Predicting the Onset of Turbulence in the Presence of a Pressure Gradient.

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Abstract:

An analytical study is presented regarding the determination of a pressure gradient dependent criterion for flow transition from laminar to turbulent flow. The results obtained were derived from two parallel approaches to flow stability one of wave-dependent stability and the other of vorticity-dependent stability. In both cases, one of a variable transition Reynolds number dependent upon the ambient pressure gradient and the other one of a constant transition Reynolds number bases on the boundary-layer displacement thickness, the prediction results were either as good or better than those from available prediction methods. In addition these two criteria were used to predict transition locations on a NACA 0018 airfoil, again with favorable results. Author

Author(s):
Charles, R. D.
Author Organization(s):
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
Descriptive Note:
Master's thesis,
Pagination:
0074

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFIT/GAE/AA/83D-4
 Subject Terms
Joint Capability Areas:
JCA_1_Force Support; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_5_Command and Control; JCA_5.3_Planning; JCA_4.6_Engineering; JCA_1.2_Force Preparation; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_1.2.3_Educating; JCA_6.1_Information Transport; JCA_6_Net Centric
Modernization Areas:
Fully Networked C3
Communities of Interest:
C4I
Descriptor(s):
*Boundary layer transition, *Pressure gradients, *Turbulent flow, Mathematical prediction, Laminar flow, Stability, Vortices, Reynolds number, Variables, Constants, Boundary layer, Displacement, Thickness, Momentum, Interactions, Boundary layer flow, Adverse conditions, Position(Location), Airfoils, Theses
Field(s)/Group(s):
Fluid Mechanics
Keyword(s):
Ambient pressure gradients, Turbulence onset, Orr Sommerfield equation, Flow stability
Report Date:
1983 Dec 01