Behavior of Adhering Fuel on Cold Combustion Chamber Wall in Direct Injection Diesel Engines

1986 ◽  
Author(s):  
H. Tsunemoto ◽  
T. Yamada ◽  
H. Ishitani
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Direct Injection ◽  
Chamber Wall

Combustion chamber wall influences on the vaporisation, mixture formation and combustion in DI diesel engines with a small combustion chamber

MTZ worldwide ◽  
2002 ◽  
Vol 63 (9) ◽  
pp. 26-30
Author(s):  
Christian Fettes ◽  
Tilo Schulze ◽  
Alfred Leipertz ◽  
Hans Zellbeck ◽  
Detlev Potz
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Chamber Wall ◽  
Mixture Formation

Thermo-swing insulation to reduce heat loss from the combustion chamber wall of a diesel engine

2019 ◽  
Vol 20 (7) ◽  
pp. 805-816 ◽  
Author(s):  
Akio Kawaguchi ◽  
Yoshifumi Wakisaka ◽  
Naoki Nishikawa ◽  
Hidemasa Kosaka ◽  
Hideo Yamashita ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Combustion Chamber ◽  
Heat Loss ◽  
Diesel Engines ◽  
Chamber Wall ◽  
Gas Temperature ◽  
Gasoline Engines ◽  
Air Heating ◽  
Developed Surface ◽  
Insulation Coating

Cooling heat loss is one of the most dominant losses among the various engine losses to be reduced. Although many attempts to reduce it by insulating the combustion chamber wall have been carried out, most of them have not been successful. Charge air heating by the constantly high temperature insulating wall is a significant issue, because it deteriorates charging efficiency, increases the emissions of soot and NOx in diesel engines, and promotes the knock occurrence tendency in gasoline engines. A new concept heat insulation methodology which can reduce cooling heat loss without heating the charging air has been developed. Surface temperature of insulation coating on the combustion chamber wall changes rapidly, according to the quickly changing in-cylinder gas temperature in each engine stroke. During the compression and expansion stroke, the surface temperature of the insulation coating goes up rapidly, and consequently, the heat transfer becomes lower by the reduced temperature difference between the surface and the gas. During the intake stroke, the surface temperature goes down rapidly, and it prevents intake air heating from the wall. To realize the above-mentioned functionality, a thin coating layer with low thermal conductivity and low heat capacity was developed. It was applied on the pistons of diesel engines, and showed improvement in thermal efficiency. It also showed a reduction of unburnt fuel emission in low temperature engine starting condition. The energy balance analysis showed reduction of cooling heat loss and, on the contrary, increase in the brake power and the exhaust loss.

Combustion chamber resonances in direct injection automotive diesel engines: A numerical approach

2004 ◽  
Vol 5 (1) ◽  
pp. 83-91 ◽  
Author(s):  
A. J. Torregrosa ◽  
A Broatch ◽  
X Margot ◽  
V Marant ◽  
Y Beauge
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Direct Injection ◽  
Numerical Approach

Penetration and Vaporization of Diesel Fuel Sprays

1969 ◽  
Vol 184 (10) ◽  
pp. 147-170 ◽  
Author(s):  
R. Burt ◽  
K. A. Troth
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Direct Injection ◽  
Combustion Process ◽  
Major Effect ◽  
Engine Fuel ◽  
Liquid Droplets ◽  
Fuel Sprays ◽  
Air Movement ◽  
Air Mixing

In the diesel engine, fuel is injected into the hot, compressed air in the combustion chamber. Thus the process of diesel combustion is essentially inhomogeneous, and the mixing of the fuel and air in the combustion chamber dominates the whole combustion process. Since fuel–air mixing is so important the distribution of the injected fuel has a major effect on combustion performance. This is particularly true of direct-injection diesel engines which have relatively low rates of air movement. In all diesel engines, fuel is injected into the combustion chamber at high pressure through small nozzles. The high-velocity liquid jet atomizes, after emerging from the nozzle, into a spray of liquid droplets. The penetration, distribution, and vaporization of the sprays, together with the air movement, govern the mixing of fuel and air. The penetration of fuel sprays is dealt with in Part 1 of the paper; Part 2 describes a study of the vaporization of fuel sprays.

Combustion chamber wall influences on the vaporisation, mixture formation and combustion in DI diesel engines with a small combustion chamber

MTZ worldwide ◽  
2002 ◽  
Vol 63 (7-8) ◽  
pp. 35-38
Author(s):  
Christian Fettes ◽  
Tilo Schulze ◽  
Alfred Leipertz ◽  
Hans Zellbeck ◽  
Detlev Potz
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Chamber Wall ◽  
Mixture Formation
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