Heavy Interest in the Lightest Element: Hydrogen

by Mark R. Anderson, CTO of Concepts NREC on Oct 1, 2021 11:00:00 AM

It’s always interesting to look at the topics of my favorite engineering conferences and see what’s in vogue in a given year. What jumped out at me this year at the ASME TurboExpo was the hot topic of hydrogen.

Meet Claudio Raia

by Kate Guerrina, Marketing Manager on Sep 17, 2021 11:00:00 AM

Dave Schowalter, Director of Global Software Sales, introduces you to Claudio Raia, our newest team member and the Managing Director of Concepts NREC Europe. Welcome Claudio!

To The Question of sCO2 Compressor Upstream Conditions Selection

by Oleg Zubalev, CAE Software Design Engineer on Sep 10, 2021 10:00:00 AM

The compressor is generally one of the most sensitive components of an sCO2 cycle. This makes it a challenge to design a robust compressor while keeping the thermodynamic cycle close to optimal.

Preliminary Design Considerations of Zero Reaction Stages in Turbines

by Oleg Dubitsky, Distinguished Corporate Fellow, Director of Corporate Technology on Aug 27, 2021 11:00:00 AM

Low reaction stages are often used as control stages of steam turbines, ORC turbines,  drive and rocket turbopump turbines. Some of the benefits of low reaction stages vs higher reaction stages are: 


  • Smaller radial size (and weight) for the given power and rotation speed 
  • Compatibility with use of partial admission, which is used to accommodate low volumetric flow, with the needed low pressure gradients in the rotor blades to reduce leakage penalties 
  • Both above factors allow increasing of nozzle and rotor blade heights 
  • Smaller radial size provides lower disk rim speeds and disk stresses 
  • Low reaction generally means lower axial thrust of the rotor 
  • Velocity stage configurations are possible for low reaction designs (Curtis stage for example, Fig.1). Velocity stages allow further reduction in radial size and increasing blade heights 

What Are the 5 Axes in 5 Axis Machining?

by Christos Maninos, CAM Application Engineer & Peter Klein, Director, CAM Software on Aug 13, 2021 4:00:00 PM

What is 5 axis machining? In short, it is manufacturing a component on a CNC milling machine that can travel in 5 different directions. These machines allow the cutting tool to reach around parts with a high degree of freedom. This makes them ideal for milling the complex shapes of turbo machinery components.

For lower thrust rocket engine designs, either a Gas Generator (GG) cycle or a Dual Expander (DE) cycle can be considered, among others. While each of these cycles has its inherent advantages and disadvantages in an overall sense, each cycle requires a different approach to the turbopump assembly (TPA) design. This blog presents a general summary of advantages and disadvantages of each of these cycles, and obviously applies when the engine thrust level is low enough that a DE cycle can even be considered (less than about 50,000 lbf of thrust). This summary is not exhaustive and focuses primarily on the TPA, but provides information to help decide which cycle to use.

Use of Optimization in Turbomachinery Design Process

by Akshay Bagi, General Manager, Concepts NREC India Private Limited on Jun 4, 2021 11:00:00 AM


With the advancements in computation power, optimization is not just limited to academics and research anymore. It can now be realistically used for industrial designs. There are several optimization software available in the market which utilize various powerful optimization techniques but not every software can be practical for industrial applications. This is especially true for the turbomachinery industry. Turbomachinery design is coupled with aero and mechanical optimization. The problems are highly constrained and usually involve non-linear functions. The optimization algorithm needs to be efficient to handle such problems.

How Many Pieces of Turbomachinery (Fans, Blowers, Compressors, Turbines, Pumps) Do You Have in Your House? Part 2

by Daniel V. Hinch, Corporate VP Sales and Marketing, Concepts NREC on May 14, 2021 11:00:00 AM

In my last blog I wrote about visiting a local middle school to give a talk on ‘What is Turbomachinery, and How Does It Work?’   The quiz at the end of the talk was for the students to list all the turbomachinery in their home. I had a few examples in mind to get the list started but was impressed with how long of a list we were able to generate after the students thought about it for a while. Since then the list has grown to include 40 items.   I will present those 40 below, but first let me repeat the assignment and the ground rules to see if you can think of more:


  1. List every piece of turbomachinery in your home.
  2. Inside and outside (in your yard is OK).
  3. Positive displacement equipment is OK to list.
  4. Don’t include turbomachinery in your cars or any vehicle or wheeled yard equipment (that’s another list…)

What Fluid Model Should I Choose?

by Mark R. Anderson, CTO of Concepts NREC on Apr 30, 2021 11:00:00 AM

When starting a turbomachinery design, the first choice an engineer has to make is the thermodynamic model. The actual fluid type (air, water, R1234ze, etc) is usually clear enough, but what model approach should be selected? Looking at the fluid dialog in Concepts NREC software shows a myriad of options to choose from.

How Many Pieces of Turbomachinery do You Have in Your House?  (and a Pop Quiz)

by Daniel V. Hinch, Corporate VP Sales and Marketing, Concepts NREC on Apr 16, 2021 11:00:00 AM

On occasion I’m invited to a local middle school to give a talk to one of the science classes about ‘What Is Turbomachinery, and How Does It Work?’.   I teach in several of the turbomachinery design courses we give at Concepts NREC, and while I’m comfortable in those courses, presenting at this level was different. I originally found it a challenge to come up with a good presentation that would keep the students' attention, while still providing some science education as requested by the science teacher that invited me. Derivation of the Euler turbomachinery equation was probably out. The attention getters that seemed to work best to get the conversation going included bringing our turbocharger cut-away (definitely the biggest hit of anything I brought), along with other interesting impeller samples. From there getting into the purpose of various types of turbomachinery (compressor vs turbine vs pump) and a very high level discussion of energy transfer to/from a fluid, seemed to flow. Getting them thinking about some of the physical aspects of turbomachinery operation (Just how fast is 100,000 rpm?) also seemed to keep their attention.

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