Suppression method for exciting force of pump jet propellers based on sinusoidal unevenly spaced rotor blades

Zhang, Yu; Han, Jieting; Huang, Bin; Zhang, Dahai; Wu, Dazhuan

doi:10.1016/j.oceaneng.2022.112198

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…The reason may be that under the high advance coefficient conditions, the thrust and torque decrease sharply, the real values may be covered by the error of the numerical simulation. Most researches [21,23,24] that carry out validation study by using DTMB 4119 propeller have the similar numerical results with current simulation.…”

Section: Validation Studysupporting

confidence: 61%

Numerical Study on the Unsteady Flow Field Characteristics of a Podded Propulsor Based on DDES Method

et al. 2022

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The podded propulsor has gradually become an important propulsion device for high technology ships in recent years because of its characteristics of high maneuverability, high efficiency, low noise, and vibration. The performance of podded propulsor is closely related to its flow field. To study the unsteady flow field characteristics of podded propulsor, the DDES (delayed detached eddy simulation) method was used to carry out high-precision transient numerical simulations. Results showed that the pod has a significant influence on the unsteady flow field. The rotor–stator interaction between the propeller and pod can be observed, leading to the periodic fluctuation of thrust on the propeller. On the surface of pod, pressure distribution changes with time, leading to the difference of local lateral force. In the spatial region affected by the propeller wake flow, pressure distribution presents a spiral characteristic, both in the region far away from the pod, and in the region of the wake flow of strut and fin. The vortex structures of podded propulsor are complex since the interference of the pod. In addition to the tip, root and hub vortex, strut and fin vortices also occur. The vortices generated by the effect of mutual inductance between vortices are also discussed.

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Section: Validation Studysupporting

confidence: 61%

Numerical Study on the Unsteady Flow Field Characteristics of a Podded Propulsor Based on DDES Method

et al. 2022

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“…The unsteady simulation revealed the relationship between the unsteady dynamic performance caused by the tip clearance and the pressure pulsation around the underwater vehicle. Zhang [18,19] studied the influence of blade number on the propulsion performance and excitation force of pump-jet propulsor by computational fluid dynamics method, and theoretically and numerically studied the excitation force generation mechanism of pump-jet propulsor ( PJP ) with uniform spacing and non-uniform spacing rotor blades ( ESB and UESB ) after standard submarine model. Some scholars have studied the parameter optimization method of water-jet propeller : Shi [20][21][22] compared the unsteady force spectrum and velocity spectrum characteristics of pump-jet with the characteristics of single rotor and ducted propeller to reveal the influence of duct and pre-swirl stator ; the flow-induced vibration and acoustic radiation characteristics of pump jet in water tunnel are studied.…”

Section: Research Status Of Hydraulic Performance Optimization Of Wat...mentioning

confidence: 99%

Research on hydraulic optimization design method of water-jet propulsion pump considering hump index

Long,

Zheng,

Han

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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：In order to improve the efficiency of water-jet pump and reduce or eliminate the hump phenomenon, it is necessary to optimize the impeller design. In this paper, the optimization of waterjet propulsion pump is studied by combining numerical simulation and experiment.The orthogonal optimization design scheme is established. Based on the numerical simulation method, the hydraulic performance indexes such as energy coefficient, torque coefficient and efficiency of the design points of different design schemes are obtained. The final optimization design is completed by further optimizing the profile and spatial position of the optimal efficiency factor level combination A2B1C1D1 at different spanwise heights.Then, based on the results of numerical simulation by CFX, using Python and LabVIEW programming software, a pump flow head curve fitting and hump judgment program is developed, which can realize the function of curve fitting of flow head, giving the position of trough and peak, and calculating the value of hump climbing coefficient Chump. The influence of different blade structure parameters on the hydraulic performance and energy characteristic curve hump of the water-jet pump is analyzed, and the optimization design of the high-performance water-jet pump considering the hump index is completed.In summary, This method is not only applicable to the hydraulic optimization of the water-jet propulsion pump, but also the research results can provide theoretical basis and technical support for the high-performance and low-vibration design of the water jet propulsion pump.

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Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors

Ji,

Zhang,

Yang

et al. 2024

J Hydrodyn

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The tip-clearance flow in a pump-jet propulsor exerts great impacts on the fluctuating pressures and resultant unsteady forces, which are important sources of structural vibrations and radiated noise underwater. The blade geometry close to the tip is an important factor determining the vortex strength in the tip-clearance flow. In the open-water condition, the effects of raking the rotor tips on duct-surface fluctuating pressures and the resultant unsteady forces acting on different components of the propulsor are investigated via physical model experiments and the numerical solution of Reynolds-Averaged Navier-Stokes equations coupled with the SST k- turbulence model. The measured and simulated results of hydrodynamic pressures are consistent to each other, and the simulated flows help better understand why the fluctuating pressures change with the tip geometry. The strong fluctuations of duct-surface pressures are caused by intensive tip separation vortices. The duct-surface pressure fluctuations are effectively reduced by using the rake distribution near the tip towards blade back side and, for the combination of the five-bladed rotor and the seven-bladed stator, the resultant unsteady horizontal (and vertical) forces acting on the duct and stator are also reduced. While increasing rake leads to negative effect on pressure fluctuations and unsteady horizontal (and vertical) forces acting on all the components of the propulsor.

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Suppression method for exciting force of pump jet propellers based on sinusoidal unevenly spaced rotor blades

Cited by 10 publications

References 29 publications

Numerical Study on the Unsteady Flow Field Characteristics of a Podded Propulsor Based on DDES Method

Numerical Study on the Unsteady Flow Field Characteristics of a Podded Propulsor Based on DDES Method

Research on hydraulic optimization design method of water-jet propulsion pump considering hump index

Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors

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