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| 2. |
- Andersson, Jennie, 1986, et al.
(författare)
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In-Behind Performance of an Ice Classed Propeller in Model and Ship-Scale
- 2021
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Ingår i: Proceedings of IX International Conference on Computational Methods in Marine Engineering, MARINE 2021.
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Konferensbidrag (refereegranskat)abstract
- A CFD study in both model and ship-scale is conducted to compare the in-behind performance of an ice classed to a conventional propeller. In ship-scale the performance degradation of the ice classed propeller in-behind is less than in open water. Through evaluation of the blades performance tangentially and radially in the wake it is observed that the ice classed blade is superior at very low load, the blunter profiles is less sensitive to negative angles of attack. Contrary, in model-scale a larger difference in performance is noted between the propellers in-behind than expected from open water performance. This is most probably related to differences in Reynolds number between model-scale open water and self-propulsion tests, the thicker profiles of the ice classed propeller makes it additionally punished by the low Reynolds numbers of the self-propulsion tests.
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| 3. |
- Andersson, Jennie, 1986, et al.
(författare)
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On the Selection of Optimal Propeller Diameter for a 120-m Cargo Vessel
- 2021
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Ingår i: Journal of Ship Research. - 1542-0604 .- 0022-4502. ; 65:2, s. 153-166
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Tidskriftsartikel (refereegranskat)abstract
- In the preliminary design of a propulsion unit, the selection of propeller diameter is most commonly based on open water tests of systematic propeller series. The optimum diameter obtained from the propeller series data is, however, not considered to be representative for the operating conditions behind the ship, instead a slightly smaller diameter is often selected. We have used computational fluid dynamics to study a 120-m cargo vessel with an integrated rudder bulb–propeller hubcap system and a four-bladed propeller series, to increase our understanding of the hydrodynamic effects influencing the optimum. The results indicate that a 3–4% smaller diameter is optimal in behind conditions in relation to open water conditions at the same scale factor. The reason is that smaller, higher loaded propellers perform better together with a rudder system. This requires that the gain in transverse kinetic energy losses thanks to the rudder overcomes the increase in viscous losses in the complete propulsion system.
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| 4. |
- Andersson, Jennie, 1986, et al.
(författare)
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Propeller-hull interaction beyond the propulsive factors-A case study on the performance of different propeller designs
- 2022
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Ingår i: Ocean Engineering. - : Elsevier BV. - 0029-8018. ; 256
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Tidskriftsartikel (refereegranskat)abstract
- The propulsive factors are critical for scaling of model-test data, and hence important for the final power prediction. When comparing different propulsion systems based on model-scale tests, differences in propulsive factors, and hence the propeller-hull interaction, are often not well understood. In this study the propeller-hull interaction is instead described and compared using CFD for three different propulsion systems, a tip-unloaded ice-classed propeller, an ice-classed propeller with conventional radial load distribution and a non ice-classed propeller with conventional radial load distribution. To post-process the results KT/KQ is evaluated for one blade around a revolution and complemented with radial distributions of the same measure. Both tip-unloaded blades and sharp leading edges suffer in-behind due to poor performance at low load. Open water performance dependency on Reynolds number reveals that ice-classed propellers are more negatively influenced by the low Reynolds numbers of self-propulsion tests. Further, it is noted that a more even radial load distribution favours a low thrust deduction factor. Since the propulsive factors to a large extent are influenced by scale-effects and also due to that their association to the observed hydrodynamics makes the commonly applied scaling procedure of them questionable, they are not considered representative for ship-scale power prediction.
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| 5. |
- Gustafsson, Jennie, 1988-
(författare)
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En hyresmarknad i förändring
- 2023
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Ingår i: Plan : tidskriften för samhällsplanering. - 0032-0560. ; :7, s. 5-7
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 6. |
- Gustafsson, Jennie
(författare)
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En hyresmarknad i förändring
- 2022
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Ingår i: Plan : tidskrift för samhällsplanering. - : Föreningen för samhällsplanering. - 0032-0560. ; :7, s. 22-27
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 7. |
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| 8. |
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| 9. |
- Gustafsson, Jennie
(författare)
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Renovations as an investment strategy : circumscribing the right to housing in Sweden
- 2021
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Ingår i: Housing Studies. - : Informa UK Limited. - 0267-3037 .- 1466-1810. ; , s. 1-22
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Tidskriftsartikel (refereegranskat)abstract
- There is an emergent field of writings on financialized landlords’ undertaking of apartment renovations as an investment strategy and its effect on housing inequalities. Seldom do these studies contextualize these tendencies within countries’ specific housing policy traditions. Therefore, through a qualitative case study in a neighbourhood in Sweden, this paper aims to uncover how private landlords undertake renovations as an investment strategy and its effect on tenants and, in turn, on the hybrid character of a universal housing system. It finds that renovations enable landlords to extract value from the built environment while tenants experience rising rents, a lack of information, poor property maintenance, and apprehension. Hence, I argue that renovations represent an investment strategy that serves to undermine the traditional social right to housing within a universal housing policy context. The paper thus furthers knowledge on how the situatedness of financialization tendencies entails their translation through and transformation of housing systems.
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| 10. |
- Gustafsson, Jennie
(författare)
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Spatial, Financial and Ideological Trajectories of Public Housing in Malmö, Sweden
- 2021
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Ingår i: Housing, Theory and Society. - : Taylor & Francis. - 1403-6096 .- 1651-2278. ; 38:1, s. 95-114
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Tidskriftsartikel (refereegranskat)abstract
- Public housing has been one of the primary tools mobilized in Sweden historically to fulfil citizens' right to housing. However, the nominally universal character of public housing in the Swedish context has increasingly been circumvented through processes of segregation, residualisation, gentrification and displacement. Furthermore, previous housing research points to the neoliberal shift of Sweden's housing politics since the early 1990s, encompassing the deregulation of public housing at the national level. Focusing on the example of public housing, this paper argues for a multiscalar and nuanced understanding of housing neoliberalisation in Sweden, by investigating the change of public housing locally. The political landscape of public housing in different localities has been transformed as a result of interacting trajectories of spatial restructuring, financialisation and ideological reconstruction. The paper examines this conjunctural transformation empirically through a case study of public housing in the city of Malmö.
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