Lemaître exhaust
Encyclopedia
The Lemaître exhaust is a type of Steam locomotive exhaust system
developed by the Belgian
engineer Jean Lemaître
.
with 5 nozzles in a circular pattern exhausting up a large-diameter chimney stack, with a variable area nozzle exhausting up the centre, and improved efficiency by about 10%.
on his new locomotive designs for the Southern Railway
, namely the Merchant Navy
, Light Pacific and Q1 classes. Bulleid also retro-fitted Lemaître exhausts on some older classes, such as the SR Lord Nelson class
and some of the SR V Schools class.
, who created the Lempor
and Lemprex
, named after a combination of their two names.
Steam locomotive exhaust system
The Steam locomotive exhaust system consists of those parts of a steam locomotive which together discharge exhaust steam from the cylinders in order to increase the draught through the fire...
developed by the Belgian
Belgium
Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...
engineer Jean Lemaître
Jean Lemaître
Jean Lemaître was a mechanical engineer from the Nord Belge Railway, who developed a Steam locomotive exhaust system.The Lemaître Exhaust featured 5 nozzles in a circular pattern exhausting up a large-diameter stack, with a variable area nozzle exhausting up the center, and improved efficiency by...
.
Construction
The Lemaître exhaust featured a blastpipeBlastpipe
The blastpipe is part of the exhaust system of a steam locomotive that discharges exhaust steam from the cylinders into the smokebox beneath the chimney in order to increase the draught through the fire.- History :...
with 5 nozzles in a circular pattern exhausting up a large-diameter chimney stack, with a variable area nozzle exhausting up the centre, and improved efficiency by about 10%.
Uses
The Lemaître exhaust was used extensively in Great Britain by OVS BulleidOliver Bulleid
Oliver Vaughan Snell Bulleid was a British railway and mechanical engineer best known as the Chief Mechanical Engineer of the Southern Railway between 1937 and the 1948 nationalisation, developing many well-known locomotives.- Early life and Great Northern Railway :He was born in Invercargill,...
on his new locomotive designs for the Southern Railway
Southern Railway (Great Britain)
The Southern Railway was a British railway company established in the 1923 Grouping. It linked London with the Channel ports, South West England, South coast resorts and Kent...
, namely the Merchant Navy
SR Merchant Navy class
The SR Merchant Navy class , was a class of air-smoothed 4-6-2 Pacific steam locomotives designed for the Southern Railway of the United Kingdom by Oliver Bulleid...
, Light Pacific and Q1 classes. Bulleid also retro-fitted Lemaître exhausts on some older classes, such as the SR Lord Nelson class
SR Lord Nelson Class
The SR class LN or Lord Nelson class is a type of 4-cylinder 4-6-0 steam locomotive designed for the Southern Railway by Richard Maunsell in 1926. They were intended for Continental boat trains between London and Dover harbour, but were also later used for express passenger work to the South-West...
and some of the SR V Schools class.
Further Development
The design was later improved by Livio Dante PortaLivio Dante Porta
Livio Dante Porta was an Argentine steam locomotive engineer. He is particularly remembered for his innovative modifications to existing locomotive systems in order to obtain higher performance, energy efficiency and reduced pollution. He developed the Kylpor and Lempor exhaust systems...
, who created the Lempor
Lempor ejector
The Lempor ejector is a Steam locomotive exhaust system developed by noted Argentine locomotive engineer Livio Dante Porta. In a steam locomotive, draft is produced in the firebox by exhausting the steam coming from the cylinders out of the chimney, or also by a blower. The LemPor exhaust delivers...
and Lemprex
Lemprex ejector
A Lemprex ejector is a type of Steam locomotive exhaust system developed by noted Argentinian locomotive engineer Livio Dante Porta . In a steam locomotive, draft is produced in the firebox by exhausting the steam coming from the cylinders out the chimney. The Lemprex exhaust will deliver improved...
, named after a combination of their two names.