Design, Development, Analysis, or Experimental Testing of Super Critical CO₂ Radial (Centrifugal) Compressors and Radial Turbines

Dear Colleagues,

Since the 1960s, the idea of using supercritical carbon dioxide (s-CO₂) as the working fluid in a Brayton power-cycle has been entertained. But due to the technical limitations of the time, the idea did not progress much. Presently, due to the availability of more knowhow, better technological platforms, and advanced analysis tools, many believe it is time to revisit the idea of using s-CO₂ as the working fluid for power generation. Among various working fluids, s-CO₂ has several significant advantages over other fluids. Primarily the attractive qualities of s-CO₂ are high efficiency, much smaller turbomachinery size and plant footprint (and therefore lower capital cost), and the potential for full carbon capture. However, the realization of these benefits will depend on overcoming several technical, engineering, and materials science challenges. Though, theoretically, the concept is highly attractive and promising, there is a major hurdle to be passed, namely, the designing, developing, and testing of a reasonable size (10MWe or higher) prototype of an s-CO₂ Brayton-cycle-based power gas turbine. The US Department of Energy and other international government and institutes have specified that the radial (centrifugal) compressors and turbines are the ideal turbomachinery for a power gas turbine with power output up to 10MWe. To develop the s-CO₂ centrifugal compressor for this requirement there are three major compressor and turbine development challenges:

• Thermodynamic properties, an appropriate equation of state, and relations between stagnation and static properties.
• Aerodynamic design: compressors designers feel that at the critical point sCO₂ shows some unusual characteristics never considered before in compressor design, such as the strong variation in the ratio of specific heats, as well as the low compressibility factor of the gas. This leads to the uncertainty, whether the compressor should be designed according to the well-established guidelines for pumps or ideal gas compressors or whether a new theory is needed.
• Numerical simulation and testing challenges.

This Special Issue of Applied Sciences (ISSN 2076-3417) invites authors to submit papers that address, but are not limited to, the topics of “Design, Development, Analysis, or Experimental Testing of Super Critical CO2 Radial (Centrifugal) Compressors and Radial Turbines” for the power output of 10MWe"

Prof. Dr. Abraham Engeda
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• Critical CO2 Brayton cycle
• centrifugal compressor
• radial turbine
• critical CO2 gas turbine
• power generation gas turbine
• compressor and turbine design