The purpose of this project is to investigate the effect of reverse flow on blade dynamics. During a portion of the rotor revolution in forward flight, flow can actually impinge upon the trailing edge of the blade (rather than the leading edge) giving a lift reversal. This is known to have an effect on the parametric stability of the blade. The purpose of this study is to investigate that effect for various parameters, and to study what happens if an airfoil is assumed to stall in reversed flow rather than develop negative lift. Floquet Theory is applied to time marching to obtain the characteristic exponents of the system to determine when instabilities are present.

Document Type

Final Report

Author's School

McKelvey School of Engineering

Author's Department

Mechanical Engineering and Materials Science

Class Name

Mechanical Engineering and Material Sciences Independent Study

Date of Submission


Project_Code_1.pdf (29 kB)
No Reversed Flow, B=0.98, p=0.8

Project_Code_1a.pdf (28 kB)
No Reversed Flow, B=0.98, p=1

Project_Code_1b.pdf (29 kB)
No Reversed Flow, B=0.98, p=1.2

Project_Code_1c.pdf (29 kB)
No Reversed Flow, B=1, p=0.8

Project_Code_1d.pdf (29 kB)
No Reversed Flow, B=1, p=1

Project_Code_1e.pdf (29 kB)
No Reversed Flow, B=1, p=1.2

Project_Code_2.pdf (30 kB)
Reversed Flow, B=0.98, p=0.8

Project_Code_2a.pdf (30 kB)
Reversed Flow, B=0.98, p=1

Project_Code_2b.pdf (30 kB)
Reversed Flow, B=0.98, p=1.2

Project_Code_2c.pdf (30 kB)
Reversed Flow, B=1, p=0.8

Project_Code_2d.pdf (29 kB)
Reversed Flow, B=1, p=1

Project_Code_2e.pdf (29 kB)
Reversed Flow, B=1, p=1.2

Project_Code_4.pdf (30 kB)
Reversed Flow Stalling, B=1, p=1