Accession Number:

ADA191226

Title:

Unsteady Flow about Cambered Plates

Descriptive Note:

Final rept. Oct 1986-Oct 1987

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

• Sarpkaya, T.
• Mostafa, S. I.
• Munz, P. D.

Report Date:

1987-10-01

Pagination or Media Count:

177.0

Abstract:

Impulsively-started uniform flow, decelerating at specified rates, about two-dimensional cambered plates with included angles of 120, 180, and 240 degrees has been investigated both theoretically and experimentally. The experiments were conducted in a vertical water tunnel. The forces acting on the cambered plates have determined as a function of the relative displacement of the fluid. The evolution of the vortices was visualized by means of various dyes and polystyrene beads. A numerical analysis was carried out through the use of the discrete vortex model. Vorticity is represented by a distribution of discrete line vortices. Each vortex is convected in the velocity field according to the Biot Savart law. The rollup of the vortex sheets, the distribution of velocity and pressure on the chambers, and the drag and lift forces are calculated at suitable time intervals for a prescribed time-dependent flow. The results are compared with those obtained experimentally. Keywords Unsteady flow, Discrete vortex model, Cambered plate, Parachute, Experiments, Analysis.

Descriptors:

• *PARACHUTES
• *TURBULENT BOUNDARY LAYER
• *UNSTEADY FLOW
• BEADS
• BOUNDARY LAYER
• BOUNDARY LAYER FLOW
• CAMBER
• CHAMBERS
• DISPLACEMENT
• DISTRIBUTION
• DRAG
• DYES
• EVOLUTION(GENERAL)
• FLOW
• FLOW SEPARATION
• FLOW VISUALIZATION
• MODELS
• NUMERICAL ANALYSIS
• PLATES
• POLYSTYRENE
• PRESSURE VESSELS
• STAGNATION POINT
• TIME DEPENDENCE
• TIME INTERVALS
• TWO DIMENSIONAL FLOW
• VELOCITY
• VERTICAL ORIENTATION
• VORTICES
• WATER TUNNELS

Subject Categories:

• Gliders and Parachutes
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE