Effects of the shroud on aerodynamic performance in helicopter shrouded tail rotor system Available to Purchase

Gives a momentum theory analysis to analyze the effects of the shroud on aerodynamic performance in a helicopter shrouded tail rotor system for hover and side wind states. As the key to the analysis, introduces a thrust distribution factor to represent the ratio of the shroud thrust to the total thrust of the shrouded rotor. With the help of the factor, fully derives the relations of the thrust, power and disk area for a shrouded rotor. Discusses the effects of the airflow velocity on the thrust gains of the shroud. Makes comparisons between a shrouded rotor and an isolated rotor for different cases and analyzes the variations of the thrust and power of a shrouded rotor with the thrust distribution factor. Gives several conclusions.