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颤振试验中,为避免暂冲式超声速风洞起动/关车过程中的冲击载荷损坏复合材料模型,依托FL-23风洞研制了一套超声速颤振投放系统。该系统的主要功能是在超声速流场建立后能够快速将模型投入流场,并在试验完成或模型振动临近发散时将模型收回。试验结果表明,该投放系统能够有效防止风洞起动/关车冲击载荷损坏模型,放宽了对超声速颤振试验模型强度的限制;亚临界预测的颤振临界速压与风洞试验直吹颤振结果一致;初步建立了工程实用的超声速颤振试验平台。
In the flutter test, a set of supersonic flutter delivery system was developed based on the FL-23 wind tunnel in order to avoid the damage of the composite material caused by the impact load during the start-up / shut-down of the transient-type supersonic wind tunnel. The main function of the system is to quickly put the model into the flow field after the supersonic flow field is established and retract the model when the experiment is completed or the model vibration is near divergence. The experimental results show that the system can effectively prevent the impact load damage model of the wind tunnel from starting and closing, and relax the restriction of the strength of the experimental model. The sub-critical predicted flutter critical pressure and wind tunnel test flutter The results are consistent; initially established engineering practical ultrasonic flutter test platform.