A Multi-Objective Approach for Determining the Number of Blades on a Naca Marine Propeller

Nouri, Nowrouz Mohammad; Mohammadi, Sara

doi:10.21278/brd67202

Cited by 3 publications

(4 citation statements)

References 7 publications

(10 reference statements)

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“…The more the number of blades, the greater the aerodynamic interference between the blades. In this paper, the commonly used double blade propeller is selected (Mohammad and Saber, 2016; Bakhtiari and Ghassemi, 2020).…”

Section: Propeller Designmentioning

confidence: 99%

Design and aerodynamic characteristics analysis of propellers for a novel rescue unmanned aerial vehicle

Guan,

2023

AEAT

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Purpose To solve the shortcomings of existed search and rescue drones, search and rescue the trapped people trapped in earthquake ruins, underwater and avalanches quickly and accurately, this paper aims to propose a four-axis eight-rotor rescue unmanned aerial vehicle (UAV) which can carry a radar life detector. As the design of propeller is the key to the design of UAV, this paper mainly designs the propeller of the UAV at the present stage. Design/methodology/approach Based on the actual working conditions of UAVs, this paper preliminarily estimated the load of UAVs and the diameters of propellers and designed the main parameters of propellers according to the leaf element theory and momentum theory. Based on the low Reynolds number airfoil, this paper selected the airfoil with high lift drag ratio from the commonly used low Reynolds number airfoils. The chord length and twist angle of propeller blades were calculated according to the Wilson method and the maximum wind energy utilization coefficient and were optimized by the Asymptotic exponential function. The aerodynamic characteristics of the designed single propeller and coaxial propeller under different installation pitch angles and different installation distances were analyzed. Findings The results showed that the design of coaxial twin propellers can increase the load capacity by about 1.5 times without increasing the propeller diameter. When the installation distance between the two propellers was 8 cm and the tilt angle was 15° counterclockwise, the aerodynamic characteristics of the coaxial propeller were optimal. Originality/value The novelty of this work came from the conceptual design of the new rescue UAV and its numerical optimization using the Wilson method combined with the maximum wind energy utilization factor and the exponential function. The aerodynamic characteristics of the common shaft propeller were analyzed under different mounting angles and different mounting distances.

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Section: Propeller Designmentioning

confidence: 99%

Design and aerodynamic characteristics analysis of propellers for a novel rescue unmanned aerial vehicle

Guan,

2023

AEAT

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“…Choosing the correct marine propeller is a vital design step to achieve the required performance, as the marine propeller is the principal ship component to provide the necessary propulsion [1]. The geometry of a marine propeller is very complicated because of the numerous geometrical parameters involved, such as the number of blades, skew angle, diameter, pitch ratio, and camber and thickness distributions [2]. The designer must adjust these parameters so that the propeller produces the required thrust and has the minimum possibility of cavitation occurring, acceptable efficiency, Technical Editor: André Cavalieri.…”

Section: Introductionmentioning

confidence: 99%

“…low vibration, and high structural lifetime. Each parameter has specific effects on the designer's objectives and must be carefully adjusted [2]. Over the past decades, computational tools have been extensively used in marine propeller design and analysis [3].…”

Section: Introductionmentioning

confidence: 99%

“…The developments which have occurred in computational resources have made researchers use numerical methods in order to accurately analyze the flow fields around complicated devices. Therefore, the hydrodynamics researchers have been interested in simulating the flow around the propellers by means of RANS-based Computational Fluid Dynamics (CFD) methods for the last decade [2]. Several research projects have been performed on marine propellers in open water or wake conditions using numerical methods [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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A CFD study on the correlation between the skew angle and blade number of hydrodynamic performance of a submarine propeller

Malmir

2019

J Braz. Soc. Mech. Sci. Eng.

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In the present study, the correlation between skew angle and blade number on the hydrodynamic performance of a submarine propeller is numerically investigated using computational fluid dynamics. For this purpose, three different blade numbers (3, 5 and 7 blades) and four different skew angles which vary from 0° to 52° are considered based on the INSEAN E1619 propeller model as the main geometry. Three-dimensional numerical simulation is based on Unsteady Reynolds-Averaged Navier-Stokes equations combined with SST k-ω turbulence model. The hydrodynamic coefficients and efficiency are compared against the experimental and numerical results at various advance coefficients (J), and good agreement is achieved. Based on the results, by increasing the blade number, hydrodynamic coefficients are improved. The interaction between 7 blades dissipates the negative wake region in locations near the propeller blades which leads to produce higher hydrodynamic efficiency compared to other propellers. The maximum torque coefficient is generated by the propeller with 7 blades which is enhanced by about 11.8% compared to the propeller with 3 blades at J = 0.88. In addition, lower skew angle gives slightly higher performance than the high skew angle propeller. In overall, hydrodynamic efficiency of the propeller with a skew angle equal to 0° is enhanced by about 19.4% compared to the propeller with skew angles equal to 52° at J = 0.88. Keywords Propeller • Skew angle • Blade number • Hydrodynamic • Computational fluid dynamics (CFD) List of symbols INSEAN Italian ship model basin DTMB David Taylor model basin MRF Moving reference frame K Q Torque coefficient K T Thrust coefficient Y + Dimensionless wall distance ρ Fluid density (kg/m 3) V a Advance velocity (m/s) δ ij Kronecker delta D Diameter (mm) c Chord length (mm) η 0 Hydrodynamic efficiency J Advance coefficient u Velocity (m/s) μ Viscosity (kg/m s)

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Optimizing the bearing vertical offset of a marine propeller shaft system

Bsiso,

Ripin

2024

Proceedings of the Institution of Mechanical Engineers, Part M:

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The Vertical bearing offset is vital for the safe and efficient operation of marine shafting systems. The bearing offset is made relative to the shaft and must be tested for various operational conditions to prevent overheating, whipping, vibration, and wear that can lead to costly repairs and downtime. The offset of each bearing is achieved by minute adjustment of the bearing pedestal performed during dry-docking. However, the hull load variation can cause the preset bearing offsets to be inadequate resulting in potential bearing damage. Classification Society of ABS and DNV specifies the limit of bearing reaction force, shaft slope, and bending moment to ensure safe operation. These values are usually determined using a finite element model or experimentally using costly strain gauges. A more cost-effective solution is using the stiffness matrix of the bearing shaft system to derive the influence coefficients for the bearing reaction forces (BIC), shaft slope (SIC), and bending moment (MIC). This approach is validated with the existing model of a marine shafting system of a 50 DWT oil tanker that consists of one tail and intermediate shaft supported by stern tube bearing (STB), and intermediate bearing (IB) respectively along with six bearings at the engine shaft using the finite element method. Besides, the study applies the Multi-Objective Particle Swarm Optimization (MOPSO) technique to optimize the vertical position of bearings. It uses BIC, Slope SIC, and MIC to construct the objective functions and find a Pareto-optimal solution that satisfies the requirements of ABS and DNV in terms of bearing reaction forces, bending moments, and slope at the main stern tube and intermediate bearing. The optimal bearing offsets show improved shaft bending state for the operating condition under evaluation and reduced the slope at the STB by 34%, indicating its effectiveness in solving optimization problems.

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A Multi-Objective Approach for Determining the Number of Blades on a Naca Marine Propeller

Cited by 3 publications

References 7 publications

Design and aerodynamic characteristics analysis of propellers for a novel rescue unmanned aerial vehicle

Design and aerodynamic characteristics analysis of propellers for a novel rescue unmanned aerial vehicle

A CFD study on the correlation between the skew angle and blade number of hydrodynamic performance of a submarine propeller

Optimizing the bearing vertical offset of a marine propeller shaft system

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