Take-Off and Landing Critical Atmospheric Turbulence (TOLCAT) Analytical Investigation

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Report Number: AFFDL TR 68-23
Author(s): Bowne, Norman E.
Corporate Author(s): Travelers Research Center, Inc.
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1968-04
Pages: 93
Contract: F33615-67-C-1557
DoD Project: 7235
Identifier: AD0835232

A review and analysis of current knowledge of turbulence in the atmospheric boundary layer is presented. Particular emphasis is on identifying and analyzing the aspects of low altitude turbulence that have the greatest influence on the design and operation of V/STOL aircraft in the atmospheric boundary layer. The nature, quality and applicability of reported turbulence measurements is discussed, and several resulting empirical descriptions of the boundary layer are compared. Deficiencies in the data are specifically identified and discussed. The foundations, assumptions, and limitations of the statistical analyses of boundary layer turbulence which are now in use are identified and discussed. The nature of atmosphere-vehicle interactions and current and potential methods of analyzing these interactions are discussed.It was found that the most serious problem for V/STOL operations and design is the encounter of a V/STOL vehicle with large, intense individual disturbances. Some basic disturbance modes and some causal relationships are known, but few experimental studies were deisgned for the required analysis. The nature of the flow features of interest and the data required to analyze them are indicated.

Provenance: Bombardier/Aero

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