Blar i NTNU Open på forfatter "Bergan, Carl Werdelin"
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An Experimental Investigation of the Hydroynamic Damping of Vibrating Hydrofoils
Bergan, Carl Werdelin; Tengs, Erik Os; Solemslie, Bjørn Winther; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)As Francis turbines are chasing a higher efficiency, while trying to accommodate a wider load region, turbine blade fatigue is becoming a more pronounced problem. Details of the Fluid-Structure Interaction (FSI) between ... -
Damping Measurements on a Multi-Blade Cascade with Multiple Degrees of Freedom: A Francis-99 Test Case
Bergan, Carl Werdelin; Tengs, Erik Os; Solemslie, Bjørn Winther; Østby, Petter Thorvald Krogh; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2019)Due to thinner blades and higher demands for flexibility, the high-head Francis runners designed today face considerable challenges that severely affect the runners' expected lifetime. For many high-head Francis runners, ... -
Dynamic Loads on Francis Turbines: An Experimental Study
Bergan, Carl Werdelin (Doctoral theses at NTNU;2019:64, Doctoral thesis, 2019)There is an increasing need for stable and flexible renewable energy. This calls for better lifetime predictions for Francis runners, which in turn requires more knowledge on the dynamic loads on the runner blades. This ... -
Experimental Investigation of a High Head Model Francis Turbine During Steady-State Operation at Off-Design Conditions
Bergan, Carl Werdelin; Goyal, Rahul; Cervantes, Michel; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2016)Francis-99 is a set of workshops aiming to determine the state of the art of high head Francis turbine simulations (flow and structure) under steady and transient operating conditions as well as promote their development ... -
Experimental investigation on a high head model Francis turbine during load rejection
Goyal, Rahul; Bergan, Carl Werdelin; Cervantes, Michel; Gandhi, B. K.; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2016)Francis-99 is a set of workshop aiming to determine the state of the art of high head model Francis turbine simulations (flow and structure) under steady and transient operating conditions as well as to promote their ... -
Hydrodynamic Damping of a Fluttering Hydrofoil in High-speed Flows
Bergan, Carl Werdelin; Solemslie, Bjørn Winther; Østby, Petter Thorvald Haug; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2018)A hydrofoil resembling a high head Francis runner blade was submerged in a rectangular channel and attached to the walls in a fixed-beam configuration. The hydrofoil was excited by piezoelectric Macrofiber composite actuators ... -
Numerical and experimental investigation of the unsteady flow field over a simplified hydrofoil plate
Pislevikj, Jasmina (Master thesis, 2017)In this thesis, the behavior of a simplified hydrofoil in an unsteady water flow field is tested. Due to frequent load variations in high head Francis turbines, the runner vanes happen to break. Rotor stator interaction ... -
Transient LDV-measurements in the draft tube of a high head Francis turbine
Bergan, Carl Werdelin (Master thesis, 2014)Francis-99 is a series of upcoming workshops aimed at determining the state of the art of high head Francis turbine simulations. The scope of this essay is to provide empirical data to serve as validation for the CFD ...