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Computer studies of hybrid-slotted working sections with minimum interference at subsonic speedsA series of computations on tunnel boundary-interference effects for hybrid-slotted working sections was performed using the WALINT code. The slots were modeled as lines of porosity with linear crossflow characteristics. The basic shape evaluated was for a rectangular section with height-to-width ratio = 0.835 and its companion in the duplex mode (half model testing) with height-to-width ratio = 0.6. A best overall basic configuration was determined with seven slots on each wall with open area ratio on each wall of 17.5%. For both full-span and half-model testing, the optimum solution required closing all but two slots on each of the half-walls parallel to the plane of the wing (equivalent to four slots on the full floor and ceiling). The results are presented here for the best configurations and are shown to be within the figure-of-merit range of + or - 0.04 in upwash, and + or - 0.1 in curvature for the Mach number range 0.6 to 0.85. Blockage effects are shown to be small.
Document ID
19840024309
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Steinle, F. W., Jr. (NASA Ames Research Center Moffett Field, CA, United States)
Mabey, D. G. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
August 1, 1984
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
A-9845
NASA-TM-86002
NAS 1.15:86002
Accession Number
84N32379
Funding Number(s)
PROJECT: RTOP 505-31-51
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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