Numerical study on self-propulsion of a waterjet propelled trimaran

Guo, J.; Chen, Zuogang; Dai, Yuanxing

doi:10.1016/j.oceaneng.2019.106655

Cited by 23 publications

(6 citation statements)

References 7 publications

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“…Mesh refinement is applied in the inlet duct, inside the duct, and around the spout. the shear stress transport (SST) k-ω turbulence model is adopted, which is a suitable model for rotating mechanical flow field calculations [12,13]. The viscosity solver based on separation flow, and the SIMPLE method is used to couple the pressure and velocity.…”

Section: Methodsmentioning

confidence: 99%

CFD-FEM Analysis of Flow-Induced Vibrations in Waterjet Propulsion Unit

Dai

Liu

Zhang

et al. 2022

JMSE

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This paper investigates the problem of vibration in an axial flow waterjet propeller with high power density and low specific speed. Based on fluid–structure coupling vibration analysis, combined with modal analysis and ship tests, the unsteady fluid–structure coupling of a waterjet propeller is examined, and the vibration characteristics of the propeller under different speed conditions are studied. The results show that the vibrations of the waterjet propeller mainly come from the frequency response of the rotor and the structural resonance response. The frequency distribution characteristics and amplitude intensity are observed to increase with increasing rotation speed. The variations in the propeller vibration characteristics, with respect to parameter changes, are analyzed at different gap spacings between the rotor and stator, allowing the variation law of vibration intensity with rotor stator spacing to be obtained.

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Section: Methodsmentioning

confidence: 99%

CFD-FEM Analysis of Flow-Induced Vibrations in Waterjet Propulsion Unit

Dai

Liu

Zhang

et al. 2022

JMSE

Self Cite

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“…Bianchi 14 reported the preliminary results of the energy and separation efficiency of the decanter centrifuge working in the industrial scale plant and found that the energy consumption was stable and similar under different flow rates. The parameterized geometric reconstruction of the duct and nozzle was carried out by Guo 15 to increase the thrust and efficiency of the waterjet system. Qiu 16 researched the influence of the main parameters of the inlet flow on the performance of the waterjet propulsor, and the influence of the height of the inlet flow channel axis and the inlet angle on the hydrodynamic performance under different inlet velocity ratio (IVR) conditions was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Study on the structure of energy‐saving bend pipes in a decanter centrifuge

Fu,

Li,

Zhou

et al. 2023

Asia-Pacific J Chem Eng

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Decanter centrifuges are widely used in solid–liquid separation, and saving their energy consumption is very important. In this paper, a bend pipe installed at the end of the decanter centrifuge was designed to save energy, and the effect of different structural parameters of the energy‐saving bend pipes on the outlet velocity and the reaction torque was investigated. The results revealed that the outlet velocity and the reaction torque were reduced with the increase in the number of pipes, outlet area, and pipe length. Increasing the radial position had little effect on the outlet velocity, but increased the reaction torque. Decreasing the outlet area and increasing the radial position both weaken the separation performance of the decanter centrifuge. The best separation performance and reaction torque effect were achieved in a suitable structure. Furthermore, the turbulent intensity was reduced from 143% to 135% in the new machine installed with bend pipes. The energy‐saving efficiency dropped with the increase of the rotational speed and the value was 13.1% under 2500 rpm. The separation performance of the new machine was similar to that of the original machine, and the dewatering speed was increased with the increase of the axial position.

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“…Liu and Chen [21] found that the non-uniform inflow reduced the external characteristics of the waterjet pump and led to the huge fluctuation of energy performance with time. Guo et al [22] adjusted the impeller rotational speed to balance the horizontal force of the waterjet-propelled trimaran, and then determined the self-propulsion point. Ji et al [23] studied the effect of improving the blade tip size in pump-jet propulsor through CFD numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Self-Propulsion of a Waterjet-Propelled Ship with Different Propulsion Models

Zhang

Yang

2022

Applied Sciences

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The hydrodynamics of the waterjet-propelled ship is a challenging issue due to the sophistication of waterjet system geometry as well as waterjet–hull interaction. In current study, three different propulsion models, namely, multiple reference frame (MRF) model, sliding mesh model and body-force model, are utilized to simulate the self-propulsion of a waterjet-propelled ship model. A body-force model based on a User-Defined Function (UDF) on the ANSYS Fluent platform is proposed. The computational cost, wave pattern, jet stream surface, and self-propelled hull resistance of the MRF model and body-force model are compared. Comprehensive comparisons of the internal ingested flow field of the control volume are made, especially at the capture area and nozzle section, with the two different models. In addition, the resistance increment fraction and jet system thrust deduction fraction with the two different models are investigated. Lastly, the flow field with the steady MRF model, the body-force model (RANS) and the transient sliding mesh model (URANS) are compared.

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Numerical study on self-propulsion of a waterjet propelled trimaran

Cited by 23 publications

References 7 publications

CFD-FEM Analysis of Flow-Induced Vibrations in Waterjet Propulsion Unit

CFD-FEM Analysis of Flow-Induced Vibrations in Waterjet Propulsion Unit

Study on the structure of energy‐saving bend pipes in a decanter centrifuge

Numerical Analysis on Self-Propulsion of a Waterjet-Propelled Ship with Different Propulsion Models

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