On Fully Aligned Lifting Line Model for Propellers: An Assessment of Betz condition

The authors discuss the optimum propeller loading through the use of a lifting line model. Viscous terms are included through a drag-to-lift ratio, and a hub image model is implemented. Two types of trailing wake geometries are considered: one based on helical wakes, which are aligned at the blade (using the so-called “moderately loaded propeller” assumption), and a second one based on a full wake alignment model to represent more accurately the wake geometry and its effect on the efficiency of the propeller. A comparison of the efficiencies and the loading distributions obtained through both methods is presented as well as convergence and numerical accuracy studies. The accuracy of Betz condition according to both wake models is tested, and conclusions are drawn based on these results.

Language

  • English

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Filing Info

  • Accession Number: 01536460
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 27 2014 3:45PM