Improving the Efficiency of Supercritical CO2 Power Systems

by Francis A. Di Bella, P.E. on Apr 27, 2017 8:35:39 AM

The contemporary gas turbine engine, developed in the 1940’s by Sir Frank Whittle (pictured), is still considered to be among the most efficient, external combustion engines. Today, there is a resurgent interest in power generation technology driven by humankind’s insatiable need for more power. A popular focus is to extend the Brayton Cycle, the thermodynamic basis for a gas turbine engine, to using CO2 in a closed Brayton Cycle. This is commonly referred to as a Supercritical CO2 (sCO2) system. As the name implies, the CO2 is at pressures above the critical point of CO2 or 1,070 psia. The highest pressure in the cycle can often be designed to be 4 times this pressure and operate at temperatures as high as 700°C at the inlet to the turbine. 

Turbocharger Market – Is There Room for Growth?

by Dr. Nicholas C. Baines on Apr 20, 2017 1:19:51 PM

The recent announcement that Bosch Mahle Turbosystems is up for sale demonstrates just how difficult it is to succeed in the mainstream turbo market that is already served by very well established OEMs. It’s hard to see that they did anything wrong. They were funded by two very large companies, they had a very large lead customer, a realistic timescale to profitability, and an early presence in China.

Topics: Turbochargers

The Challenges of Testing Turboshaft Engines with Dynamometers

by Jim Henry on Apr 13, 2017 5:12:21 PM

The testing of turboshaft engines is necessary to ensure that post-repair performance meets or exceeds requirements for safe aircraft operation.  Testing typically involves several phases such as:  seal break-in; transient response; performance check and control system validation.  Dynamometers are used to simulate the load imposed during operation during testing.

Arbitrary blade section profiling is an essential part of designing high performance axial turbines and compressors. In most cases such blade section models are formed by hybrid use of arbitrary curves and blade section parameters, such as blade angles, chord, sizing of edges, wedge angles etc. Hybrid blade section models deliver to the design  process  both convenience and flexibility of controlling section geometry.

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.

Throughflow Modeling: An Overview

by Morgan Williams on Mar 22, 2017 4:08:25 PM

This Blog post gives a brief outline of the throughflow method for turbomachinery flows and presents the calculated performance results of a Single-Stage Axial-Flow Compressor validation.

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: 

Thanks to early pioneering efforts by Dr. David Japikse and his team, Concepts NREC has been at the forefront of turbomachinery design optimization for the past 15 years.

Manufacturing Methods Used for Turbomachinery

by Mark R. Anderson on Feb 22, 2017 12:42:53 PM

There are two dominant manufacturing methods used to produce turbomachinery parts – Casting and 5-axis machining. This blog will explore some of the applications and restrictions of these two methods.

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