Comments on: NORA: a way to control NOx emissions produced by combustion http://www.car-engineer.com/nora-way-control-nox-emissions-produced-combustion/ The website dedicated to automotive engineering Thu, 26 Dec 2013 21:28:15 +0000 hourly 1 http://wordpress.org/?v=3.8 By: Romain Nicolas http://www.car-engineer.com/nora-way-control-nox-emissions-produced-combustion/#comment-4391 Sun, 22 Dec 2013 21:48:27 +0000 http://www.car-engineer.com/?p=5926#comment-4391 Very good questions!
It is generic in the way that it can be used for several types of fuel, in several shapes of combustion chamber with several injection patterns.
For the second question, I didn’t try out the tool, but like any modeling tool, accuracy is always better in steady conditions. We know that NOx are mostly formed during transient phases, so I guess that the originators of the tool have focused on these conditions.

]]> By: Roshan Jayachandran http://www.car-engineer.com/nora-way-control-nox-emissions-produced-combustion/#comment-4373 Thu, 19 Dec 2013 03:45:29 +0000 http://www.car-engineer.com/?p=5926#comment-4373 Two questions come to mind;
When you say that the tool is generic, in what way is it so?
And if the tool is an accurate predictor of the NOx formation process, does it hold good for transient operations of the engine as well, or is accuracy only assured in steady state operating points.?

Unless these questions are answered with high certainty, I don’t believe this tool could be used industrially to gain test bench time. My reasoning for this being that even when your tool is generic, you still need to validate its results, and unless the tool provides a reasonable accuracy over transients, it may not reduce project length it cost by a large enough margin for OEMs to adopt it as part of their calibration process.

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