TY - JOUR A2 - Abdel-Maksoud, Moustafa AU - Baltazar, J. AU - Falcão de Campos, J. A. C. AU - Bosschers, J. PY - 2012 DA - 2012/06/05 TI - Open-Water Thrust and Torque Predictions of a Ducted Propeller System with a Panel Method SP - 474785 VL - 2012 AB - This paper discusses several modelling aspects that are important for the performance predictions of a ducted propulsor with a low-order Panel Method. The aspects discussed are the alignment of the wake geometry, the influence of the duct boundary layer on the wake pitch, and the influence of a transpiration velocity through the gap. The analysis is carried out for propeller Ka4-70 operating without and inside a modified duct 19A, in which the rounded trailing edge is replaced by a sharp trailing edge. Experimental data for the thrust and torque are used to validate the numerical results. The pitch of the tip vortex is found to have a strong influence on the propeller and duct loads. A good agreement with the measurements is achieved when the wake alignment is corrected for the presence of the duct boundary layer. SN - 1023-621X UR - https://doi.org/10.1155/2012/474785 DO - 10.1155/2012/474785 JF - International Journal of Rotating Machinery PB - Hindawi Publishing Corporation KW - ER -