Role of Compressibility on Crossflow Separation and Vortex Asymmetry on Slender Axisymmetric Bodies at High Angles of Incidence
Abstract
Page C-1 Title: Role of Compressibility on Crossflow Separation and Vortex Asymmetry on Slender Axisymmetric Bodies at High Angles of Incidence Rajan Kumar and S. Unnikrishnan; Florida A & M University, Tallahassee, FL ARO Technical Area / Program Manager: Fluid Dynamics / Dr. Matthew Munson Smart projectiles are expected to perform maneuvers at high angles of incidence to achieve tactical advantages over a range of speed regimes including subsonic, transonic, and supersonic Mach numbers. A slender body of revolution experiences large side forces and yaw moments due to flow asymmetry created by forebody vortices at high incidence even in symmetric flight. Previous studies have significantly enhanced our fundamental understanding of vortex asymmetry on canonical axisymmetric configurations in terms of initiation, growth, and interaction of forebody vortices but were mostly limited to incompressible flow regimes. Compressibility has a direct impact on vorticity dynamics but the available literature on the effect of compressibility in terms of Mach numbers is inconclusive and contradictory. The main objective of our proposed effort is to develop a clear understanding of the role of compressibility on crossflow separation and vortex asymmetry on slender axisymmetric bodies at high angles of incidence. Intellectual Merit: The research methodology will involve a systematic experimental and computational investigation to examine the effect of compressibility on the crossflow separation and vortex asymmetry of slender bodies at high angles of incidence. We will adopt a comprehensive study that integrates high fidelity experiments, numerical simulations, and advanced data analysis methods, in a tightly integrated manner. We will examine the effect of compressibility in terms of Mach number (M = 0.2 to 5) on conical forebodies and cone/ogive cylinders at high angles of incidence and a range of Reynolds numbers to determine the onset of vortex asymmetry and the magnitude of maximum side forces. Flow field analysis will be carried out to determine the strength, spacing, and location of vortices on the body surfaces to study the cross-flow separation and shear layer roll-up process. The data-driven analysis will focus on quantifying the dominant flow features that impact the forces and moments on the slender bodies at high angles of incidence. Broader Impacts: The proposed work will result in a better understanding of vortex-dominated high-speed flows encountered in many disciplines. This integrated study will significantly leverage the established expertise of the investigators, especially in the areas of experimental aerodynamics, high-fidelity numerical simulations, and data analysis techniques, while taking advantage of the existing facilities and computational resources at FAMU-FSU College of Engineering at the Florida A&M University. Consequently, the students engaged in this research and its outcomes will come from a unique, culturally diverse population. This project will benefit the goal of producing African-American graduate degrees in engineering and supporting future faculty. The results will be broadly disseminated through presentations at professional meetings, publications in journals, and through the investigatorsÕ very active collaborations with scientists at defense research laboratories, especially those within the Army Research Laboratory.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 12, 2022
- Source ID
- W911NF2210288
Entities
People
- Kumar Rajan
Organizations
- Army Contracting Command
- Florida A&M University
- United States Army