Blade deformation and PSP measurements on the large scale rotor by videometric system

Helicopter's blade during its rotation accomplishes a complex spatial movement and deformation. The first part of the report is devoted to Blade Deformation Measuring System (BDMS), which was developed to measure parameters of blade movement and its bending-twisting deformation. This part describes the measurement system and the basic measurement principles. Results of the laboratory investigations are discussed as well. Pre prototype of the BDMS was investigated in TsAGI's T-101 wind tunnel. BDMS provides twisting deformation measurement with mean squared deviation (MSD) about 3-6 angular minutes and linear displacement measurements with MSD about 0.3-0.6 mm for real scale helicopter rotor. The second part describes results of the evaluation tests with Pressure Sensitive Paint, which were conducted by pressure measurement extension of the BDMS. The first results obtained during the wind tunnel tests are presented and compared with pressure port data.