Restricted Research - Award List, Note/Discussion Page

Fiscal Year: 2018

1998  The University of Texas at San Antonio  (75816)

Principal Investigator: Maldonado, Victor (Principal Investigator)  

Total Amount of Contract, Award, or Gift (Annual before 2011): $ 500,000

Exceeds $250,000 (Is it flagged?): Yes

Start and End Dates: 2/1/18 - 1/31/23

Restricted Research: YES


Department, Center, School, or Institute: COE MECHANICAL ENGINEERING  

Title of Contract, Award, or Gift: CAREER: Control of Vortex Breakdown in High-Reynolds Number Rotor Flows with Secondary Vortex Structures

Name of Granting or Contracting Agency/Entity: Natl Science Fdn

Program Title: N/A
CFDA Linked: Engineering Grants


The interaction and evolution of primary flow structures targeted with active flow control techniques in high Reynolds number rotor flows to improve performance remains a challenging and misunderstood problem in fluid dynamics. Vortex shedding is responsable for phenomena leading to increased noise and vibration in rotor systems. A considerable effort has been made to understand the nature and flow physics of vortex structures, suggesting that they are composed of three regions of distinct flow; fully laminar at the core, transitional in the middle including eddies of many sizes, and fully turbulent in the outer region. The main goal of this project is to elucidate the flow physics of the interaction and near-field evolution of high Reynolds number vortex (primary) structures when targeted with synthetic jets and wall oscillation-induced vortex (secondary) structures of various length scales. One of the goals of the research is to test the theory that secondary vortices, when introduced at the correct length scales and dimensionless parameters, can penetrate and break-down primary vortex structures given their multi-scale nature. The projects consists of the following objectives to: (1) Acquire stereo particle image velocimetry (SPIV) measurements with separate synthetic jets and wall oscillations at three locations on the blade; near the root, at the middle, and at the tip of the blade at different operating conditions. (2) Identify the vortex scales with the λ-2-criterion and the Γ-criterion and characterize the flow in terms of the proper orthogonal decomposition (POD) modes representing the energy content of the flow structures. (3) Reconstruct the velocity and vorticity fields as a three-dimensional volumetric element using data from a series of measurement planes at each measurement domain. The expected significance of the research is a framework for understanding multi-scale vortex interaction at high Reynolds and Mach numbers and the effective targeting of secondary structures for vortex breakdown and improvement of rotor performance.

Discussion: No discussion notes


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