The effects of the aerodynamic interaction on the performance of two Flettner rotors

Bordogna, Gloria; Muggiasca, Sara; Giappino, Stefano Giuseppe; Belloli, Marco; Keuning, J A; Huijsmans, R.H.M.

doi:10.1016/j.jweia.2019.104024

Cited by 33 publications

(19 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Marco et al [11][12][13] assessed the impact of aspect ratio, spin ratio and end plate diameter on Flettner rotor performance; endplates installed on the Flettner rotor had a good effect. In reference [14], the relative position and velocity ratio of two Flettner rotors were tested and the conclusion was drawn that the velocity ratio and relative position were the decisive factors determining the influence of aerodynamic interaction on the performance of Flettner rotors. The flow structures with different Reynolds Numbers and different spin rates were discussed.…”

Section: Introductionmentioning

confidence: 99%

Study of a New Type of Flettner Rotor in Merchant Ships

Zhang

et al. 2021

Polish Maritime Research

View full text Add to dashboard Cite

Wind energy is a clean and renewable source of energy. This study seeks to explore the potential for utilising wind power for merchant ships. A new type of Flettner rotor (rotating cylinder) mounted on the superstructure of a ship is proposed and numerically simulated. The construction and installation of the rotating cylinder is designed and a numerical simulation of the ship-mounted cylinder is carried out, using the commercially available CFD code Ansys Fluent to obtain parameters such as lift and drag coefficient of the cylinder in different conditions. Specifically, it is found that the cylinder type superstructure can play a certain role in reducing the effect of friction by comparing traditional and cylindrical superstructures; the rotating cylinder can generate auxiliary thrust for the ship. After analysis, the wind speed around the cylinder and spin ratio will have a direct influence on its thrust effect; there is an inflection point in the lift coefficient with the increase of α; the thrust coefficient (8.63) reaches the maximum environmental wind speed at 10 m/s and spin ratio is 2.5. For the rotating cylinder, the greater the environmental wind, the greater the thrust contribution generated under the same spin ratio conditions. The maximum thrust can reach 750,000 N; the cylinder’s auxiliary propulsion contribution shows a better advantage in α = 2.0. The effective power generated by the cylinder reaches a maximum of 2,240 kW for environmental wind speed = 20 m/s and α = 1.0.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of a New Type of Flettner Rotor in Merchant Ships

Zhang

et al. 2021

Polish Maritime Research

View full text Add to dashboard Cite

show abstract

“…Condition (3.4) 2 aims at representing a regular inflow, which is expected to slightly modify after bypassing the obstacle, but then tends to recompose at the outflow face, as in (3.4) 3 (see [6] for experimental evidence). In fact, in a wind tunnel, the inflow is generated by a turbine (see the left picture in Figure 3.2), which usually reproduces a Poiseuille flow, which is faster at the midpoint of the inflow face and vanishes on the edges of this face, as modeled by (3.4) 2 .…”

Section: An Extension Results and Two New Inflow-outflow Modelsmentioning

confidence: 99%

“…Recent experimental and numerical evidence [6,37,38] shows that, at a sufficiently large distance behind the obstacle, the perturbed flow concentrates its turbulent motion mostly in the wake of the body, see Figure 1.1 for a wind tunnel experiment and [6,13] for some experimental data. It is then clear that different boundary conditions should be imposed on the outlet, see [21,23,28].…”

Section: Introductionmentioning

confidence: 99%

Solenoidal extensions in domains with obstacles: explicit bounds and applications to Navier-Stokes equations

Fragalà¹,

Gazzola²,

Sperone³

2020

Preprint

View full text Add to dashboard Cite

We introduce a new method for constructing solenoidal extensions of fairly general boundary data in (2d or 3d) cubes that contain an obstacle. This method allows us to provide explicit bounds for the Dirichlet norm of the extensions. It runs as follows: by inverting the trace operator, we first determine suitable extensions, not necessarily solenoidal, of the data; then we analyze the Bogovskii problem with the resulting divergence to obtain a solenoidal extension; finally, by solving a variational problem involving the infinity-Laplacian and using ad hoc cutoff functions, we find explicit bounds in terms of the geometric parameters of the obstacle. The natural applications of our results lie in the analysis of inflow-outflow problems, in which an explicit bound on the inflow velocity is needed to estimate the threshold for uniqueness in the stationary Navier-Stokes equations and, in case of symmetry, the stability of the obstacle immersed in the fluid flow.

show abstract

“…The power consumed by the motor and the thrust produced from the Flettner rotor will regulate the amount of the main engine power that can be replaced. The produced thrust can be calculated as the summation of the lift and drag forces in the ship direction (Ballini et al 2017 ; Bentin et al 2016 ; Bordogna et al 2020 ; Bordogna et al 2019 ; De Marco et al 2016 ; Kray et al 2012 ; Mittal and Kumar 2003 ; Traut et al 2014 ).…”

Section: Flettner Rotors’ Principles and Fundamentalsmentioning

confidence: 99%

“…can be calculated as a function of the rotor circulation Ω . The circulation can be calculated using known lift coefficients ( C L ) using Kutta-Joukowsky formula or from model tests (Abbot and Von Doenhoff 1959 ; Bordogna et al 2020 ). The relation between V ind.…”

Section: Flettner Rotor Modelingmentioning

confidence: 99%

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Seddiek

Ammar

2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

Shipping faces challenges of reducing the dependence on fossil fuels to align with the international regulations of ship emissions reduction. The maritime industry is in urgent need of searching about alternative energy sources for ships. This paper highlights the applicability of harnessing wind power for ships. Flettner rotors as a clean propulsion technology for commercial ships are introduced. As a case study, one of the bulk carrier ships operating between Damietta port in Egypt and Dunkirk port in France has been investigated. The results showed the high influence of the interaction between ship course and wind speed and direction on the net output power of Flettner rotors. The average net output power for each rotor will be 384 kW/h. Economically, the results reveal that the use of Flettner rotors will contribute to considerable savings, up to 22.28% of the annual ship’s fuel consumption. The pay-back period of the proposed concept will be 6 years with a considerable value of levelized cost of energy. Environmentally, NO x and CO 2 emissions will be reduced by 270.4 and 9272 ton/year with cost-effectiveness of $1912 and $55.8/ton, respectively, at annual interest rate of 10%.

show abstract

The effects of the aerodynamic interaction on the performance of two Flettner rotors

Cited by 33 publications

References 12 publications

Study of a New Type of Flettner Rotor in Merchant Ships

Study of a New Type of Flettner Rotor in Merchant Ships

Solenoidal extensions in domains with obstacles: explicit bounds and applications to Navier-Stokes equations

Harnessing wind energy on merchant ships: case study Flettner rotors onboard bulk carriers

Contact Info

Product

Resources

About