Session: 30-11 Testing 1

Paper Number: 129572

129572 - Experimental Study of the Real Gas Effects of CO2 on the Aerodynamic Performance Characteristics of a 1.5-Stage Axial Compressor 

The thermodynamic property of CO2 does not obey the ideal gas law and the simplified equation of state. And its enthalpy and sonic speed depend on temperature and pressure whereas the enthalpy and the speed of sound of ideal gas, like atmospheric air, depend only on its temperature. This real gas characteristics of CO2 add additional complexity not only in the design process of the CO2 compressor compared to air compressor, but also in the operation and testing of the CO2 compressor. For example, if the compressor inlet pressure changes during operation, its flow Mach number changes due to the change of the sonic speed which is followed by the change of its performance, choking characteristics. etc.

The present paper presents an experimental study on the real gas effect of CO2 gas on a 1.5 stage axial compressor. Its design speed and pressure ratio are 19,800 rpm 1.42 respectively. The testing was completed using a 10MW closed CO₂ compressor test loop at the University of Notre Dame. The compressor has been tested at various physical speeds, various inlet pressures, and various inlet temperatures with CO2 gas. It was tested with air as well for a comparison. Test results showed that corrected speed based on temperature only cause appreciable discrepancy of performance and thus cannot represent the corrected speed and performance speed line and that both temperature and pressure are required to define the corrected speed of the compressor, its performance characteristics, etc. for CO2 compressors.

Presenting Author: Jeongseek Kang University of Notre Dame

Presenting Author Biography: 1998.3-2002.2 - Ph.D, School of Mechanical and Aerospace Engineering, Seoul National University, South Korea
2002.3-2015.5 - Senior Researcher, Korea Aerospace Research Institute, South Korea
2015.6 - Current, Notre Dame Turbomachinery Lab, University of Notre Dame, IN, USA
current job title : Principal Research Scientist

Authors:

Jeongseek Kang University of Notre Dame
Alex Vorobiev University of Notre Dame
Joshua Cameron University of Notre Dame
Scott Morris University of Notre Dame
Mark Turner University of Cincinnati
Kyle Sedlacko Echogen Power Systems
Jason Miller Echogen Power Systems
Timothy J. Held Echogen Power Systems