Navier-Stokes predictions of pitch damping for axisymmetric shell using steady coning motionPrevious theoretical investigations have proposed that the side force and moment acting on a body of revolution in steady coning motion could be related to the pitch-damping force and moment. In the current research effort, this approach is applied to produce predictions of the pitch damping for axisymmetric shell. The flow fields about these projectiles undergoing steady coning motion are successfully computed using a parabolized Navier-Stokes computational approach which makes use of a rotating coordinate frame. The governing equations are modified to include the centrifugal and Coriolis force terms due to the rotating coordinate frame. From the computed flow field, the side moments due to coning motion, spinning motion, and combined spinning and coning motion are used to determine the pitch-damping coefficients. Computations are performed for two generic shell configurations, a secant-ogive-cylinder and a secant-ogive-cylinder-boattail.
Document ID
19910062537
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Weinacht, Paul (Ballistic Research Labs. Aberdeen Proving Ground, MD, United States)
Sturek, Walter B. (U.S. Army, Ballistic Research Laboratory, Aberdeen Proving Ground MD, United States)
Schiff, Lewis B. (NASA Ames Research Center Moffett Field, CA, United States)