Aerodynamic characteristics of an axisymmetric body undergoing a uniform pitching motion
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Authors
Smith, Lloyd H.
Nunn, Robert H.
Subjects
Aerodynamics
missile
high angle-of-attack
vortex wake
missile
high angle-of-attack
vortex wake
Advisors
Date of Issue
1975-02
Date
1975-02
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
An experimental investigation was conduct3ed to determine the effect of a uniform pitching motion on a slender axisymmetric body while undergoing large excursions in angle of attack. Force and moment measurements were obtained for a slender tangent-ogive/cylindrical body over a range of Reynolds numbers from 5 x 10 to 1.4 x 10 while varying the angle of attack from zero to 90 degrees and the pitch rate between zero and 281 degrees per second. Smoke flow visualization studies were used as an aid in assessing wake vortex transitions. The results of the investigation show that there is an increment of normal force directly attributable to the uniform pitching motion. The incremental increase in the normal force is sufficient to cause significant errors in calculating body damping derivatives from static force measurements. Distinct wake vortex transitions at approximately 20, 50, and 65 degrees were observed. The effect of a uniform pitching motion shifts the angle of attack at which these wake vortex transitions occur, and can reduce the abruptness of those transitions. (
Type
Technical Report
Description
Series/Report No
Department
Identifiers
NPS Report Number
NPS-59NN75021
Sponsors
Naval Weapons Center, China Lake, California
Funder
WR No. 2-3028
Format
NA
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.