Assessment of Real Gas Effects on S-CO2 Flows with Shock Waves
When the CO2 flows through the passages such as compressor or turbine, the state of CO2 changes from S-CO2 to G-CO2 or vice versa. At these conditions, the equation of state (EOS) which predicts one property is failed to calculate the other properties at one temperature and pressure. Hence, it is necessary to assess each EOS available before any computations have been started. In this present work, S-CO2 flow through an overexpanded nozzle is analyzed theoretically and computationally. For the theoretical study, one-dimensional gas dynamics equations were considered along with individual EOS. For the computational study, the 2-D Euler equations were considered. In comparison with flow field along the axis, it is found that consideration of different EOSs has so much deviation in flow properties due to different real gas effects.
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. NRF-2016R1A2B3016436).
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