Zobrazeno 1 - 10
of 35
pro vyhledávání: '"J. Gunnar I. Hellström"'
Publikováno v:
Journal of Rock Mechanics and Geotechnical Engineering, Vol 15, Iss 9, Pp 2375-2387 (2023)
Rock block removal is the prevalent physical mechanism for rock erosion and could affect the stability of dam foundations and spillways. Despite this, understanding of block removal is still inadequate because of the complex interactions among block
Externí odkaz:
https://doaj.org/article/646cb2958f194cbf89356ba756aec9f6
Autor:
P. A. Mikael Hedberg, J. Gunnar I. Hellström, Anders G. Andersson, Patrik Andreasson, Robin L. Andersson
Publikováno v:
Water, Vol 16, Iss 6, p 871 (2024)
Measurements of mass flow through a three-outlet spillway modeled after a scaled-down spillway were conducted. The inlet and channel leading up to the outlets were placed to lead the water toward the outlet at an angle. With this, measurements of the
Externí odkaz:
https://doaj.org/article/2946b5a4f13c48078b93b2b2e8972681
Publikováno v:
International Journal of Sustainable Energy, Vol 39, Iss 1, Pp 21-40 (2020)
Entrained flow gasification of biomass in a cyclone reactor combined by a gas engine has been applied in Nordic countries as one of the preferred methods for generating combined heat and power in small scales. The purpose of the current study was to
Externí odkaz:
https://doaj.org/article/f8ad0f537a824212ae32ca2e3a54e4cb
Autor:
Hang Trieu, Per Bergström, Mikael Sjödahl, J. Gunnar I. Hellström, Patrik Andreasson, Henrik Lycksam
Publikováno v:
Water, Vol 13, Iss 12, p 1675 (2021)
This study describes a multi-camera photogrammetric approach to measure the 3D velocity of free surface flow. The properties of the camera system and particle tracking velocimetry (PTV) algorithm were first investigated in a measurement of a laborato
Externí odkaz:
https://doaj.org/article/4a8be1a0d0e1400ba4718c8cb554b437
Publikováno v:
Water, Vol 12, Iss 6, p 1585 (2020)
The operating conditions of Nordic hydropower plants are expected to change in the coming years to work more in conjunction with intermittent power production, causing more frequent hydropeaking events. Hydropeaking has been shown to be detrimental t
Externí odkaz:
https://doaj.org/article/719eac067999494495154265a597a044
Publikováno v:
Water, Vol 11, Iss 8, p 1562 (2019)
The fluid dynamics within a water tunnel is investigated numerically using a RANS approach with the k- ε turbulence model. The computational model is based on a laser scan of a hydropower tunnel located in Gävunda, Sweden. The tunnel has a typical
Externí odkaz:
https://doaj.org/article/c6efdd8f936445898439348d94238412
Hydropower is an important tool in the struggle for low-emission power production. In the Nordic countries, hydropower operating conditions are expected to change and work more in conjunction with intermittent power production. This in turn might inc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd83771f0a7dee1508fdd053fee8dbfe
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-94340
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-94340
Autor:
J. Gunnar I. Hellström, Anton J. Burman, I. A. Sofia Larsson, L. Robin Andersson, Patrik Andreasson
Publikováno v:
Journal of Hydraulic Research. 59:100-108
Hydropower tunnels are generally subject to a degree of rock falls. Studies explaining this are scarce and the current industrial standards offer little insight. To simulate tunnel conditions, high...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::72600858b7b741d3501df3f7ddd0c34f
https://doi.org/10.1080/00221686.2020.1744744
https://doi.org/10.1080/00221686.2020.1744744
Publikováno v:
Transport in Porous Media. 131:739-765
The aim of the present paper is to evaluate and compare the pore level hydrodynamic dispersion and effects of turbulence during flow in porous media. In order to compute these quantities, large eddy simulations of turbulent flow in five unit cells co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f89b8269beed24454c523d2a4bfbefb0
https://doi.org/10.1007/s11242-019-01365-0
https://doi.org/10.1007/s11242-019-01365-0
Publikováno v:
International Journal of Sustainable Energy. 39:21-40
Entrained flow gasification of biomass in a cyclone reactor combined by a gas engine has been applied in Nordic countries as one of the preferred methods for generating combined heat and power in small scales. The purpose of the current study was to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fa10d8a65f12bb93f3e16c395898549
https://doi.org/10.1080/14786451.2019.1626858
https://doi.org/10.1080/14786451.2019.1626858