Abstract
Under the condition of large water immersion, surface-piercing propellers are inclined to be heavy loaded. In order to improve the hydrodynamic performance of the surface-piercing propeller, the installation of a vent pipe in front of a propeller disc is more widely used in the propulsion device of high speed planning crafts. Based on computational fluid dynamics (CFD) method, this paper studied the influence of diverse vent pipe diameters on hydrodynamic performance of the surface-piercing propeller under full water immersion conditions. The numerical results show that, with the increase of vent pipe diameters, the thrust and torque of the surface-piercing propeller decrease after ventilation, and the efficiency of the propeller increases rapidly; the low pressure area near the back root of the blade becomes smaller and smaller gradually; and the peak of periodic vibration of thrust and torque can be effectively reduced. The numerical results demonstrate that the installation of artificial vent pipe effectively improves the hydrodynamic performance of surface piercing propeller in the field of high speed crafts, and the increase of artificial vent pipe diameter plays an active role in the propulsion efficiency of the surface-piercing propeller.
Highlights
Surface-piercing propellers (SPPs) are defined as a propeller that normally operates with some parts of blades above water and the remaining parts are submerged in water
A summary of the advantages for the high performance of the surface-piercing propeller relative to conventional installations follows [1]. (1) Propeller efficiency: surface-piecing propeller frees the designers form the limitations by the size of the propeller that will be operated
An Finite Volume Method (FVM) numerical simulation method of the three-blade paddle by equipping a vent pipe in front of the propeller disc was performed based on the Star-CCM+ software (9.06 version, Group: Melville, New York, USA) [22]
Summary
Surface-piercing propellers (SPPs) are defined as a propeller that normally operates with some parts of blades above water and the remaining parts are submerged in water. Yang et al [3] simulated the surface piercing propeller with artificial ventilated pipe in front of the propeller disc It proved that the SPPs with vent pipes were more efficient than that without a pipe under the fully immersed condition. A surface-piercing propeller with an artificial ventilation is an attractive subject to demonstrate the difference between the conventional SPPs. In this paper, an Finite Volume Method (FVM) numerical simulation method of the three-blade paddle by equipping a vent pipe in front of the propeller disc was performed based on the Star-CCM+ software (9.06 version, Group: Melville, New York, USA) [22]. The ventilation pipes with different diameters were installed in front of the propeller disc
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