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Meeting	ACGS Committee Meeting 111 - Reno, Nevada - March 2013
Agenda Location	7 SUBCOMMITTEE E – FLIGHT, PROPULSION, AND AUTONOMOUS VEHICLE CONTROL 7.4 A Systems Level Perspective on Engine Ice Accretion
Title	A Systems Level Perspective on Engine Ice Accretion
Presenter	Ryan May
Affiliation	Vantage Partners LLC, NASA GRC
Available Downloads*	presentation
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Abstract	A Systems-Level Perspective on Engine Ice Accretion Ryan D. May, Vantage Partners, LLC Ten-Huei Guo, Donald L. Simon, NASA Glenn Research Center Presented to the ACGSC, Reno, NV, March 6-9, 2013 Abstract The accretion of ice particles in the core of commercial aircraft engines has been an ongoing aviation safety challenge. While no accidents have resulted from this phenomenon to date, numerous engine power loss events ranging from uneventful recoveries to forced landings have been recorded. The majority of the work in response to this aviation safety concern has focused on understanding the mechanism by which particles in high ice-water content (HIWC) conditions can accrete on compressor stator blades, understanding the environmental conditions in which accretion can occur, and related regulatory guidance. While avoidance of HIWC conditions and compressor redesigns are the ideal long-term solutions, it is important to provide some mechanism for existing aircraft to safely operate in these conditions if they are encountered. Our work takes an engine system level perspective on the problem. Initial work has developed the capability to simulate the impact of engine ice blockages using altered compressor maps in the Commercial Modular Aero-Propulsion System Simulation 40k (C MAPSS40k). Using this capability, rollback was simulated and it was shown that the engine control system’s limit protection is the proximate cause of iced engine rollback. Algorithms have then been developed and tested that enable the detection of the buildup of ice particles in the compressor section using only the existing engine sensor suite. Ongoing work focuses on improving the detection algorithms, investigating mitigation and prevention strategies, and validating results using upcoming engine tests.