An Interesting Attempt to Extract the Utmost Possible Heat From the Steam
The British “Ljungstrom” Locomotive, showing its massive proportion and its many interesting external features.
CONSIDERABLE interest has been aroused by tests made between Derby and Manchester by the LMS Railway of a “Ljungstrom” turbo-
The new locomotive is 74 ft in length over buffers, and in working order weighs 143 tons 14 cwt. It consists of two vehicles, the first carrying the boiler and the second the turbine and condenser. The former is carried on three fixed axles and a leading sliding-
The boiler is of the ordinary locomotive type, having a Belpaire firebox and steel inner firebox with steel stays. It has an outside diameter of 6 ft and contains 238 2½-
Tubes: 1,480 sq ft.
Firebox: 140 sq ft.
Superheater: 640 sq ft.
Total: 2,260 sq ft.
The grate area is 30 sq ft.
Access to the boiler tubes is facilitated by the front portion of the smoke box, wherein is the preheater, being set up on hinges.
The boiler and turbine are connected by ordinary piping, a ball-
At the rear of the boiler-
The second vehicle takes the place of the tender to the usual locomotive and has three pairs of coupled driving wheels, 5 ft 3-
View showing the front of the locomotive.
The main turbine is of the axial flow type and capable of developing 2,000 hp at 10,000 revs per minute, the equivalent engine speed being 70 miles per hour. Flexible couplings link the turbine with the main gearing.
The condenser immediately behind the turbine is of the “Ljungstrom” patent air-
The capacity of the main condenser body is roughly 1,350 gallons of water, and the boiler is fed from this by two turbine-
In conclusion, braking is effected on the locomotive by a steam and hand-
It is interesting to note that this locomotive is at present engaged in passenger service between Derby and Birmingham, and will shortly be running express trains between Manchester, Derby and London.
The thermal efficiency of the steam locomotive is low on account of the large amount of heat that goes to waste by way of the chimney. The great possibilities of the turbo-
Among these engines may be mentioned the “Reid-
In Germany also a good deal of experimental work has been carried out in regard to this type of engine. In 1924 Messrs. Krupp constructed at their Essen Works a turbine locomotive embodying many interesting features, and for this engine a reduction of 20 per cent, in fuel consumption was claimed. More recently, Messrs. J. A. Maffei of Munich constructed a turbine engine on somewhat similar lines to the Krupp locomotive. This engine, which was designed to develop 2,500 hp and to have a maximum speed of approximately 75 miles per hour, underwent extensive trials last year on the Bavarian section of the German State Railways.
[From The Meccano Magazine, July 1927]
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