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I calculated thermal penetration depth to 0.5 mm and assumed viscous pd to be similar.
I only estimated gas displacement amplitude which is really not optimal as this is a very important factor because of heat exchanger length!
The length of the engine is typically a fraction (0.5 or 0.25 or 0.125? …) of lambda which is still quite long and I have to experiment further with the feedback loop length/volume.
I increased the length of the coolers because the first ones were only half as long as heater/regenerator just because the heat transfer of the coolers was better.
As far as I know, DeltaEC does not take into account the amplifying resonance effects of the feedback loop and therefore cannot be used to optimize the FBL without additional RPN code.
Carmen Iniesta has written a number of freely available papers on this subject, and I’m not sure whether the RPN modules are in in the DeltaEC code from the book!