FRENCH COMPOUND LOCOMOTIVES' HOMEPAGE
The KylChap; Patents #622.123 & #626.276 - 8/21/1926. Copies available from the I.N.P.I.
Basically, it is made by stacking of four different nozzles, the first one blowing exhaust steam only and called "primary nozzle", a Chapelon designed item of a very particular shape generating as few as possible back pressure dividing the steam flow into four jets, followed by a Kylälä designed nozzle in which a first steam/combustion gases mix occurs, followed by another Chapelon designed nozzle where a second combustion gases suction/mix process occurs, followed by a "classical" chimney bell type of nozzle, forming the last suction and mixing point.
As usual, a larger version of each drawing can be seen by clicking the picture.
|The Kylälä nozzle
It's the "second stage" of the KylChap blasting (literal translation of French technical word for this part of a Marc Seguin's based design - I mean multiple smoketubes - of steam generator is exhaust, that's why I use it quite often and erroneously. Sorry.) Steam is "blown" in it by a first nozzle containing four triangular shaped blades . Drawings of it to come soon, but it can already be seen, not very clearly, in the drawing below.
Drawing: 39.4 K .gif file.
The full KylChap
Here you may immediately perceive one of the basic ideas of Chapelon about efficient blasting systems that is the necessity of multiples suction points and/or the necessity of a progressive, multi-points mixing of fluids (have a look at a drawing of a good injector), here we have 3 different suction points conveniently well vertically spaced in front of the tubes plate. The version shown here is the final one, called 1K/1C used in single, dual (called 1K/1C-1K/1C and not 2K/2C as often read) or triple (242 A 1) paralleled configurations according to the capacity and to the quantity of steam to be produced by the boiler. Relative positions and proportions of the various nozzles, independently of general dimensions, proven to be absolutely critical parameters to obtain an efficient KylChap, as are their perfect concentricity and alignment (precision for "would be" KylChap modellers). Also note the four vital blades in the topmost Chapelon nozzle.
The triple KylChap of 242 A 1
The three basics paralleled KylChaps shown here being cut along three different vertical axis, most details are visible...
A very rarely shown drawing:
The "Super KylChap"
Fully annotated sketch by the hand of the master, unique opportunity to improve your technical french! But I can also help you a bit saying that Tuyère(s)=Ajutage(s)= nozzle(s)...
Mélange gazeux= gases mix.
Explanation of improvements awaited by Chapelon with this design is also on hand, currently under translation. Will come.
Briefly, the major difference, not very visible on this sketch is the addition of a second Kylälä nozzle above the Chapelon tuyère resulting in a fourth suction/mixing point.
Chapelon never tried to experiment with it, saying "... Difficulties to gain agreements to give solid form to highly valuables projects are already so hard, I don't want to fight again for such a minor idea."
Comparison of the KylChap with almost every other existing systems. You will even find graphs concerning some major foreign locomotives, U.S. and others. At least one curve concerning the LEMAITRE blasting device, used as the basis of the LEMPOR system, I'll someday add a few lines about the latest... Vacuum figures are not converted, because I really don't know what is the most used unit internationnaly. A brief mail about it will be welcome! A part of the text has yet to be translated. Of course, click on the sheet for a large readable version.
To be continued...
1997, 98, 99, 2000 by T. Stora. All rights reserved. Reproduction, translation, total or partial on any media absolutely forbidden without preliminary permission and agreement. Copyright 1997, 98, 99, 2000 by T. Stora