The paper investigates the flow through a uniformly-loaded propeller by means of a free-wake ring-vortex actuator disk without wake rotation. In particular, the model represents the near wake by the superposition of N ring vortices, while the far wake is modelled by a semi-infinite vortex cylinder with uniform radius. This second part presents the iterative solution procedure of the method illustrated in the companion paper as well as the implementation of the wake boundary conditions. Then, the power coefficient, the ideal propulsive efficiency and the wake contraction ratio are presented as a function of the propeller thrust coefficient, thus revealing the relevance of the wake convergence effects. Finally, the method is used to investigate the main characteristics of the local flow field induced by such an actuator disk.
A ring-vortex free-wake model for uniformly loaded propellers. Part II - Solution procedure and analysis of the results / Bontempo, Rodolfo; Manna, Marcello. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 148:(2018), pp. 368-375. (Intervento presentato al convegno 73rd Conference of the Italian Thermal Machines Engineering Association, ATI 2018 tenutosi a Pisa, Italia nel 2018) [10.1016/j.egypro.2018.08.007].
A ring-vortex free-wake model for uniformly loaded propellers. Part II - Solution procedure and analysis of the results
Bontempo, Rodolfo
;Manna, Marcello
2018
Abstract
The paper investigates the flow through a uniformly-loaded propeller by means of a free-wake ring-vortex actuator disk without wake rotation. In particular, the model represents the near wake by the superposition of N ring vortices, while the far wake is modelled by a semi-infinite vortex cylinder with uniform radius. This second part presents the iterative solution procedure of the method illustrated in the companion paper as well as the implementation of the wake boundary conditions. Then, the power coefficient, the ideal propulsive efficiency and the wake contraction ratio are presented as a function of the propeller thrust coefficient, thus revealing the relevance of the wake convergence effects. Finally, the method is used to investigate the main characteristics of the local flow field induced by such an actuator disk.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
