New dataset improves supersonic flow model around cantilever

New dataset improves supersonic flow model around cantilever

The velocity envelopes of the flow field begin entirely around a) rigid plate and b) flexible plate. Credit: Grainger College of Engineering at the University of Illinois Urbana-Champaign

The extreme pressure that accompanies high-speed flight. The resulting aerodynamic forces can present a significant risk of deforming vehicle components in motion—even to the point of aerodynamic distortion—when solids behave more like liquids. This can jeopardize the stability or controllability of the entire vehicle.

University of Illinois Urbana-Champaign researchers in the Department of Aerospace Engineering, including Griffin Bojan, with the advice of Professors Greg Elliott and J. Craig Dutton, conducted experiments to help understand get liquid/structure interactions in Flow around a transport move at high speed.

Greg Elliott says the relationship between nonlinear structure and aerodynamic response makes this an extremely difficult problem to model computationally. And although the high-speed structure-liquid interaction has been the subject of many research efforts, only a few have focused on the deformation of control surfaces.

“People have been designing and evaluating cantilever beams for a long time,” he said. “We used this classical configuration to study fluid/structure interactions starting with such a simple geometry, then adding the complexity of supersonic flow,” he said. unstable on the top of the plate and high separation flow below the plate.

Elliott said the area of ​​recirculation beneath the tectonic plate has two very complex flows that are interacting.

“Honestly, we didn’t know what that interaction would be like,” he said. “Now that we did, we hope this helps the computing community. We created a test dataset to validate their models, whether they model the configuration or the configuration. this in a complicated way or whether they have model it by simplifying the problem. This data will give computational study partners are more confident that their model is correct.”

One of the things that makes this study unique is that the data is collected simultaneously by multiple diagnostic tools. The team of researchers evaluated both rigid and flexible cantilever plates at Mach 2 conditions.

“At the same time, we took the flow data using the plate strain data and took high-speed Schlieren images using the Stereo Digital Image correlation,” said Elliott. “We knew immediately what the flow looked like and what the cantilever plate looked like. Many others have done it one way or another, but this is one of the first times these things have been temporarily addressed. measure—structural measurements with flow measurements—were taken together in this configuration.”

Another unique aspect of this study, Elliott said, is that there is a complete data set that describes the flow beneath the cantilever plate along with velocity.

“We don’t just look at a process that you pop in and it stays the same every time,” says Elliott. “This is a very unstable problem—with shock and expansion waves moving through the plate as it deforms to match the unstable flow with the surface.

“Perhaps one of the most surprising results is how three-dimensional the flow is in the sub-plate recirculation area,” he said. “Everything that sets up the problem seems two-way, but to accurately describe the flow, there are also significant changes across the entire span of the plate.”

The work is published in the magazine AIAA Magazine.

More information:
Griffin K. Bojan et al, Fluid/structural interactions of cantilever plates in ultrasonic separation flow, AIAA Magazine (2022). DOI: 10.2514/1.J061883

quote: New dataset improving supersonic flow model around a cantilever (2022, 30 Nov) retrieved 30 Nov 2022 from 11-supersonic-cantilever.html

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