Laminar airflow and sub-sonic shock wave VISIBLE on a wing in flight!
Автор: Robert Bremmer
Загружено: 2019-08-29
Просмотров: 3817
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We were at cruise in a 757 over the Pacific enroute to Hawaii. I look out and see this weird meandering vortex, floating about a quarter inch above the wing, from root to tip. The GOOD STUFF starts at about :50 seconds in. Sorry I didn't hold camera steadier! As I watch, it jumps with each jolt of turbulence. My theory - the moisture content and temperature of the air and the sun angle with resultant shadow effect, is what made this phenomenon visible. I've never seen it before or after. Has anyone else seen this effect? I think it shows where the laminar flow starts trying to separate from the wing. It looks like a little mini rapidly rotating contrail/tornado, ranging from about an eighth to a little more than a quarter inch in diameter, and i moves like a fluid stream. It also jumps with the shockwave, which you can see as a think shadow line and bright line, forward of the rotating vortex.
One of the viewers described it as a Tollmien-Schlichting wave causing a spanwise laminar separation bubble. Does anyone think otherwise? Leave a comment.
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