Lempor ejector

The Lempor ejector is a steam locomotive exhaust system developed by noted Argentine locomotive engineer Livio Dante Porta. The ejector's name is a portmanteau of the names of Porta and Belgian locomotive engineer Maurice Lemaître. The Lempor ejector follows the principles of the de Laval nozzle.[1]

Victorian Railways R class locomotive R 711 was equipped with dual Lempor exhausts in 1998 (since removed).

Operation

In a steam locomotive, draft is produced in the firebox by exhausting the steam coming from the cylinders into the Chimney via a nozzle or 'blast pipe' this creates a vacuum in the Smokebox. The Lempor ejector is a development of similar multiple orifice/nozzle ejectors which create either a stronger vacuum or the same vacuum more efficiently by presenting less 'back pressure' or resistance to the exhausting cylinder.

Results

The Lempor exhaust is claimed to deliver a 100% improvement in draughting capacity over traditional exhaust systems and a 40% increase in ejector performance.[2]

References
  1. "A Primer on the Lempor Exhaust". csrail.org. Coalition for Sustainable Rail. August 30, 2016. Retrieved March 4, 2023.
  2. "Theory of the Lempor Ejector as Applied to Produce Draught in Steam Locomotives".


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