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• W2602454206 abstract "The following paper discusses an investigation into the development of a supercritical carbon dioxide turbine test facility at the University of Queensland. With designs of next generation turbines in its final phase, a means of characterising the performance of these pieces of turbomachinery is necessary. This paper, therefore, looks at modelling a transient turbine test facility which can operate as a Ludwieg Tube and an Isentropic Light Piston Tunnel. The common configuration of a LT comprises a converging-diverging nozzle, diaphragm which is burst (or valve that is opened) in order to pass the fluid through a test section and a dump tank. An ILPT combines this with isentropic compression via a piston. This paper utilises L1d3, a specialist simulation code for quasi one-dimensional gas dynamics developed at and utilised vastly throughout UQ [1]. The numerical modelling within the simulation code consists of a Lagrangian approach to modelling gas dynamics [1]. It was identified that L1d3 was able to model all aspects of the proposed facility with reasonable computation time, except that of the fast-acting plug valve. Therefore, in order to simulate the proposed facility, a way of modelling a fast acting plug valve within a one-dimensional Lagrangian solver would be required as well as integration within the existing L1d3 solver. It was decided that the thesis problem could be broken into 3 main stages. The first stage includes gaining a thorough understanding of the L1d3 solver, through replication of facilities which would operate similar to that of the proposed facility. The second stage was modelling the fast-acting plug valve as per the specifications of the Oxford HDT plug valve. A third order polynomial was developed relating the pressure acting on the valve to its opening time and a function was found for the area variation of the valve as a function of the maximum diameter, opening time of the valve and time. It was decided to have a model which can be varied over a specified number of points in order for the area variation to be gradual and take the shape of a second-order polynomial equation. The third stage involves integrating the model within L1d3, where 3 valve conditions (open, closed and in the process of opening) were coded into the existing system. A valve was implemented into the Oxford Gun Tunnel model and a sample simulation of the proposed facility was modelled. A number of validation and verification exercises identified that the selected model was appropriately implemented within L1d3. Thus, this paper appropriately meets its primary objective of developing a model for a valve in L1d3, and thus, documenting a sample simulation of the proposed turbine test facility." @default.
• W2602454206 created "2017-04-07" @default.
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• W2602454206 date "2017-02-20" @default.
• W2602454206 modified "2023-09-27" @default.
• W2602454206 title "A concept study for a piston driven sCO2 turbine test facility" @default.
• W2602454206 doi "https://doi.org/10.14264/uql.2017.186" @default.
• W2602454206 hasPublicationYear "2017" @default.
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