| 膜片非理想打开行为对自由活塞激波风洞运行的影响 |
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| 引用本文： | 朱浩,张冰冰,余亦甫.膜片非理想打开行为对自由活塞激波风洞运行的影响[J].实验流体力学,2020,34(1):55-59. |
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| 作者姓名： | 朱浩 张冰冰 余亦甫 |
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| 作者单位： | 中国航天空气动力技术研究院, 北京 100074 |
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| 摘 要： | 在自由活塞激波风洞中，主膜片非理想打开行为可能对活塞运动和激波形成产生不同程度的影响。基于膜片的剪切-应变模型和活塞动力学模型，得到了膜片打开-活塞运动的耦合方程组，完成了膜片动态打开过程对活塞运动和常压力驱动时间影响的刻画。研究显示:由于活塞前脸压力和活塞速度之间存在博弈，膜片打开行为的差异性对活塞末端速度影响不大，活塞在压缩管末端可以实现"软着陆"。此结论得到试验证实。试验结果还显示:主膜片非理想打开行为对激波形成的影响较大，但是随着激波的传播，这种影响逐渐减弱。
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| 关 键 词： | 自由活塞激波风洞 主膜片 非理想打开行为 活塞运动 激波 |
| 收稿时间： | 2019-03-01 |
Effect of non-ideal opening behavior of diaphragm on the operation of free piston shock tunnels |
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| Affiliation: | China Academy of Aerospace Aerodynamics, Beijing 100074, China |
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| Abstract: | In free piston shock tunnels, the non-ideal opening behavior of the main diaphragm may have different effects on the free piston motion and the shock wave formation. Based on the diaphragm shear-strain model and piston dynamic model, the coupled equations involving piston motion and diaphragm rupture are obtained for the first time, and the effects of the diaphragm opening process on piston motion and driving time under constant pressure are described. Research shows that, due to the interaction between the piston front pressure and the piston speed, the speed of diaphragm rupture or rupture ahead of time has little effect on the free piston terminal speed, and the piston can achieve soft landing at the end of the compression tube. This conclusion is confirmed by test results. Moreover, the test results also show that the non-ideal opening behavior of the main diaphragm has a distinct influence on the formation of the shock wave, and it gradually weakens during the propagation of the shock wave. |
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