From: firstname.lastname@example.org (R. & L. Chilukuri) Organization: Univ of California at San Diego Date: 14 Mar 95 02:34:34
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One of the many Aero problems associated with the use of thrust reversers (T/R) is associated with the plume trajectory. Integration of a T/R with an aircraft is a painful process, especially for fuselage-mounted engines. During landing, the T/R plume washes over control surfaces and can cause severe rudder buffetting, pitch-up moment and tail rocking. Many of the empirical models that are available in the open literature, were developed using laboratory measurements of plume trajectory and spreading. These lab experiments were almost always performed for a simple configuration of a jet issuing from a flat plate into a cross-stream, with a flat (top hat) initial velocity distribution. The flow within a thrust reverser geometry forces fluid to undergo nearly 135 deg turn, before issuing out as a plume. Thus the starting velocity profile will be extremely skewed, and perhaps will contain counter-rotating vortices. Does data exist on the effect of the initial velocity profile on plume trajectory and decay? How does one model (other than CFD) these flow fields? Thanks a bunch-- Krish Chilukuri Aero Group Leader Rohr Inc.