Accession Number:

ADA002671

Title:

Effect of Wake on the Performance and Stability Characteristics of Advanced Rotor Systems

Descriptive Note:

Final rept.

Corporate Author:

ROCHESTER APPLIED SCIENCE ASSOCIATES NY

Personal Author(s):

• Shipman, Keith W.

Report Date:

1974-09-01

Pagination or Media Count:

164.0

Abstract:

The performance parameters and stability and control drivatives for various rotor systems are considered using the wake-induced velocity distributions to compute the loading and responses of the rotor blades. The geometry of a self-deformed wake is used to compute influence coefficients which, when multiplied by the blade circulation loading, provide the distribution of the wake-induced velocities. The blades loading and response are coupled together and iterations are carried out in the blade loads and response program until the two are compatible. Interactions of the wake with the airframe are not considered, and the flight conditions are limited to steady forward flight.

Descriptors:

• *WAKE
• *HELICOPTERS
• *HELICOPTER ROTORS
• AERODYNAMIC LOADING
• FLOW FIELDS
• COMPUTER PROGRAMMING
• MATHEMATICAL MODELS
• VORTEX SHEDDING

Subject Categories:

• Aerodynamics
• Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE