抄録
This paper presents a comprehensive study on the stagnation
properties namely the total pressure and total temperature for
supercritical CO2 flows including the methodology, applications
and detailed analysis. Due to the high nonlinear real gas effect, it is
practically impossible to have explicit expressions between static
and its corresponding stagnation properties. The equations of
obtaining the real gas stagnation properties as well as their physical
meanings related to fluid dynamics need to be reconsidered. In this
paper, the stagnation pressure and temperature for sCO2 flows are
accurately calculated in a way that implicitly iterated from
stagnation enthalpy and entropy without any addendum
assumptions. Accordingly, this approach is applied to typical
applications that essentially exert stagnation properties. The total
pressure and total temperature of typical sCO2 flows in which
contain significant real gas characteristics are numerically studied
by using our in-house CFD code coupled with real gas models. It is
found that the real gas tends to preserve more internal energy than
the ideal gas during irreversible flow process especially with the
presence of shockwaves. Finally, as a regular indicator of viscous
flow loss, the total pressure loss for a sCO2 compressor cascade is
evaluated.
