Effect of the odd and even number of blades on the hydrodynamic performance of a pre-swirl pumpjet propulsor

Qin, Denghui; Huang, Qiaogao; Pan, Guang; Chao, Li-Ming; Luo, Yang; Han, Peng

doi:10.1063/5.0080661

Cited by 28 publications

(7 citation statements)

References 30 publications

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“…(DDES), and improved DDES (IDDES) have been very popular in propeller wake studies [21][22][23][24][25][26][27][28][29][30][31]. Based on the literature survey presented above, it is evident that there are limited LES studies on propeller wakes under various loading conditions.…”

Section: Research Modelmentioning

confidence: 99%

“…Furthermore, CFD methods inevitably entail numerical dissipation, which introduces non-physical factors into the results. Recently, hybrid LES/RANS models such as DES, delayed DES (DDES), and improved DDES (IDDES) have been very popular in propeller wake studies [21][22][23][24][25][26][27][28][29][30][31]. Based on the literature survey presented above, it is evident that there are limited LES studies on propeller wakes under various loading conditions.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Propeller Wake Evolution under Different Advance Coefficients

Yu²,

Li³

et al. 2023

JMSE

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Propeller wake fields in an open-water configuration were compared between two loading circumstances using large-eddy simulation (LES) with a computational domain of 48 million grids and an overset mesh technique. To validate the results of the numerical simulation, available experimental data are compared, which indicates that the grid systems are suitable for the present study. The results indicate that the present LES simulations describe the inertial frequency range well for both high and low-loading conditions. Under high-loading conditions, the interlaced spirals and secondary vortices that connect adjacent tip vortices amplify the effects of mutual inductance, ultimately triggering the breakdown of the propeller wake systems. At a great distance from the propeller, the vortex system loses all coherence and turns into a collection of smaller vortices that are equally scattered across the wake. In contrast, under light-loading conditions, the wake vortex system exhibits strong coherence and has a relatively simple topology. The elliptic instability and pairing processes are only observed at a far distance from the propeller. The convection velocity transferring tip vortices downstream is larger under the light-loading condition, which leads to the larger pitch of the helicoidal vortices. The larger pitch weakens the mutual inductance or interaction effects among tip vortices, which delays the instability behaviors of the whole vortex system. The results and implications of this study serve as a guide for the development and improvement of next-generation propellers that function optimally when operating behind aquaculture vessels.

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Section: Research Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Propeller Wake Evolution under Different Advance Coefficients

Yu²,

Li³

et al. 2023

JMSE

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“…Wake-ingesting propellers in marine and aeronautical applications such as ships (Guo & Zou 2022;Qin et al 2022) and aircraft (Hall 2017;Lv et al 2017) are commonly found, and the fuel efficiency and integration flexibility of the pusher-propeller configuration make it an attractive candidate with increased interest for future low-speed aircraft designs (Arnhem, Vos & Veldhuis 2019;Tiseira Izaguirre et al 2022). Propellers ingesting non-uniform and turbulent flows can be the dominant source of unsteady aerodynamic forces and noise that creates serious concerns, including the operational restrictions of aircraft (Pardo & Hall 2021) and the detriment of concealment attributes for submarines (Blake 2017), where the urgent need for noise control strategies has emerged.…”

Section: Introductionmentioning

confidence: 99%

“…Wake-ingesting propellers in marine and aeronautical applications such as ships (Guo & Zou 2022; Qin et al. 2022) and aircraft (Hall 2017; Lv et al. 2017) are commonly found, and the fuel efficiency and integration flexibility of the pusher-propeller configuration make it an attractive candidate with increased interest for future low-speed aircraft designs (Arnhem, Vos & Veldhuis 2019; Tiseira Izaguirre et al.…”

Section: Introductionmentioning

confidence: 99%

Aeroacoustic sources analysis of wake-ingesting propeller noise

Yangzhou

et al. 2023

J. Fluid Mech.

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High resolution aeroacoustic source analysis is a prerequisite to address the noise concerns and release the full benefits of wake-ingesting propellers. In this work, the aeroacoustic sources of a two-bladed propeller ingesting the wake of an aerofoil are investigated using large eddy simulation in conjunction with two different source identifying approaches. The first approach is the numerical beamforming that utilizes both the classical and wavelet-based beamforming techniques, which determine the phase variations of sources at the low to mid frequencies and reveal that the high-frequency sources are phase-independent. To further improve the spatial resolution of source identification, a new near-field aeroacoustic source analysis approach based on the acoustic analogy is developed in this work. In particular, the on-surface source terms emanating the far-field noise are derived based on the Ffowcs Williams and Hawkings equation for low Mach number flows and constant rotating propellers. Through the incorporation of the simulation results into the proposed source analysis approach, various types of aeroacoustic sources are identified and studied by visualizing their distributions on the propeller surfaces, correlating to flow features and examining the noise spectra and directivity. While the leading edge sources are highly correlated with the wake interaction process, the sources at the mid-chord and the trailing edge of the blade can maintain their strength across most revolving angles. Overall, the proposed analysis approaches extend the capability of computational fluid dynamics and enable the detailed study of noise generation mechanisms of wake-ingesting propeller noise.

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“…In addition, the influences of odd and even numbers of blades on the hydrodynamic performance and flow field of PJPs have been studied. 18 Because of the unique structure of a PJP, the flow field at the clearance point is extremely complex. Lu et al, 19 Qiu et al, 20 and Yu et al 21 studied the influence of different tip clearance heights on the hydrodynamic performance of PJP.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the scale effects of pump-jet propulsor with a pre-swirl stator

et al. 2023

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In this study, the performance of a pump-jet propulsor (PJP) with pre-swirl stator in open water is numerically investigated. Both full-scale and model-scale configurations are considered. The Reynolds-averaged Navier–Stokes equations and shear stress transport [Formula: see text] turbulence model are used in the numerical calculation. The computational domain is discretized using structured grids, and a rotating grid is affixed to the rotor to deal with the relative motion between the rotor and stationary components. The mesh quality is determined based on a grid uncertainty analysis. The numerical method is validated using model-scale experimental data. The simulation results reveal the influences of the scale size on the hydrodynamic performance and the distributions of the velocity, pressure and vorticity under three advance coefficients. With the increase in the advance coefficients, the scale influences on the efficiency become more obvious, and the efficiency of the full-scale PJP is always higher than that of the model-scale PJP. The full-scale configuration is found with a more significant instability in the gap vortex development, because it presents larger interaction between tip leakage vortex (TLV) and the inner wall of the duct. As the main velocity increases, the TLV shedding is delayed. Finally, the development process of gap vortices is analyzed for the difference operation conditions.

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Effect of the odd and even number of blades on the hydrodynamic performance of a pre-swirl pumpjet propulsor

Cited by 28 publications

References 30 publications

Numerical Analysis of Propeller Wake Evolution under Different Advance Coefficients

Numerical Analysis of Propeller Wake Evolution under Different Advance Coefficients

Aeroacoustic sources analysis of wake-ingesting propeller noise

Numerical investigation of the scale effects of pump-jet propulsor with a pre-swirl stator

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