Two-equation low-Reynolds-number turbulence modeling of transitional boundary layer flows characteristic of gas turbine blades. Ph. D. Thesis. Final Contractor Report

Technical Report · Sun May 01 00:00:00 EDT 1988

OSTI ID:7142803

Schmidt, R C; Patankar, S V

The use of low Reynolds number (LRN) forms of the k-epsilon turbulence model in predicting transitional boundary layer flow characteristic of gas turbine blades is developed. The research presented consists of: (1) an evaluation of two existing models; (2) the development of a modification to current LRN models; and (3) the extensive testing of the proposed model against experimental data. The prediction characteristics and capabilities of the Jones-Launder (1972) and Lam-Bremhorst (1981) LRN k-epsilon models are evaluated with respect to the prediction of transition on flat plates. Next, the mechanism by which the models simulate transition is considered and the need for additional constraints is discussed. Finally, the transition predictions of a new model are compared with a wide range of different experiments, including transitional flows with free-stream turbulence under conditions of flat plate constant velocity, flat plate constant acceleration, flat plate but strongly variable acceleration, and flow around turbine blade test cascades. In general, calculational procedure yields good agreement with most of the experiments.

• Research Organization: Minnesota Univ., Minneapolis (USA)
• OSTI ID: 7142803
• Report Number(s): N-88-23185; NASA-CR-4145; E-3960; NAS-1.26:4145
• Resource Relation: Other Information: Ph.D. Thesis. Final Contractor Report
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
GAS FLOW
MATHEMATICAL MODELS
TRANSITION FLOW
TURBINE BLADES
TURBULENT FLOW
BOUNDARY LAYERS
GAS TURBINES
PROGRESS REPORT
THEORETICAL DATA
DATA
DOCUMENT TYPES
FLUID FLOW
INFORMATION
LAYERS
MACHINERY
NUMERICAL DATA
TURBINES
TURBOMACHINERY
420400* - Engineering- Heat Transfer & Fluid Flow