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Robust Fuel Injectors for Combustion Instability Reduction

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA8650-20-C-2302
Agency Tracking Number: F181-026-0345
Amount: $749,963.00
Phase: Phase II
Program: SBIR
Solicitation Topic Code: AF181-026
Solicitation Number: 18.1
Solicitation Year: 2018
Award Year: 2020
Award Start Date (Proposal Award Date): 2019-10-11
Award End Date (Contract End Date): 2021-10-11
Small Business Information
16 Great Hollow Road
Hanover, NH 03755
United States
DUNS: 072021041
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Darin A Knaus
 Principal Investigator
 (603) 643-3800
Business Contact
 Betsy Williams
Phone: (603) 640-2331
Research Institution

Combustion instability is an ongoing concern for military propulsion systems such as augmented gas turbine engines. Augmentor screech can limit the performance of military aircraft and can cause durability issues or even catastrophic failure if it occurs. Modern augmentors have close-coupled fueling using simple round injectors to minimize manufacturing cost. In a “jet-in-crossflowâ€Â injector, liquid fuel issues from an orifice and the penetration of the fuel jet depends on the flow rate of fuel. Screech combustion instabilities are dependent on this static flame stability and thus dependent on the penetration and atomization of the fuel jet. The prevalence of screech in the lower corner of the flight envelope is directly related to over-penetration of the fuel jets at the high fuel flow rate. Screech instabilities can be largely mitigated if a fuel injector is developed that produces a robust, largely invariant fuel distribution with good fueling of the flameholder wake. We propose to develop novel fuel injectors that are insensitive to fuel flow rate and thus engine operating condition. These injectors will more homogeneously fuel the augmentor over the flight envelope, leading to more robust combustion stability and reduced susceptibility to screech, mitigating screech before instability can initiate and grow.

* Information listed above is at the time of submission. *

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