Accession Number : ADA317839

Title :   Unsteady Subsonic Aerodynamics for Maneuvering Wing/Fuselage/Pylon/Store Configuration and Store Separation Including Wake Effects.

Descriptive Note : Progress rept.,

Corporate Author : TECHNICAL UNIV OF ISTANBUL (TURKEY) FACULTY OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Kaykayoglu, C. R.

PDF Url : ADA317839

Report Date : APR 1993

Pagination or Media Count : 129

Abstract : The goal of the present investigation is to characterize the instantaneous flow field and force characteristics for a wing/fuselage/pylon/external store system during steady and unsteady flight. Emphasis is placed on practical. cost-effective engineering solution for the short-term treatment of the problem rather than an elegant mathematical modeling for the longer terms. Application of a Nonlinear Vortex Lattice Method (NVLM) Computational Fluid Dynamics (CFD) system with unsteady free wake formulation to obtaining flow field predictions about a maneuvering wing/pylon/store configuration is the primary objective of the current investigation. Separation the external store under the influence of unsteady wake roll up behind wing will be modeled by considering the full mutual interactions between the store and wing/pylon system in the second phase of the project. In this report, preliminary results were presented regarding the unsteady flow field below the wing about the external store and the unsteady aerodynamic forces on the external store before the separation during flight maneuvers. The validation of the computer modeling approach for the maneuvering wing/pylon/store combination needs experimental data. Unfortunately, the comparison experimental data were not available for the current research configuration and conditions. The experimental unsteady wing flow field and stability derivatives literature data was considered as the basis to test the accuracy and effectiveness of the computer code.

Descriptors :   *AERODYNAMIC CHARACTERISTICS, *EXTERNAL STORE SEPARATION, COMPUTER PROGRAMS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, STEADY STATE, EXPERIMENTAL DATA, COST EFFECTIVENESS, PREDICTIONS, VALIDATION, INTERACTIONS, COMPARISON, MODEL THEORY, ACCURACY, VORTICES, COMPUTATIONAL FLUID DYNAMICS, SHORT RANGE(TIME), FLOW FIELDS, NONLINEAR SYSTEMS, SOLUTIONS(GENERAL), ENGINEERING, CONFIGURATIONS, AERODYNAMIC FORCES, EXTERNAL STORES, WAKE, SUBSONIC CHARACTERISTICS, UNSTEADY FLOW, FLIGHT MANEUVERS, WINGS, STRUTS.

Subject Categories : Aerodynamics
      Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE