Continuing from Part I of this video on Steam Locomotive Drafting Systems, I'm going to show 3 different nozzle designs and discuss the evolution of their development.
If you need to go and watch Part I first, here is the link:
• Explaining Steam Locom...
I'm certainly not going to cover all the aspects of drafting systems in this video, so here are a few resources that you can check out for a more in depth study:
'The fire burns much brighter', by J.J. Koopmans. I was given a copy of this book for my library, and when I first opened it and saw the complicated mathematical equations involved, I closed it back up and decided that even though I might be able to figure them out with careful study, it was not worth the mental strain. However, as research for this video, I reached for it again and found that the first part of the book is more of a historical account of the development of the drafting system, and the heavy technical aspects are in the appendix. I found the historical aspects very fascinating, and the technical parts not too overburdening for someone with experience in fluid dynamics.
advanced-steam.org/books-for-...
'Red Devil and Other Tales from the Age of Steam', by Dave Wardale. This is a fascinating account of how modern engineering concepts were applied to an old steam engine, and should be required reading for anyone interested in modern steam locomotive technology.
The 'Coalition for Sustainable Rail' has produced a White Paper on the Lempor Exhaust:
csrail.org/newsroom/2016/8/29...
The 'Ultimate Steam Page' is all about understanding modern steam locomotive design concepts and applying them to all types of steam locomotives, both large and small:
www.trainweb.org/tusp/
Examination of the resources listed above will demonstrate that there is much more to the design of drafting nozzles than I have covered in this video. I chose to simplify my discussion by choosing only a certain characteristic that I felt was an easy concept to visualize and explore without delving into complicated mathematical formulas. In fact, the discrepancies noted by J.J. Koopmans between results derived by calculations and experimental results would indicate that there is not a person yet who understands these concepts 100%.
My goal is only to generate interest in the subject with the hope that the general steam fan will recognize that there can be significant differences in steam locomotive performance aside from the obvious common attention paid to wheel arrangement and driver size. The fact that I find myself in a unique position of having 3 different nozzle designs in my stewardship inspired me to share this information with those who might not have ever considered how drafting nozzles actually affect performance of the locomotive.
8 фев 2023
