# Accession Number:

## AD0491984

# Title:

## A STUDY OF THE MINIMUM PRESSURE IN A TRAILING VORTEX SYSTEM

# Descriptive Note:

## Doctoral thesis

# Corporate Author:

## PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF AERONAUTICAL ENGINEERING

# Personal Author(s):

# Report Date:

## 1954-06-01

# Pagination or Media Count:

## 155.0

# Abstract:

Theoretical, experimental, and semi-empirical investigations of the minimum pressure in trailing vortex systems of elliptic, rectangular, and delta wings are presented. The magnitude of the minimum pressure coefficient in the trailing vortex system of a wing increases nearly linearly with the angle of attack of the wings. This magnitude is almost independent of aspect ratio for elliptic wings but for rectangular wings is slightly higher, the greater the aspect ratio, for a given angle of attack. At a given angle of attack the magnitude of the minimum pressure coefficient increases with increasing Reynolds number. The thickness of the tip-vortex core, or the thickness of the edge of the trailing vortex sheet is determined by the thickness of the boundary layer on the lower surface of the wing at the trailing edge of the tip and not be any considerations of induced drag and kinetic energy of the vortex sheet itself.

# Descriptors:

- *TRAILING VORTICES
- *INCOMPRESSIBLE FLOW
- *CAVITATION
- THICKNESS
- EXPERIMENTAL DATA
- PERFORMANCE(ENGINEERING)
- MATHEMATICAL PREDICTION
- MATHEMATICAL ANALYSIS
- WAKE
- WINGS
- DELTA WINGS
- VARYING SWEEP WINGS
- HYDROFOILS
- TRAILING EDGES
- ASPECT RATIO
- MARINE PROPELLERS
- HYDRAULIC MODELS
- REYNOLDS NUMBER
- FLOW SEPARATION
- EQUATIONS
- PRESSURE
- MODEL TESTS
- BOUNDARY LAYER
- VORTICES
- ANGLE OF ATTACK

# Subject Categories:

- Fluid Mechanics
- Aerodynamics