +/- 15 degrees at Mach numbers of 0.2 Ma (similar to 70 m/s), 0.5 Ma (similar to 170 m/s), and 0.8 Ma (similar to 300 m/s) while related flow characteristics are analyzed. This work is desired to provide a potential candidate for turbomachinery experimental investigation in fluid mechanics community.

Automated summary

An integrated aerodynamic three-hole pressure probe based on a fiber-optic tip sensor array has been developed for high-velocity flow field vector measurement. The probe consists of three miniature pressure fiber-tip sensors integrated into three pressure conduits to reduce pneumatic pressure loss and improve the reliability of flow analysis. Fast real-time data acquisition is achieved using a self-developed multichannel white light interferometry interrogator.