VORTEX WAKE ROLLUP AND VORTICITY CONCENTRATION BEHIND AN AIRFOIL.
Abstract
Some experimental evidence seems to confirm that the near wake problem is basically three-dimensional and should be reexamined as such. A concentration mechanism based on this three-dimensionality is proposed and found to predict a gradient of core circulation which is dimensionally correct and gives realistic answers when specific numerical cases are compared to published experiments. The correlation of experiment with theory involves a uniform translation of the theoretical points a specific distance upstream, implying that rotational fluid in the sheet requires a finite, uniform time to get to the core, no matter which downstream station is considered. A paradox in the role of viscosity in the concentrating mechanism is discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0661070
Entities
People
- Sheila Evans Widnall
- Thomas Arthur Mcmahon
Organizations
- Massachusetts Institute of Technology