DEVELOPMENT OF THERMOFLUIDIC DESIGN TOOL FOR ORGANIC RANKINE CYCLE AXIAL AND RADIAL INFLOW TURBINES

Date

2023-9-05

Author

Bilgiç, Mustafa

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In this thesis, preliminary and detailed design tools are developed for axial and radial inflow turbines used in organic Rankine cycle power systems. Within the design system, meanline design, meanline analysis, blade generator, streamline throughflow, time marching throughflow, and blade-to-blade solvers have been developed. The meanline design tool determines flow path dimensions and calculates initial power output and pitchline thermokinetic parameters. The quasi-1D meanline solver, developed to perform off-design analysis using the boundary conditions and flow path dimensions obtained from the meanline design, is effectively linked to the meanline design code. In this way, it is possible to determine the characteristics of the turbine at off-design points even at the preliminary design stage. The results of the meanline design code were also transferred to the streamline throughflow code, and the hub-to-type variation of thermodynamic and kinematic parameters along each blade row was obtained. The streamline throughflow code takes the tangential velocity distribution along the blade row exit as input and allows the determination of the blade inlet and outlet metal angles. These blade metal angles are then given as input to the blade generator code and two- and three-dimensional blade design is performed in this module. Streamline flow cannot provide realistic results within the blade passage and end wall region. For this reason, the open-source Multall flow solver has been included in the design system to more realistically solve both the blade passage and endwall boundary layer effects. The final part of the design system, the time marching blade to blade solver, which is mostly used for axial turbines, calculates the performance of the blade in a quasi three-dimensional computational domain. This code is used to determine the pressure distribution on the suction and pressure surfaces of the blade and to determine the lift characteristics of the blade. Necessary corrections are also made regarding the loss treatment of the organic gas flow within the solvers. In the literature, empirical relations derived for gas turbines are used for organic Rankine cycle applications and real gas effects are usually ignored. In this work, real gas effects are also analyzed and necessary corrections are made in the empirical relations. Each solver has been validated with test cases found in the literature.Keywords: Organic

Subject Keywords

Organic Rankine Cycle, Meanline, S1 Calculation, S2 Calculation, Blade Generator, Real Gas Flow

URI

https://hdl.handle.net/11511/105433

Collections

Graduate School of Natural and Applied Sciences, Thesis