超声速颤振风洞试验技术研究

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。

Research on flutter test technique in supersonic wind tunnel

When the wind tunnel starts or ends running, there is a large impact load which could damage the flutter model easily. In order to solve the problem, a supersonic flutter insertion system is developed in FL-23 wind tunnel of CARDC. During the flutter tests, the insertion system pushes the model into the flow after the impact load disappears, and at the end of the tests or if the flutter occurs, the insertion system pulls the model back quickly. The test results show that the insertion system could protect the flutter model from damage effectively and ease the intensity limit of the model. The dynamic pressure achieved from the subcritical prediction is close to the flutter test result. As a conclusion, a practical supersonic flutter testing platform has been established in CARDC.