Mechanism Based Jet Noise Mitigation Using Computations, Modeling and Experiments
Abstract
The purpose of this action is to provide FY24 CR5 funding, in the amount of $240K, for a new start Grant. GRANT#14064757.--Mitigation of supersonic jet noise is critically important for propulsion systems of military aircraft and for future supersonic civilian aircraft. Significant progress has been made in computational modeling of supersonic jets, including prediction of resonant tones (screech) and broadband shock-associated and turbulent mixing noise components. In this proposed three year project we outline the next steps in using computational modeling along with laboratory experiments (to be performed by our research partners) to address supersonic jet noise mitigation, directed at mitigating both the tonal and broadband components of radiated noise for rectangular nozzles, and for mitigating the coupling between twin supersonic jets which is known to increase the intensity of tonal noise and cause structural fatigue. The proposed research will begin with exploration of the design space for noise mitigation based on passive geometric modifications, and limited secondary fluid injection inside the nozzle. In coordination with complementary experiments the design space will be narrowed and specific concepts selected for high-resolution detailed simulations. Data from low- and high-resolution simulations and theoretical modeling of noise mitigation mechanisms will be incorporated in development of reduced order models for the underlying phenomena. This document is approved for public release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 13, 2024
- Source ID
- N000142412378
Entities
People
- Sanjiva K. Lele
Organizations
- Office of Naval Research
- Stanford University
- United States Navy