SpinOffs

A blog on what's new, notable, and next in turbomachinery

Posts about Compressor Design

Super Critical CO2 Compressor Design

Super Critical CO2 Compressor Design

By Mark R. Anderson, CTO of Concepts NREC
Aug 14, 2020

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...

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Entropy Happens… Deal with It!

Entropy Happens… Deal with It!

By Francis A. Di Bella, P.E.
Jul 19, 2019

If there’s one thing good about sitting in snarled traffic in Boston, it’s that you get to see some very original bumper stickers. The most recent bumper sticker I saw was probably the strangest one,...

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In Thermodynamics: “What Goes Around-Comes Around” is a Good Thing

In Thermodynamics: “What Goes Around-Comes Around” is a Good Thing

By Francis A. Di Bella, P.E.
Jun 28, 2019

When discussing the efficiency of transforming one form of energy to another, circularity is the way to go. Anyone who has spent even a little time studying engineering thermodynamics knows that the...

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Abstracts From Papers Presented at Turbo Expo 2019

Abstracts From Papers Presented at Turbo Expo 2019

By Barbara Shea
Jun 21, 2019

Wow, Concepts NREC had a lot going on at this year's ASME Turbo Expo 2019 in Phoenix, AZ! We held our North American CAE User Group Meeting, spoke to over 200 people at our booth, chaired several...

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What’s the Difference Between a Fan, a Blower, and a Compressor?

What’s the Difference Between a Fan, a Blower, and a Compressor?

By Dan Hinch
Jun 6, 2019

Turbomachinery equipment is generally segmented based on whether it extracts energy (e.g., turbines) or adds energy (e.g., pumps and compressors). The addition of energy is usually used to compress...

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Performance Corrections for Compressor Maps

Performance Corrections for Compressor Maps

By Mark R. Anderson
Apr 9, 2019

Turbomachinery performance is almost always analyzed and tested with a fixed inflow condition. In other words, the assumption is that the inflow fluid temperature and pressure is defined and...

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What's Better than Perfect? Semi-Perfect Gas Models

What's Better than Perfect? Semi-Perfect Gas Models

By Mark R. Anderson
Mar 8, 2019

In a previous blog, Fluid Phenomena Primer: Energy Versus Temperature, Specific Heat, I explained the behavior for gas phase fluids and how the temperature is affected at high energy levels.  In...

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Increases in Temperature Envelopes and Its Implications on Material Selection

Increases in Temperature Envelopes and Its Implications on Material Selection

By Arsalan Adil
Feb 1, 2019

Temperature envelopes in the turbomachinery industry are constantly increasing as the state of the art evolves in pursuit of better performance. This means engineers need to design compressors with...

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Specific Speed Demystified

Specific Speed Demystified

By Mark R. Anderson
Jan 11, 2019

In my blog Flow Coefficient and Work Coefficient, I outlined the basic concept behind the flow and work coefficient. These nondimensional parameters are widely used to characterize axial and radial...

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Flank Milling - How Hard Can It Be?

Flank Milling - How Hard Can It Be?

By Peter Klein
Jan 4, 2019

 When designing compressors, engineers often use ruled-surface blades with the goal of making a shape that’s easily manufactured on a 5-axis machine.  Theses blades can be quickly machined in one...

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20 Great Gifts for Engineers from $10 to $2 Million

20 Great Gifts for Engineers from $10 to $2 Million

By Barbara Shea
Nov 23, 2018

Gifts for Engineers can usually be segmented into a few categories: Things you have to put together, science fiction, gaming, new technology, and witty phrases printed on stuff. A Google search of...

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Extending the Operating Range of Centrifugal Compressors

Extending the Operating Range of Centrifugal Compressors

By Adam Weaver
Sep 28, 2018

Extending the operating range of centrifugal compressors has been a highly sought-after goal for several decades. In fact, the potential benefits have motivated researchers to develop and put into...

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Designing Turbomachinery is like Solving a Rubik's Cube

Designing Turbomachinery is like Solving a Rubik's Cube

By Barbara Shea
Sep 21, 2018

I think we can all agree that designing turbomachinery is hard. There are just so many moving parts (pun intended) in the design process, and they are all interconnected.  When you change the blade...

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Yellow Ropes

Yellow Ropes

By Jim Miller
Aug 17, 2018

In the mid 1980’s, while serving in the Canadian Air Force, I had the good fortune, on one of my many adventures, to fly into Sondrestrom Air Base in Greenland. The Base is at the head of a beautiful...

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The Challenges & Cures of CFD Solution Failures

The Challenges & Cures of CFD Solution Failures

By Mark R. Anderson
Aug 3, 2018

Computational fluid dynamic analysis (CFD) has become a standard part of the turbomachinery design process. Within Concepts NREC’s Agile Engineering Design System, FINE/Turbo, from our Partner NUMECA...

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The Slip Factor Model for Axial, Radial, and Mixed-Flow Impellers

The Slip Factor Model for Axial, Radial, and Mixed-Flow Impellers

By Mark Anderson and Chanaka Mallikarachchi
Jul 20, 2018

Ideally, the exit flow angle for an impeller should be the same as the exit blade metal angle. However, the exit flow angle deviates from the blade guidance at the impeller exit due to the finite...

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Engine-Driven Compressor for Maintaining Aircraft Cabin Pressure

Engine-Driven Compressor for Maintaining Aircraft Cabin Pressure

By Dan Hinch
Jul 11, 2018

Commercial and military aircraft require that preset levels be maintained for aircraft cabin pressure, airflow, temperature, and humidity — regardless of flight altitude and aircraft speed. To...

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Avoiding the

Avoiding the "Bad Day" in Aerospace

By Francis A. Di Bella, P.E.
Jul 6, 2018

The AS9100 Certification identifies companies who have qualified to manufacture products for the Aerospace Industry.  Manufacturers who meet the extensive requirements of the AS9100 Certification...

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A Small Taste of Two Papers from Turbo Expo 2018 in Norway

A Small Taste of Two Papers from Turbo Expo 2018 in Norway

By Barbara Shea
Jun 14, 2018

The 2018 ASME Turbo Expo in Lillestrøm, Norway was, as always,  a smorgasbord of papers and presentations on the latest and greatest ideas in turbomachinery and gas turbines. Two of our favorites...

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Optimizing the Radial-to-Axial Duct Geometry for a Gas Turbine Radial Compressor Impeller

Optimizing the Radial-to-Axial Duct Geometry for a Gas Turbine Radial Compressor Impeller

By Oleg Dubitsky
Apr 13, 2018

Many gas turbines with radial compressors utilize a radial-to-axial inlet duct upstream of the first compressor stage. Aside from the fact that flow in the duct generates aerodynamic losses, the flow...

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Flow Coefficient and Work Coefficient Applications

Flow Coefficient and Work Coefficient Applications

By Mark R. Anderson
Mar 29, 2018

In my last blog, I explored the concept of the flow and work coefficient.  In this blog, I will explore the practical application of the two parameters in machine selection and optimization. 

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Flow Coefficient and Work Coefficient

Flow Coefficient and Work Coefficient

By Mark R. Anderson
Mar 22, 2018

Two often used quantities to characterize turbomachinery are flow coefficient and work coefficient.  The two are generally represented as Φ for flow coefficient and φ for work coefficient.  The...

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Reaction Versus Impulse Type Turbomachinery

Reaction Versus Impulse Type Turbomachinery

By Mark R. Anderson
Mar 8, 2018

The universe of turbomachinery consists of many different design concepts that are radically different from one another. Each class of machine has a particular flow and power range that is best...

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Leveraging Your Legacy Designs

Leveraging Your Legacy Designs

By George C. Zitka, P.E.
Feb 9, 2018

Engineers, by their very nature, like to design new things. To us, there is an undeniable appeal to creating something no one has ever seen before. However, there are compelling reasons to leverage...

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Compressor Design: Influence of the Impeller Exit Blade Angle

Compressor Design: Influence of the Impeller Exit Blade Angle

By Dimitri Deserranno
Jan 19, 2018

During the compressor design process, one of the key optimization steps is to adjust the impeller exit blade angle with the goal of achieving the desired pressure ratio, efficiency and range.   When...

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Getting Something for Nothing – Extending Compressor Operating Range Without an Efficiency Penalty

Getting Something for Nothing – Extending Compressor Operating Range Without an Efficiency Penalty

By George C. Zitka, P.E.
Dec 8, 2017

Can you really get something for nearly nothing? In many cases, a properly-designed compressor casing treatment can extend compressor operating range without having to pay an appreciable efficiency...

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What Next for Wider Flow Range Centrifugal Compressors?

What Next for Wider Flow Range Centrifugal Compressors?

By Dr. Colin Osborne
Sep 21, 2017

Flow range is an essential consideration in the design of any centrifugal compressor system, regardless of the application. Adequate flow range is necessary, not only to assure that various...

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Protecting New Ideas: Navigating the Corporate IP Landscape of Today

Protecting New Ideas: Navigating the Corporate IP Landscape of Today

By Bradley C. Leiser
Sep 1, 2017

An engineer named Victor makes a few final adjustments to his novel radial compressor design just before midnight.  With a deep breath, he clicks the “Save” button and pushes back from his desk. He...

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Shrouded or Open Impellers for Compressor Chillers - That is the Question

Shrouded or Open Impellers for Compressor Chillers - That is the Question

By Steve Kohr
Aug 2, 2017

One of the most important design choices facing a chiller compressor designer is whether to utilize open or shrouded impellers. The impacts of this verdict are wide ranging, which arguably makes this...

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Important Considerations When Designing a Volute

Important Considerations When Designing a Volute

By Jamin Bitter
Jul 26, 2017

When designing a new compressor or pump, most of the focus is put on the impeller and diffuser because they are the elements that are responsible for the work input and its conversion from kinetic...

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Why You Now Need to Learn More about Turbomachinery

Why You Now Need to Learn More about Turbomachinery

By Dr. Nicholas C. Baines
Jul 21, 2017

Once when asked about his priorities, British Prime Minister Tony Blair replied, “Education, education, education.” We can be sure he was not thinking specifically about courses in mechanical...

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Turbomachinery Textbooks Focused on Engineering Design

Turbomachinery Textbooks Focused on Engineering Design

By Barbara Shea
Jul 14, 2017

The vast majority of turbomachinery textbooks emphasize analysis when the heart of engineering is based in design. Concepts NREC is uniquely qualified to share the nature and process of engineering...

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Converting Chiller Compressors to the New Generation of Low GWP Refrigerants

Converting Chiller Compressors to the New Generation of Low GWP Refrigerants

By Dan Hinch
Jun 8, 2017

The chiller industry is under tremendous pressure to convert to new, more environmentally friendly refrigerants.  This change is driven by new global regulations including, the Montreal Protocol and...

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Optimization of Cycle Parameters, Fuel Consumption, and Weight of a Turboshaft Engine Using 1D Design Tools

Optimization of Cycle Parameters, Fuel Consumption, and Weight of a Turboshaft Engine Using 1D Design Tools

By Oleg Dubitsky
Jun 1, 2017

New engine development is a costly endeavor and making the right decisions early in the engine design is extremely important. It requires multi-disciplinary consideration of the engine thermodynamic...

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Using FINE™/Turbo for CFD Analysis in AxCent®

Using FINE™/Turbo for CFD Analysis in AxCent®

By Daryl L. Bonhaus
May 12, 2017

In May of 2016, Concepts NREC and NUMECA International announced a strategic partnership to combine their products to provide a comprehensive turbomachinery design and analysis system. In November of...

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How Manufacturing Methods Impact Performance 3 Examples

How Manufacturing Methods Impact Performance 3 Examples

By Mark R. Anderson
Mar 29, 2017

Some of my other blogs have touched on how important it is to consider manufacturing methods during the design phase. This one will show exactly how manufacturing methods impact performance. We will...

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