Designing Ruled Surfaces for Flank Milling

by Peter Klein on Mar 15, 2019 10:21:00 AM

As discussed in my previous blog post, Flank Milling, How Hard Can it Be?, turbomachinery blades are commonly designed as ruled surfaces, with the goal of making manufacturing easier and faster with flank-milling.  While some non-ruled surfaces can be acceptably flank-milled, the programming and machining process for flank-milling is generally more dependable with ruled data. However, the ruled data should be well conditioned, and several pitfalls should be avoided during the design and construction process.

Phase Change - Make Mine a Double!

by Mark R. Anderson on Feb 22, 2019 10:40:06 AM

As I’ve always said, there’s as much thermodynamics in a glass of beer, as there is in a power plant. Don't believe me? Read on. Phase change is common phenomena that we see all the time.  We’re most familiar with H2O, of course, in its various forms: ice, water, and steam. This is partly because it’s a very common substance (on Earth anyway) but also because it’s one of the rare fluid types that readily changes phase at temperatures and pressures humans can typically dwell in. 


Back to Beer...

Material Properties  - What Really Matters?

by Kevin Fairman on Nov 9, 2018 10:36:00 AM

As an engineer in the rotating machinery world, it is my job to design things that work for a very long time. To help ensure this, we have evolved the best analytical tools to calculate the stresses and deflection of the parts we have so carefully designed. But sometimes, we lose track of what matters. We know that material strength, weight, stiffness, toughness, thermal conductivity and thermal growth all matter. They are in a material database, so they must.

Designing Turbomachinery is like Solving a Rubik's Cube

by Barbara Shea on Sep 21, 2018 10:01:00 AM

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 shape, it changes the aerodynamics, and could impact manufacturability. Everything you change has a cascading effect across many different areas, because all of the areas are linked; just like a Rubik's® cube! Only, in turbomachinery design, you are not always trying to get all of the sides to be one color. Heck, even a 3-year old can do that

Design Tradeoffs and Compromises in Integrally Geared Turbomachinery

by Andrew Provo on Jul 21, 2017 10:14:08 AM

When designing turbomachines, the quality of the final product can often be improved by implementing a holistic approach to the engineering process. As with many complex mechanical systems there are a significant number of competing requirements that impact the overall success of the system. By fully understanding the nature of these compromises, and how the various subsystems interact, the design will be improved. This interplay is particularly noticeable in the design of integrally geared (IG) turbomachinery.

How Manufacturing Methods Impact Performance 3 Examples

by Mark R. Anderson on Mar 29, 2017 1:54:42 PM

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 look at three different radial compressor designs to demonstrate the effects of different parameterizations needed for different manufacturing methods. These designs cover a fairly broad range of pressure ratio, Mach number, and Reynolds number. The table below shows some properties of the stages and figures shows the three dimensional shapes.

Design Elements that Affect Machining Time in Turbomachinery

by Mark R. Anderson on Mar 9, 2017 2:55:26 PM

The primary options for laying out an impeller (i.e. flank milled versus point milled, open versus covered impellers, integral versus welded shrouds) determine the basic manufacturing process (see Manufacturing Methods Used for Turbomachinery for more info).  Beyond the basic layout, there are several other details of the design that can significantly affect manufacturability. They include: 

ASME’s Turbo Expo technical conference is THE industry event for bringing together experts from around the world to talk about the latest innovations in turbine technology.  Last year’s event in Seoul, was no exception. Our experts, including Dr. David Japikse, CEO and Founder; Peter Klein, Director of CAM Software and Associate Corporate Fellow, Mark Anderson, Chief Technology Officer, and Eric Krivitzky were there to present three papers.

Previous | Next