For the supercharging of 4-stroke diesel engines the trend is to replace the pulse system with the so-called constant pressure system. Advantages and disadvantages of this latter solution have been dealt with in several publications. However some problems concerning the best matching between engine and charging system seem not to have been thoroughly clarified. Therefore a comparative investigation was carried out at the authors' company on a medium speed engine equipped with pulse and with constant pressure system whereby the turbochargers were in turn optimized for both systems. The investigation included firstly bench tests at constant speed and according to propeller law, where thermal load of exhaust valves was recorded and different configurations of exhaust gas ducts were compared. The second part of the investigation concerned the stability of performance in the course of time and has been carried out on ships whose engines (of the same type as the one tested on the test bench) were converted from the pulse to the constant pressure supercharging system. All the tests made showed that the operating conditions with constant pressure are no worse, but even better, than pulse supercharging so that the former solution can be adopted allowing reduction in construction and maintenance costs.
4-stroke constant pressure supercharged diesel engines: Experimental research and operating results
Betriebsergebnisse mit einem mit Konstantdruck aufgeladenen Viertakt-Dieselmotor
1979
23 Seiten, 14 Bilder
Aufsatz (Konferenz)
Datenträger
Englisch
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