Approved for public release; distribution unlimited. Prepared for r EUSTIS DIRECTORATE U. S. ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LABORATORY __Fort Eustis, Va. 23604 cm, all EUSTIS DIRECTORATE POSITION STATEMENT This report provides detailed insight into a specific R&D problem experienced during the Dynamic System Test Rig (DSTR) phase of the HLH program. A discussion of the evolution of the problem, details of the subsequent design investigation, and the resulting solution are presented. Results of this contract are being integrated with other R&D problem identification efforts at the Eustis Directorate to establish research and development programs to improve engine/drive train/airframe dynamic interface characteristics of future Army aircraft systems. Mr. Allen C. Royal, Propulsion Technical Area, Technology Applications Divis' served as Project Engineer for this effort.
The modeling and simulation of the Beer-Lambert law is developed and presented for laser absorption along an arbitrary, straight optical path in which conditions along the optical path are nonhomogeneous due to a reacting flow environment. This capability is demonstrated using a low-speed reacting flow example with heterogeneous carbon surface chemistry. Motivated by existing experimental work, the effects of variations in laser angle, offset from the reacting sample, catalycity parameters, and pressure are investigated. It is shown that variations in parameters of the catalycity model induce the greatest change in laser absorption. From these results, it is concluded that the use of modeling and simulation together with experimentally obtained laser absorption data to drive the solution of inverse problems for surface catalycity is feasible.
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