Lempor ejector

Steam locomotive exhaust system

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

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]

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]^{[citation needed]}

References

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