Screech Suppression via Heat Release Modification

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N68335-13-C-0324
Agency Tracking Number: N131-002-0658
Amount: $79,977.00
Phase: Phase I
Program: SBIR
Awards Year: 2013
Solicitation Year: 2013
Solicitation Topic Code: N131-002
Solicitation Number: 2013.1
Small Business Information
Creare Inc.
P.O. Box 71, Hanover, NH, -
DUNS: 072021041
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Darin Knaus
 Principal Investigator
 (603) 643-3800
 dak@creare.com
Business Contact
 Robert Kline-Schoder
Title: President
Phone: (603) 643-3800
Email: contractsmgr@creare.com
Research Institution
N/A
Abstract
Combustion stability is critical to the performance of augmented military jet engines. Instabilities such as screech can result in reduced augmentor performance, increased sustainment requirements, or even catastrophic failure. Screech remains a difficult problem to predict and mitigate, and its occurrence can limit the operational flight envelope of military systems. Many of the passive techniques used to suppress combustion instabilities in stationary gas turbines are unsuitable for military propulsion systems. Advanced active control techniques involving high-bandwidth active cancellation of instabilities have not been applied to real systems due to their inherent complexity. In this research program, we propose to apply an advanced fueling system for low-bandwidth, active screech suppression. The fueling system, called CFIS (Carbureted Fuel Injection Scheme), provides control of the spatial distribution of heat release, allowing for manipulation of symmetry and convective time delays in the augmentor without structural modifications. In the proposed research program, we will apply CFIS fueling to a high-fidelity augmentor rig designed to generate screech instabilities that are relevant to modern engine designs (transverse instabilities). We will then apply and investigate strategies for mitigating screech by manipulating the heat release distribution using CFIS injectors.

* information listed above is at the time of submission.

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