Technology and Operations
This forum is for discussing technological & operational matters pertaining to U-boats.
Re: U-boat diesel fuel consumption
Posted by:
Theo Horsten
()
Date: August 24, 2006 05:13PM
Yes, the example for the 2-stroke is a low speed diesel. The U-boats all had 4-stroke engines, therefore the example of the 2-stroke was merely to compare the consumption between 2 and 4 stroke.
A pressure of 500 bar or abt. 7300 psi is normal for a fuelpump of a marine diesel. Pressures in the injectors run as high as 8800 psi. Mind you: in the U-boat days.
Pressure in modern common rail systems runs as high as 1600 bar or 23500 psi.
The Jumo 205 had 2 fuelpumps and 4 nozzles per cilinder. it wasn't very well suited for combat, but on the transatlantic flights between Europe and South America it was used for, it was a wonderful engine. The consumption at cruising altitude was just over 161g/hp/hr, so still coming close to the consumption of a 2-stroke marine diesel.
Supercharged and running at full load, developing 1000 hp, the consumption was about 167g/hp/hr.
The injection pressure was 8000 psi or the normal 550 bar. After 800 hours of service the fuelpumps needed an overhaul.
.
A pressure of 500 bar or abt. 7300 psi is normal for a fuelpump of a marine diesel. Pressures in the injectors run as high as 8800 psi. Mind you: in the U-boat days.
Pressure in modern common rail systems runs as high as 1600 bar or 23500 psi.
The Jumo 205 had 2 fuelpumps and 4 nozzles per cilinder. it wasn't very well suited for combat, but on the transatlantic flights between Europe and South America it was used for, it was a wonderful engine. The consumption at cruising altitude was just over 161g/hp/hr, so still coming close to the consumption of a 2-stroke marine diesel.
Supercharged and running at full load, developing 1000 hp, the consumption was about 167g/hp/hr.
The injection pressure was 8000 psi or the normal 550 bar. After 800 hours of service the fuelpumps needed an overhaul.
.
