Fuel Injection Spray and Combustion Chamber Wall Impingement in Large Bore Diesel Engines

2002 ◽  
Author(s):  
R. Paul Borthwick ◽  
Patrick V. Farrell
Keyword(s):  
Combustion Chamber ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Chamber Wall ◽  
Wall Impingement

An Improved Rate of Heat Release Model for Modern High-Speed Diesel Engines

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Peter G. Dowell ◽  
Sam Akehurst ◽  
Richard D. Burke
Keyword(s):  
Heat Release ◽  
Diesel Engines ◽  
Engine Speed ◽  
Fuel Injection ◽  
Maximum Pressure ◽  
Injection Model ◽  
Wall Impingement ◽  
Small Set ◽  
Rate Of Heat Release ◽  
Engine System

To meet the increasingly stringent emissions standards, diesel engines need to include more active technologies with their associated control systems. Hardware-in-the-loop (HiL) approaches are becoming popular where the engine system is represented as a real-time capable model to allow development of the controller hardware and software without the need for the real engine system. This paper focusses on the engine model required in such approaches. A number of semi-physical, zero-dimensional combustion modeling techniques are enhanced and combined into a complete model, these include—ignition delay, premixed and diffusion combustion and wall impingement. In addition, a fuel injection model was used to provide fuel injection rate from solenoid energizing signals. The model was parameterized using a small set of experimental data from an engine dynamometer test facility and validated against a complete data set covering the full engine speed and torque range. The model was shown to characterize the rate of heat release (RoHR) well over the engine speed and load range. Critically, the wall impingement model improved R2 value for maximum RoHR from 0.89 to 0.96. This was reflected in the model's ability to match both pilot and main combustion phasing, and peak heat release rates derived from measured data. The model predicted indicated mean effective pressure and maximum pressure with R2 values of 0.99 across the engine map. The worst prediction was for the angle of maximum pressure which had an R2 of 0.74. The results demonstrate the predictive ability of the model, with only a small set of empirical data for training—this is a key advantage over conventional methods. The fuel injection model yielded good results for predicted injection quantity (R2 = 0.99) and enabled the use of the RoHR model without the need for measured rate of injection.

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

scholarly journals Injection and Combustion of RME with Water Emulsions in a Diesel Engine

10.14311/1169 ◽  
2010 ◽  
Vol 50 (2) ◽  
Author(s):  
J. Cisek
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Flow Reactor ◽  
Flame Temperature ◽  
Pressure Rise ◽  
Engine Performance ◽  
Exponential Relationship ◽  
Water Fraction

This paper presents ways of using the fully-digitised triggerable AVL VideoScope 513D video system for analysing the injection and combustion inside a diesel engine cylinder fuelled by RME with water emulsions.The research objects were: standard diesel fuel, rapeseed methyl ester (RME) and RME – water emulsions. With the aid of a helical flow reactor, stable emulsions with the water fraction up to 30 % weight were obtained, using an additive to prevent the water from separating out of the emulsion.An investigation was made of the effect of the emulsions on exhaust gas emissions (NOX, CO and HC), particulate matter emissions, smoke and the fuel consumption of a one-cylinder HD diesel engine with direct injection. Additionally, the maximum cylinder pressure rise was calculated from the indicator diagram. The test engine was operated at a constant speed of 1 600 rpm and 4 bar BMEP load conditions. The fuel injection and combustion processes were observed and analysed using endoscopes and a digital camera. The temperature distribution in the combustion chamber was analysed quantitatively using the two-colour method. The injection and combustion phenomena were described and compared.A way to reduce NOX formation in the combustion chamber of diesel engines by adding water in the combustion zone was presented. Evaporating water efficiently lowers the peak flame temperature and the temperature in the post-flame zone. For diesel engines, there is an exponential relationship between NOX emissions and peak combustion temperatures. The energy needed to vaporize the water results in lower peak temperatures of the combusted gases, with a consequent reduction in nitrogen oxide formation. The experimental results show up to 50 % NOX emission reduction with the use of 30% water in an RME emulsion, with unchanged engine performance.

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.

scholarly journals Increasing the efficiency of diesel engines operation by changing the process of fuel injection into the combustion chamber

2021 ◽  
Vol 273 ◽  
pp. 07025
Author(s):  
Igor Ivanov
Keyword(s):  
Problem Solving ◽  
Combustion Chamber ◽  
Fuel Consumption ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Reduce Fuel Consumption ◽  
Constructive Solution

This paper proposes the author’s method of developing a constructive solution for supplying fuel to the combustion chamber to reduce fuel consumption in operation on the basis of TIPS (theory of inventive problem solving).

An Improved Rate of Heat Release Model for Modern High Speed Diesel Engines

2016 ◽  
Author(s):  
Peter G. Dowell ◽  
Sam Akehurst ◽  
Richard D. Burke
Keyword(s):  
Heat Release ◽  
Diesel Engines ◽  
Engine Speed ◽  
Fuel Injection ◽  
Maximum Pressure ◽  
Injection Model ◽  
Wall Impingement ◽  
Small Set ◽  
Rate Of Heat Release ◽  
Engine System

To meet the increasingly stringent emissions standards, Diesel engines need to include more active technologies with their associated control systems. Hardware-in-the-Loop (HiL) approaches are becoming popular when the engine system is represented as a real-time capable model to allow development of the controller hardware and software without the need for the real engine system. This paper focusses on the engine model required in such approaches. A number of semi-physical, zero-dimensional combustion modelling techniques are enhanced and combined into a complete model, these include — ignition delay, pre-mixed and diffusion combustion and wall impingement. In addition, a fuel injection model was used to provide fuel injection rate from solenoid energizing signals. The model was parameterized using a small set of experimental data from an engine dynamometer test facility and validated against a complete data set covering the full engine speed and torque range. The model was shown to characterize Rate of Heat Release (RoHR) well over the engine speed and load range. Critically the wall impingement model improved R2 value for maximum RoHR from 0.89 to 0.96. This reflected in the model’s ability to match both pilot and main combustion phasing, and peak heat release rates derived from measured data. The model predicted indicated mean effective pressure and maximum pressure with R2 values of 0.99 across the engine map. The worst prediction was for the angle of maximum pressure which had an R2 of 0.74. The results demonstrate the predictive ability of the model, with only a small set of empirical data for training — this is a key advantage over conventional methods. The fuel injection model yielded good results for predicted injection quantity (R2 = 0.99), and enables the use of the RoHR model without the need for measured rate of injection.

Improvement of Emissions From Diesel Engines

1988 ◽  
Vol 110 (3) ◽  
pp. 343-348 ◽  
Author(s):  
T. Morimatsu ◽  
T. Okazaki ◽  
T. Furuya ◽  
H. Furukawa
Keyword(s):  
Mass Transfer ◽  
Combustion Chamber ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Air Entrainment ◽  
Injection Timing ◽  
Injection Pump ◽  
High Injection ◽  
High Injection Pressure

It is important to reduce emissions from diesel engines, which are used in the cogeneration systems. The mass transfer to the fuel spray plays various roles in fuel consumption rate and in trace species emission. High injection pressure and a re-entrant combustion chamber were used to make the mass transfer larger. The need for high injection pressure and controlled injection timing for NOx led the authors to use the new Komatsu fuel injection pump. This pump, which has a re-entrant combustion chamber, resulted in clean engine emissions and confirmed the importance of air entrainment to the spray.

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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