Sonny Andersson | Chalmers University of Technology (original) (raw)

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Papers by Sonny Andersson

Research paper thumbnail of Aerodynamic design of a two-stage supersonic/transonic turbine for space applications

Research paper thumbnail of Performance test results for the Vulcain 2 supersonic/transonic turbine

Research paper thumbnail of A study of tolerance impact on performance of a supersonic turbine

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2007

New manufacturing processes have been developed at VAC (Volvo Aero Corporation) which will ensure... more New manufacturing processes have been developed at VAC (Volvo Aero Corporation) which will ensure that company programs focusing on space propulsion are well in line with industry trends pointing towards lowering production cost. One of these investments, described in this paper, is the development of a patented version of EDM (Electro Discharge Machining) — a process for shrouded turbine vanes and rotors. As a part of verifying this process, an extensive study has been conducted to examine the impact of tolerances on turbine efficiency. The results presented in this paper are applicable to supersonic turbine blades. Experience from both tests and numerical studies have been combined to gain further understanding of the impact of tolerances on the turbine efficiency. The range of tolerances used in this study has its origin in manufacturing processes for other products of similar geometrical size. CFD has been the main tool used for this, capturing the influence of typical blade parameters, such as leading- and trailing-edge thickness, chord, fillet radius, stagger and blade thickness. Parameters that can not be addressed on a single blade, such as relative positioning between blades, has been assessed from cascade tests. This study shows that supersonic turbines are sensitive to geometrical imperfections, with a drop of several percentage points in overall efficiency for small variations in tolerances.

Research paper thumbnail of Parametric Model of Dead Leg Steady-State Thermal Performance

During thermal design of Subsea Production Systems (SPS), Computational Fluid Dynamics (CFD) is u... more During thermal design of Subsea Production Systems (SPS), Computational Fluid Dynamics (CFD) is used to calculate production fluid temperatures in dead legs of the system. One purpose of such simulations could be to calculate the amount of insulation needed to avoid low temperatures in the piping system. A novel approach to this type of analysis is presented here to build a parametric model able to map the dead leg performance against any set of input parameters. The workflow relies on a response surface analysis performed from the results of a limited set of CFD simulations run on a sparse simulation matrix that covers the design space. Once generated, the parametric model provides real-time results and may be used for screening, optimization or condition monitoring purposes.

Research paper thumbnail of Aerodynamic design of a two-stage supersonic/transonic turbine for space applications

Research paper thumbnail of Performance test results for the Vulcain 2 supersonic/transonic turbine

Research paper thumbnail of A study of tolerance impact on performance of a supersonic turbine

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2007

New manufacturing processes have been developed at VAC (Volvo Aero Corporation) which will ensure... more New manufacturing processes have been developed at VAC (Volvo Aero Corporation) which will ensure that company programs focusing on space propulsion are well in line with industry trends pointing towards lowering production cost. One of these investments, described in this paper, is the development of a patented version of EDM (Electro Discharge Machining) — a process for shrouded turbine vanes and rotors. As a part of verifying this process, an extensive study has been conducted to examine the impact of tolerances on turbine efficiency. The results presented in this paper are applicable to supersonic turbine blades. Experience from both tests and numerical studies have been combined to gain further understanding of the impact of tolerances on the turbine efficiency. The range of tolerances used in this study has its origin in manufacturing processes for other products of similar geometrical size. CFD has been the main tool used for this, capturing the influence of typical blade parameters, such as leading- and trailing-edge thickness, chord, fillet radius, stagger and blade thickness. Parameters that can not be addressed on a single blade, such as relative positioning between blades, has been assessed from cascade tests. This study shows that supersonic turbines are sensitive to geometrical imperfections, with a drop of several percentage points in overall efficiency for small variations in tolerances.

Research paper thumbnail of Parametric Model of Dead Leg Steady-State Thermal Performance

During thermal design of Subsea Production Systems (SPS), Computational Fluid Dynamics (CFD) is u... more During thermal design of Subsea Production Systems (SPS), Computational Fluid Dynamics (CFD) is used to calculate production fluid temperatures in dead legs of the system. One purpose of such simulations could be to calculate the amount of insulation needed to avoid low temperatures in the piping system. A novel approach to this type of analysis is presented here to build a parametric model able to map the dead leg performance against any set of input parameters. The workflow relies on a response surface analysis performed from the results of a limited set of CFD simulations run on a sparse simulation matrix that covers the design space. Once generated, the parametric model provides real-time results and may be used for screening, optimization or condition monitoring purposes.

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