Investigation of the Effects of Geometrical Characteristics of the Spray Rail on Hydrodynamic Components and Floating Resistance in Calm Waters

The wet surface caused by water spray is one of the factors of creating resistance in highspeed floats.On this basis, the effect of the sprayer appendage in reducing the buoyancy resistance has been investigated and the effect of its geometric characteristics, including the bottom angle, width and number of spray rails, on the hydrodynamic components and the buoyancy resistance has been investigated using a numerical method.The results of numerical simulations have been validated with similar laboratory data for the float without appendages.Taguchi's method has proposed 18 test designs, that each test design is simulated in two general positions of spray rails (in line with the chine and parallel to the keel) for the transverse landing number of 1.99 and 3.33.The results show that the two geometric characteristics of the bottom angle and the number of sprays have a direct relationship with Keywords: Floating Resistance Spray rail Hydrodynamic components Longitudinal stability Porpoising ‫همکاران‬ ‫و‬ ‫نجفی‬ ‫امین‬ / ‫پاییز‬