Accession Number : ADA115317

Title :   Numerical Model For Fluid Spin-Up in A Partially-Filled Cylinder.

Descriptive Note : Interim technical rept. 1 Mar 81-28 Feb 82,

Corporate Author : CALSPAN ADVANCED TECHNOLOGY CENTER BUFFALO NY AERODYNAMIC RESEARCH DEPT

Personal Author(s) : Homicz,Gregory F

PDF Url : ADA115317

Report Date : May 1982

Pagination or Media Count : 52

Abstract : A theoretical investigation is presented for the axisymmetric spin-up of fluid in a partially-filled cylindrical cavity. It is an extension of the earlier analyses of Wedemeyer, and of Goller and Ranov, to those cases where the liquid free surface intersects one or both endwalls. The simplifying assumptions of a columnar flow and the quasi-steady treatment of the Ekman layer pumping of the secondary flow are retained. Earlier estimates of the Ekman layer pumping are modified heuristically for situations where the layer(s) no longer covers the entire wall. Also, due to the very steep free surface contour in the latter stages of spin-up, it was found advantageous to develop the free surface equations in an axial, rather than radical, coordinate frame.

Descriptors :   *Liquid filled projectiles, *Fluid dynamics, *Spinning(Motion), Spin stabilization, Axisymmetric, Cylindrical bodies, Heuristic methods, Cavities, Coupling(Interaction), Perturbations, Excitation, Angular motion, Liquid rocket propellants, Pumping, Projectile trajectories, Exterior ballistics, Contours, Equations of motion, Secondary flow

Subject Categories : Numerical Mathematics
      Ammunition and Explosives
      Ballistics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE