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PROSPECTS FOR A 71,400 BHP DIESEL ENGINE

Gotaverken has developed and tested a two-staged turbo-charging system for slow running two-stroke diesel engines. The new system, called the constant pressure system, consists of an exhaust-gas receiver coupled immediately after the exhaust valves. After the receiver is a H.P. turbo-charger, then a L.P. turbo-charger with another receiver between the two turbines. This way both turbines receive their gas flow at a constant flow. For testing, a three cylinder test engine with a cylinder bore of 750 mm and a piston stroke of 1600 mm was used. Originally designed for an output of 1900 bhp per cylinder, it was tested at 3500 bhp per cylinder at 124 rev/min and a b.m.e.p. of 17.7 bar (18 kg/cm sq.). Output was limited by the scantlings of the crankshaft which limited the safe b.m.e.p. to 17.7 bar and by the cylinder cover bolts which limited firing pressure to 98 bar. Gotverken's next step will most likely be the remodelling of the present test engine from 750 mm to 650 mm to allow higher firing pressure and hopefully a b.m.e.p. of up to 20 kg/cm sq.). The two-staged turbo-charging system as compared to the single stage system has greater power due to the fact that single stage turbo-charger output was limited by its speed. Temperature of combustion space materials is practically the same as today's production engines. The noise level is lowered and the size of air coolers is reduced.