SpinOffs

   

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.

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 -

https://unsplash.com/photos/1NzJggtJ6j4

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.

Practical Application of Multidisciplinary Optimization

by Dr. Peter Weitzman & Steve Kohr on Jul 26, 2019 8:59:39 AM

If you design turbomachinery for a living, you are already doing multidisciplinary optimization (MDO), regardless of whether you have a special software tool with MDO built in or not. Turbomachines, by their nature, require advanced fluid dynamics as well as very high mechanical complexity.  Whenever you make a trade-off between performance and durability or performance and weight/inertia, you are doing an MDO study. Adding MDO software to your traditional design approaches can give you additional insight into the trade-offs, and save you time by avoiding the need for manual iteration.

Entropy Happens… Deal with It!

by Francis A. Di Bella, P.E. on Jul 19, 2019 9:09:00 AM

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, no doubt created by some engineering professor who doesn’t see that the glass is half full, but that it has a safety factor of 2! Nevertheless, the bumper sticker stated the obvious when one thinks about it: ENTROPY HAPPENS! And then, to emphasize the point, the artist has the letters slowly “evaporating,” demonstrating graphically that entropy proceeds from order to chaos.

I recently got back from my favorite annual conference: ASME’s Turbo Expo. This year, someone thought it would be a good idea to hold it in Phoenix, Arizona…in the summertime.  While that’s not the choice I would have made, I did enjoy the conference very much and thought it was well worth attending. 

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

by Francis A. Di Bella, P.E. on Jun 28, 2019 10:07:50 AM

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 continuous transformation of energy from a heat energy source to produce mechanical or electrical power must contend with components that operate in a cycle. The key word here being “continuous”. The combustion of any carbon-hydrogen bond material (i.e., fossil fuels), or the liberation of heat energy from any number of materials when placed in a piston-cylinder, would not be very useful if the piston is not returned to its initial “precombustion” position. It is literally the difference between the one-time launching of an object from the cylinder or the continuous production of rotary shaft power; power that can be used to propel a vehicle forward or turn an electric generator. It is the cyclic operation of the fluid in the thermodynamic cycle that enables heat engines and refrigeration cycles to provide continuous power, or cooling, that is needed for the safety, security, comfort and all the other “hierarchy of needs” that was so well formulated by the renowned humanist psychologist, Dr. Abraham Maslow.

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