Super Critical CO2 Compressor Design

by Mark R. Anderson, CTO of Concepts NREC on Aug 14, 2020 11:00:00 AM

Super critical carbon dioxide power (sCO2) cycles are attracting a lot of interest these days all over the world. Many initiatives using various levels of private and public funding are in progress in several countries right now. Preliminary testing on small scale units have shown that such systems are technically viable. The next round of larger scale testing under way now will determine if the concepts are financially viable as well.

Turbomachinery Design for Medical Devices Including Compressors, Fans, Blowers, and Pumps

by Daniel V. Hinch, Corporate VP Sales and Marketing, Concepts NREC on Aug 7, 2020 11:00:00 AM

Turbomachinery is used in a very wide variety of industries and applications.   While applications like aerospace ‘jet engines’ or powerplant steam turbines are the applications that come to mind for a lot of people, turbomachinery is integrated with or buried in a huge range of other equipment, and often transparent to the user.   I give a talk to local middle school sciences classes on what turbomachinery is, and give a quiz at the end of the talk where I ask them to list every piece of turbomachinery in their home. The students have surprised me with their understanding and reasoning ability, and I now have a list of 20 to 30 examples of turbomachinery running in their homes.

Flow Analysis of Multi-Staged Axial and Radial Turbomachinery

by Mark R. Anderson, CTO of Concepts NREC on Feb 6, 2020 12:58:56 PM

When designing a turbomachine, the best analytical approach is not necessarily the most accurate method possible, but the one that will generate the best candidate design in the time and budget available.  It makes little sense to do analytical work down to a 1/10% accuracy,  while ignoring candidate designs that might yield improvements 20 times that amount if they were considered in the first place.  Mastering the art of modern engineering requires an intuitive sense for the cost and accuracy of a given analytical method, and knowing when to move between them. 

This blog article is a follow up for the earlier blog “Coupled Optimization of Preliminary Design Geometry of Low Flow  Steam Turbine with Curtis Stage Layout and Rankine Cycle Parameters”, which considers more complicated case  of coupled optimization of regenerative Rankine cycle and 2 stage turbine geometry with change from partial to full admission flow.

Designing turbines for low flow Rankine Cycle for steam is challenging due to their small size, manufacturing restrictions, clearances and cost constraints. Such turbines operate at significant pressure ratios that require use of partial admission and are likely to operate in choked supersonic flow mode due to reduced stage count (controlled by cost).

In many instances, the design of new turbofan engine is an iterative process of optimizing engine cycle parameters (i.e. thermodynamics) and executing  preliminary design geometry of engine components (i.e. aero design, constrained with structural, manufacturing, fitting in engine layout, size, weight  & other requirements) for the best performing  realizable  solution.  Consideration of the preliminary design of the engine in the totality of these requirements seems to be an interesting topic to address.


 Coupling cycle calculations with detailed preliminary design of turbomachinery components for getting optimized turbofan engine is the topic of this article. Detailed preliminary design means generating geometry and getting flow data and performance for each component of the multistage geometry of the engine, sufficient in the scope to move design process to 2D and 3D considerations.

Super Critical Carbon Dioxide Turbomachinery Design

by Mark R. Anderson on Nov 8, 2019 1:49:58 PM

Why supercritical CO2?


Super critical carbon dioxide (sCO2) is one of the hottest topics in the turbomachinery world right now.  From my own experience, I remember when the subject occupied a few sleepy sessions at the ASME Turbo Expo several years back.  Today, its possible to spend the entire week at the conference and never leave a well-attended session dedicated specifically to sCO2

The Map Is Not the Terrain

by Thiago Ebel on Oct 25, 2019 11:19:06 AM

I remember my geography high school teacher talking about maps and how the different projections of the actual globe change the way we visualize it in 2D views. 



Figure 1 - Photo by Muhammad Haikal Sjukri on Unsplash -


Increased Milling Capability and Capacity for Large 5-Axis Impellers

by Sean McDermott on Aug 30, 2019 9:19:33 AM

Concepts NREC has added two additional Hermle 5-axis mills in our shop, and we’re excited 

about the increased capabilities these new machines bring! In August of 2018 we received the 

first of these mills, a 2018 Hermle C52uMT.  Just recently, in May of 2019, we added a Hermle C42u

In addition to these new, state-of-the-art 5-axis Hermle mills, our shop utilizes a Mikron HSM600U, good for parts up to ~13” in diameter; a Hermle C40, which can mill parts up to ~20” in diameter, and a Mitsui Seiki HS5A-80, which can handle larger parts, up to ~32” in diameter.  We now have a full range of  5-axis mills capable of producing the most challenging parts from >1 inch up to over 39 inches in diameter.  

Putting Entropy to Work

by Francis A. Di Bella, P.E. on Aug 2, 2019 10:21:55 AM

The previous blog, Entropy Happens… Deal with It! ended with the statement, “That’s how Concepts NREC deals with the constraints of the Second Law of Thermodynamics when designing high-efficiency turbomachinery – we literally put entropy to work!” That blog not only lead to an increase in sales of bumper sticker sales emblazoned with “Working on it, STAY TUNED!”, it led to a request to explore this statement in a little more detail – particularly as the idea might apply to the analysis, design and manufacturing of turbomachinery.