Sections for shrouded propeller blade

US4911612A · kind A · utility

Assignees

• OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES · FR
• Aerospatiale Societe Nationale Industrielle · FR

Inventors

• Anne-Marie Rodde · Verrières-le-Buisson, FR
• Joël Reneaux · Paris, FR
• Jean-Jacques Thibert · Verrières-le-Buisson, FR
• Alain E. Vuillet · Aix-en-Provence, FR

Key dates

• Filing date: Feb 1, 1989
• Grant date: Mar 27, 1990
• Expiry date: Feb 1, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S416/02
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

This invention relates to a section for shrouded propeller blade, of which the relative thickness is included between 9% and 15%, wherein, the curvature of said section having a maximum value at the leading edge thereof, the upper surface line comprises three successive portions, such that PA1 in the first portion, the curvature decreases rapidly from said maximum value at the leading edge to a value close to 20 at a first point of which the reduced abscissa is close to 1%; PA1 in the second portion, the curvature decreases more slowly from said value close to 20 at said first point up to a value close to 1 at a second point, of which the reduced abscissa is close to 25%; and PA1 in the third portion, the curvature is less than 1 between said second point and said trailing edge.