Evaluation of a Pneumatic Valving System for Application to a Circulation Control Rotor
Abstract
A cam-type pneumatic valving system has been developed to provide helicopter rotor control/trim forces. This valving system provides both first and second harmonic rotor control by means of modulating both blade pressures and mass flow rates. Data are presented for (1) constant, one-per-rev, and two- per-rev air modulation, (2) constant and tapered slot distributions, (3) two pipe volumes, and (4) three cam-nozzle gap distances. The present study demonstrated that air pressure and mass flow rate can be modulated by means of a simple cam valve system. As the gap between the periphery of the cams and the nozzle was increased for a given cam geometry, the mean pressure and mass flow rate increased and the peak-to-peak pressure and mass flow rate decreased. It was also demonstrated that a smooth transfer of the total pressure and mass flow rate occurred in going from a one- to a two-per-rev component (or vice versa).
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1973
- Accession Number
- AD0910982
Entities
People
- Kenneth R. Reader