Prediction Of Hydrodynamic And Cavitation Performance Of Ship Propeller

Propeller because of its excellent performance is the most commonly used field’sship propulsion. Development of maritime transport and military vessels thrivingmodern society, a variety of new high-performance boats and boats have emerged, theship tends to develop large-scale, high-speed. Ships continued to host high-speed andhigh-power direction, which also makes the propeller rudder cavitation-induced erosion,noise and ship propeller vibration problems have become increasingly prominent. Fluidcavitation is a complex physical phenomenon involving a phase change, the surfacetension, turbulence, etc. of non-uniform thermal effect. Cavitation can also beconsidered to be at a certain temperature due to the decrease of fluid flow phenomenacaused by the hydrodynamic pressure of the liquid phase change. Undergo cavitationbubbles occur, collapse; the process is rapid and dramatic, which cause corrosion,vibration and noise. Hydrodynamic cavitation performance and exhibition researchpaper focuses on the problem of the propeller, the main work are:We described the geometric parameters of the propeller in detail, and proposed amethod for blade section data generation. Then using NURBS curve to fit theses sectiondata, and then generates the skin from the fitted curve NURBS surface and, finally, wepresents parametric modeling methods and its basic workflow.Using a single-equation Spalart-Allmaras model and the two-equation k-εRNGmodel, k-ωSST turbulence model for three typical two-dimensional hydrofoil (NACA66mod) cavitation were calculated. The results show that SST turbulence model cansimulate the characteristics of cavitation flow more details, such as the jet can beobserved clearly back then compared the Zwart-Gerber-Belamri and Schnerr-Sauercavitation model and found that the latter has a higher accuracy and adaptability.In the simulation of two-dimensional hydrofoil cavitation flow based dynamic LESmethod, has captured the typical process of vapor cloud shedding, vacuolar the time ofshedding cycle is0.29, that close the test value of0.28, the re-entrant jet at cavityclosure area is the main trigger causing the vapor cloud shedding, while the structure ofthe vortex influence shape of vapor cloud.All wet propeller cavitation water flow and dynamic performance computing foundgood agreement between the results, indicating that the local pitch propeller cavitationdoes not affect the macroscopic hydrodynamic performance. In full and single-channel simulation, the smaller the error hydrodynamic performance with the experimentalvalues of less than8%, the error is calculated full flow channel thrust coefficient andtorque coefficient and test calculations than single passage, but single passage caseyields a more accuracy size of cavitation zone.