THEORY OF THE LEMPOR EJECTOR
AS APPLIED TO PRODUCE DRAUGHT
IN STEAM LOCOMOTIVES

Summary

This is a revision of the Porta-Taladiz theory of 1957, incorporating the effect of friction in the mixing chamber and other corrections. The theory is based on the principle of conservation of energy as applied by Strahl in 1913, with due corrections for the case under consideration. It serves for the design of an optimum ejector leaving a minimum correction of the blast pipe to be carried out in practice as usual since Stephenson’s times. It serves also to predict the behavior of a given ejector.

As a matter of course, the accuracy of either the calculated or the measured performance of the boiler conditions the optimization of the ejector design. Fortunately there seems to be a reasonable latitude in the dimensions around the optimum.

The Lempor ejector resembles the Le Maître and is thermodynamically equivalent to the Kylpor, the latter resembling the Kylchap. However, its internal losses to friction in the mixing device are smaller.

Successful experiments would show 100% improvement against the best known draughting device.

L.D.Porta
Buenos Aires
December 1974

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