Test Investigation on Rotor Automatic Trim in Wind Tunnel
Aiming at the requirements on helicopter rotor automatic trim in wind tunnel test,a rotor wind tunnel test system is built,and an automatic trim method for rotor wind tunnel test based on Newton-Raphson method is developed.According to the different trimming requirements on hovering and forward flight,the corresponding trimming strategy is formulated,and the 1.5m rotor model wind tunnel test research is carried out in the FL-52 wind tunnel under different conditions of hovering and forward flight.The results show that the relative error of CT is less than 0.8%under different hovering conditions,the relative error of CT is less than 3%under different forward flight,the hub torque Mx,Mz is controlled within 1.5N·m,and with the increase of CT,the trimming accuracy is gradually improved.It can be seen that the close-loop control of the trim process is realized and the automation level of trimming is improved.This method is suitable for rotor wind tunnel test.
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