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MAVRIC Flutter Model Transonic Limit Cycle Oscillation Test

机译:MAVRIC Flutter模型跨音速极限循环振荡测试

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摘要

The Models for Aeroelastic Validation Research Involving Computation semi-span wind-tunnel model (MAVRIC-I), a business jet wing-fuselage flutter model, was tested in NASA Langley's Transonic Dynamics Tunnel with the goal of obtaining experimental data suitable for Computational Aeroelasticity code validation at transonic separation onset conditions. This research model is notable for its inexpensive construction and instrumentation installation procedures. Unsteady pressures and wing responses were obtained for three wingtip configurations of clean, tipstore, and winglet. Traditional flutter boundaries were measured over the range of M = 0.6 to 0.9 and maps of Limit Cycle Oscillation (LCO) behavior were made in the range of M = 0.85 to 0.95. Effects of dynamic pressure and angle-of-attack were measured. Testing in both R134a heavy gas and air provided unique data on Reynolds number, transition effects, and the effect of speed of sound on LCO behavior. The data set provides excellent code validation test cases for the important class of flow conditions involving shock-induced transonic flow separation onset at low wing angles, including LCO behavior.
机译:涉及计算半跨风洞模型(MAVRIC-I)的航空弹性验证研究模型,是在美国国家航空航天局Langley的跨音速动力学隧道中进行测试的,目的是获得适合计算航空弹性代码的实验数据在跨音速分离开始条件下进行验证。该研究模型以其廉价的构造和仪器安装程序而著称。对于干净的,翼尖存储的和小翼的三种翼尖配置,获得了非稳态压力和机翼响应。在M = 0.6至0.9的范围内测量了传统的颤动边界,并在M = 0.85至0.95的范围内绘制了极限循环振荡(LCO)行为图。测量了动压和攻角的影响。在R134a重气体和空气中进行的测试提供了有关雷诺数,过渡效应以及声速对LCO行为影响的独特数据。该数据集为重要的流动条件类别提供了出色的代码验证测试用例,这些条件涉及在低机翼角度(包括LCO行为)引起的激振引起的跨音速流动分离。

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