Joel Sundström
Joel Sundström

Joel Sundström

Forskare
Luleå tekniska universitet
Strömningslära
Strömningslära och experimentell mekanik
Institutionen för teknikvetenskap och matematik
joel.sundstrom@ltu.se
0920-491627
Luleå

Hydropower is a clean and sustainable source of electricity and delivers about 50 % of the Swedish supply.My research project is a part of Swedish Hydropower Centre (SVC), a centre for education and research within hydropower and mining dams (www.svc.nu).

My research focuses on hydraulic turbine flow rate measurements with the Pressure-Time (Gibson) method. Accurate flow rate measurements are challenging in low head machines (<50 m) due to the short water passages and geometrical variations. Accurate flow rate measurements are important for hydraulic turbine owners. The measurements are used to asses turbine efficiency and optimize economical income from production. One commonly utilized method is the Pressure-Time method. The Pressure-Time method is based on the change of momentum of the fluid into pressure during closure of the guide vanes. By measuring the pressure difference between two different sections, the force acting on the fluid volume between the two sections may be related to the fluid acceleration, and thus the flow rate before commencement of the closure sequence.

My research topics concerns how to more accurately model the frictional losses in the Pressure-Time evaluation procedure. This is done by experimental analyses involving particle image velocimetry, constant temperature anemometry and pressure measurements along with numerical validation of the test cases.

Publikationer

Artikel i tidskrift

Evaluation of transient effects in the pressure-time method (2019)

Saemi. S, Sundström. J, Cervantes. M, Raisee. M
Flow Measurement and Instrumentation
Artikel i tidskrift

Improved frictional modelling for the pressure-time method (2019)

Sundström. J, Saemi. S, Raisee. M, Cervantes. M
Flow measurement and instrumentation
Artikel i tidskrift

Characteristics of the wall shear stress in pulsating wall-bounded turbulent flows (2018)

Sundström. L, Cervantes. M
Experimental Thermal and Fluid Science, Vol. 96, s. 257-265
Artikel i tidskrift

Laminar similarities between accelerating and decelerating turbulent flows (2018)

Sundström. J, Cervantes. M
International Journal of Heat and Fluid Flow, Vol. 71, s. 13-26
Artikel i tidskrift

On the Similarity of Pulsating and Accelerating Turbulent Pipe Flows (2018)

Sundström. J, Cervantes. M
Flow Turbulence and Combustion, Vol. 100, nr. 2, s. 417-436