Development of coaxial rigid rotor test stand for Φ3.2m wind tunnel

To meet the needs of the wind tunnel experiment, China aerodynamics research and development center successfully developed the Φ3.2 m coaxial rigid rotor stand for wind tunnel experiments. The test of coaxial rigid rotor models with a diameter of 2 m can be carried out on this test stand. The upper and lower rotors are supported separately and rotate conversely. The coaxial rotor test stand realizes remote and synchronous real-time control over the rotor shaft angle, collective and cyclic pitch, and so on. From the iteration cycle of simulation-test-adjustment, dynamic issues of the test stand are addressed. The design parameters of the transmission system are selected carefully to guarantee the stability. The wind tunnel test results of the model coaxial rigid rotor show that the repeatability precision of thrust can be better than 0.58%, and the repeatability precision of torque can be better than 0.11%.