Generation and distribution of turbulence-induced forces on a propeller

Yao, Haoyu; Cao, Linlin; Wu, Dazhuan; Yu, F. Richard; Huang, Bin

doi:10.1016/j.oceaneng.2020.107255

Cited by 17 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The needed subgrid-scale viscosity is modelled by the Smagorinsky–Lilly model (Smagorinsky 1963) where is the Smagorinsky constant suggested by van Balen, Uijttewaal & Blanckaert (2009) and Yao et al. (2020), is the filter width, and is the filtered strain rate tensor. A standard van Driest damping function (van Driest 1956) is applied to prescribe near the solid walls.…”

Section: The Simulationmentioning

confidence: 99%

Aeroacoustic sources analysis of wake-ingesting propeller noise

Yangzhou

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

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.

show abstract

Section: The Simulationmentioning

confidence: 99%

Aeroacoustic sources analysis of wake-ingesting propeller noise

Yangzhou

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…Considering the detailed effects of forces, moments, torques, and vibration occurring in the propulsion system, it may be noticed that the propeller shaft during operation is subjected to a complex state of forces and loads [4,5]. The main load is primarily as a result of the shaft torque, which is created during the power transmission to the propeller.…”

Section: Loads Of Propeller Shaftmentioning

confidence: 99%

The Possibilities of Improving the Fatigue Durability of the Ship Propeller Shaft by Burnishing Process

2020

View full text Add to dashboard Cite

Heavily loaded structural elements operating in a corrosive environment are usually quickly destroyed. An example of such an element is a ship propeller operating in a seawater environment. This research presents a fatigue resistance test performed on elements operating in seawater. Different processing parameters applied on the samples in particular were compared with the specimens whose surface had been burnished differently and they were compared to specimens with a grinded surface. The research shows that the structural elements whose surface has been burnished can have up to 30% higher fatigue strength in a seawater environment than the elements whose surface has been grinded. During burnishing, an important feature of the process is the degree of cold rolling of the material. The resistance of the component to fatigue loads increases only to a certain level with increasing the degree of the cold rolling. Further increasing the degree of cold rolling reduces the fatigue strength. Introducing additional stresses in the components (e.g., assembly stresses) reduces the fatigue strength of this component in operation and these additional stresses should be accounted for while planning the degree of the cold rolling value. A device that allows for simultaneous turning and shaft burnishing with high slenderness is presented in the appendix of this article. This device can be connected to the computerized numerical control system and executed automatic process according to the machining program; this solution reduces the number of operations and cost in the process.

show abstract

Numerical study on transient hydraulic excitation force characteristics of a water jet mixed-flow pump during rapid startup period

Zeng,

Chen,

et al. 2023

J Mech Sci Technol

View full text Add to dashboard Cite

Generation and distribution of turbulence-induced forces on a propeller

Cited by 17 publications

References 31 publications

Aeroacoustic sources analysis of wake-ingesting propeller noise

Aeroacoustic sources analysis of wake-ingesting propeller noise

The Possibilities of Improving the Fatigue Durability of the Ship Propeller Shaft by Burnishing Process

Numerical study on transient hydraulic excitation force characteristics of a water jet mixed-flow pump during rapid startup period

Contact Info

Product

Resources

About