Propeller Efficiency Enhancement by the Blade's Tip Reformation

Maghareh, Meysam; Ghassemi, Hassan

doi:10.12691/ajme-5-3-1

Cited by 9 publications

(7 citation statements)

References 4 publications

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“…where P is the static pressure, g i is the gravitational acceleration, F i is the external body force in an averaged Cartesian component of the velocity-vector in ith direction (i = 1, 2, 3) and ij is the Kroneker delta, which is equal to unity i = j and zero when i ≠ j [20].…”

Section: Mass Conservation Equationmentioning

confidence: 99%

“…Corresponding to the physical conservation laws above, the finite volume cell-centred discretization model for structure meshes is applied as a volume integral formulation with a finite partitioning set of volumes to discretize the equations; and is expressed in Eqs. 3and (4) [21]. Meanwhilst, the current numerical solution approach is solved using Runge-Kutta method of time discretization, dU∕dT = F(U).…”

Section: Numerical Schemementioning

confidence: 99%

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Computational analysis on B-series propeller performance in open water

Adam

Fitriadhy

Quah³

et al. 2020

Mar Syst Ocean Technol

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This paper presents a computational fluid dynamics (CFD) simulation to predict thrust coefficient (K T), torque coefficient (K Q) and efficiency () in open-water condition, whilst a hydrodynamic description around the propeller's blade underlying the rationale behind the results is explained. The effects of propeller revolution (RPM) and number of blades (Z) on the type of B-series have been appropriately taken into account within the range of advance ratio 0.1≤J≤1.0. The preliminary CFD results for the values of K T , K Q and showed a good agreement with the open-water test results, in which the percentage of the average discrepancy error is adequately acceptable. In general, the results revealed that the increase of advance ratio was proportional with the values of K T , K Q and. Inversely, the propeller's efficiency decreases particularly at J > 0.8. Regardless of the propeller's RPM, the propeller with Z = 3 provides the highest efficiency. The current CFD result is very useful for acquiring an insight related to the fundamental understanding of the propeller properties in open-water condition.

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Section: Mass Conservation Equationmentioning

confidence: 99%

Section: Numerical Schemementioning

confidence: 99%

Computational analysis on B-series propeller performance in open water

Adam

Fitriadhy

Quah³

et al. 2020

Mar Syst Ocean Technol

View full text Add to dashboard Cite

show abstract

“…where p = static pressure, = gravitational acceleration, = external body force in an averaged Cartesian component of the velocity-vector in i th direction (i=1,2,3) and ij  = Kroneker delta and is equal to unity i = j and zero when ≠ j [12]. Finally, defined Reynolds-stress tensor presented below as Eq.…”

Section: Governing Equationmentioning

confidence: 99%

“…This experimental method is very expensive, time-consuming, and have a complex procedure for various hydrodynamics analysis test configuration. Following the works of [12][13][14][15][16], the numerical methods are adopted to solve and analyze the fluid problem. The computational fluid dynamics (CFD) simulation are the best alternative with several advantages such as allow to simulate using actual and model geometry scale in extreme condition of the fluid flow and the CFD simulation also have a good agreement with experimental data [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Propeller Performance Using Computational Fluid Dynamics Approach

Adam

Fitriadhy

Kong

et al. 2019

EPI-IJE

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A reliable prediction approach to obtain a sufficient thrust and torque to propel the ship at desired forward speed is obviously required. To achieve this objective, the authors propose to predict the thrust coefficient (KT), torque coefficient (KQ) and efficiency (η) of the propeller in open-water model test condition using Computational Fluid Dynamics (CFD) simulation approach. The computational simulation presented in the various number of rotational speed (RPM) within the range of advance ratio J=0.1 up to 1.05. The higher value of J leads to a decrease in 10KQ and KT. While the η increased steadily at the lower value of J and decreased at the higher value of J. The results also showed that the propeller with 1048 rpm obtains a better efficiency at J=0.95 with η= 88.25%, 10KQ=0.1654 and KT= 0.0942. The computation result is very useful as preliminary data for propeller performance characteristics.

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“…During recent years, Ghassemi et al worked on the different propulsor (poded propeller, ducted propeller, surface propeller and propeller with augmentation devices) numerical analysis by BEM and CFD [23][24][25], ship hullpropeller interaction [26], calculations of the sound pressure level of the marine propeller in low frequency [27], hydrodynamic characteristics of the ducted propeller and its different geometries effect [28] as well as the propeller efficiency enhancement of the blade's tip reformation [29]. Based on cited works, mathematical functions of the nonuniform wake flow entered to the propeller geometries is not well known.…”

Section: Introductionmentioning

confidence: 99%

Obtaining mathematical functions of the propeller thrust and torque coefficients fluctuations at non-uniform wake flow including geometry effects

Mahmoodi

Ghassemi

Nowruzi

2018

Mechanics & Industry

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The main purpose of this paper is to obtain mathematical functions of the propeller thrust and torque coefficients fluctuations at non-uniform flow. Two types of inflow wakes from Seiun-Maru ship and INSEAN 7000 DWT Tanker are investigated for the B-series propeller. The computed results include the thrust and torque coefficients fluctuations and their mathematical functions under the influence of two different wakes for one blade and all blades of the studied propellers. To this accomplishment, variation of thrusts and torques coefficients under different pitch ratio, expanded area ratio and number of blades are investigated using classical mathematical methods in one cycle and the Fourier coefficients with ten terms are presented for each case. The results of thrust and torque coefficients at different propeller geometries are presented and discussed.

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Propeller Efficiency Enhancement by the Blade's Tip Reformation

Cited by 9 publications

References 4 publications

Computational analysis on B-series propeller performance in open water

Computational analysis on B-series propeller performance in open water

Prediction of Propeller Performance Using Computational Fluid Dynamics Approach

Obtaining mathematical functions of the propeller thrust and torque coefficients fluctuations at non-uniform wake flow including geometry effects

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