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research-article

Thermal and transport Properties for the simulation of Direct-Fired sCO2 Combustor

[+] Author and Article Information
K.R.V. Manikantachari

Center for Advanced Turbomachinery and Energy Research, University of Central Florida, Orlando, FL, USA
raghuvmkc@Knights.ucf.edu

Scott Martin

Eagle Flight Research Center, Embry-Riddle Aeronautical University, Daytona Beach, FL, USA
martis38@erau.edu

Jose Bobren-Diaz

Center for Advanced Turbomachinery and Energy Research, University of Central Florida, Orlando, FL, USA
jobobren@Knights.ucf.edu

Subith Vasu

Center for Advanced Turbomachinery and Energy Research, University of Central Florida, Orlando, FL, USA
subith@ucf.edu

1Corresponding author.

ASME doi:10.1115/1.4037579 History: Received June 09, 2017; Revised July 04, 2017

Abstract

In this work, the behavior of thermal properties of sCO2 combustion at various reaction stages has been investigated by coupling real gas CHEMKIN (CHEMKIN-RG) with an in-house Premixed Conditional Moment Closure (PCMC) code and the high pressure Aramco-2.0 kinetic mechanism. Also, the necessary fundamental information for sCO2 combustion modelling is reviewed.The Soave-Redlich-Kwong equation of state (SRK EOS) is identified as the most accurate EOS to predict the thermal states at all turbulence levels. Also, an empirical model for the compression factor ?? is proposed for sCO2 combustors, which is a function of mixture inlet conditions and the reaction progress variable. This empirical model is validated between the operating conditions 250-300 bar, inlet temperatures of 800-1200 K and within the current designed inlet mole fractions and the accuracy is estimated to be less than 0.5% different from the exact relation. For sCO2 operating conditions the compression factor ?? always decreases as the reaction progresses and this leads to the static pressure loss between inlet and exit of the sCO2 combustor. Further, a review of high pressure viscosity and thermal conductivity models of mixtures and pure-components are presented from the literature and suggestions are made for their adoptability in sCO2 combustor simulations. The thermal properties such as specific heats, speed of sound, pressure exponent and isothermal compressibility are accurately quantified.

Copyright (c) 2017 by ASME
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