scholarly journals A Laboratory Investigation into the Fuel Atomization Process in a Diesel Engine for Different Configurations of the Injector Nozzles and Flow Conditions

2020 ◽  
Vol 16 (4) ◽  
pp. 747-760
Author(s):  
Mikhail G. Shatrov ◽  
Valery I. Malchuk ◽  
rey Y. Dunin
Keyword(s):  
Diesel Engine ◽  
Laboratory Investigation ◽  
Flow Conditions ◽  
Atomization Process ◽  
Fuel Atomization

scholarly journals The influence of the injection frequency on the urea selective catalytic reduction systems performance

2017 ◽  
Vol 170 (3) ◽  
pp. 73-77
Author(s):  
Rafał ROGÓŻ ◽  
Piotr JAWORSKI ◽  
Łukasz KAPUSTA ◽  
Andrzej TEODORCZYK
Keyword(s):  
Diesel Engine ◽  
System Performance ◽  
Catalytic Reduction ◽  
Film Formation ◽  
Flow Conditions ◽  
Wall Film ◽  
Injection Frequency ◽  
Crystallization Risk ◽  
Film Characteristics ◽  
Operating Points

This study presents the influence of the UWS injection frequency on a close coupled SCR systems performance. The investigation was performed with the CFD tool AVL Fire. In the paper the analysis of four different UWS injection frequencies in the three different operating points of diesel engine was shown. The assessments of the system performance was referred to the ammonia distribution at catalyst intake and wall film formation inside the investigated geometry, as these are considered as crucial in such a configuration. The results showed that injection frequency affects both factors on different level depending from the flow conditions. In addition, the wall film crystallization risk was discussed basing on the obtained wall film characteristics.

Laboratory Investigation of Rill Erosion on Compost Blankets under Concentrated Flow Conditions

2010 ◽  
Vol 53 (4) ◽  
pp. 1077-1086
Author(s):  
X. Zhu ◽  
L. M. Risse ◽  
S. C. McCutcheon ◽  
E. W. Tollner ◽  
T. C. Rasmussen ◽  
...  
Keyword(s):  
Laboratory Investigation ◽  
Rill Erosion ◽  
Flow Conditions ◽  
Concentrated Flow

Effect of Hardness of Needle-Sealing Surface of Pintle Nozzle on Cavitation Erosion

2011 ◽  
Vol 130-134 ◽  
pp. 946-949
Author(s):  
Heng Zhou Wo ◽  
Ya Fang Zhang ◽  
Xian Guo Hu ◽  
Yu Fu Xu
Keyword(s):  
Diesel Engine ◽  
Cavitation Erosion ◽  
Surface Hardness ◽  
Lower Surface ◽  
Important Influence ◽  
The Other ◽  
Power Performance ◽  
Fuel Atomization ◽  
Heat Treated

Nozzle is one of key parts in the diesel engine. The cavitation erosion of needle-sealing surface in the pintle nozzle has important influence on the fuel atomization, combustion and power performance of diesel engine. In order to investigate the effect of hardness of needle-sealing surface on cavitation erosion, two kinds of nozzles were selected and operated in S195 diesel engine for 10 hours. One nozzle is heat-treated one which has lower surface hardness; the other with higher surface hardness is real commercial nozzle. The surface appearances of original and operated nozzle-sealing surface were observed by SEM. It was found that the cavitation erosion on the seal surface of nozzle with lower hardness was severer than that of nozzle with higher hardness. However, their wear ways and formations are similar.

Understanding of Diesel Engine Combustion Process via Mathematical Modeling: Part 2 — Results

1997 ◽  
Author(s):  
Stanislav N. Danov ◽  
Ashwani K. Gupta
Keyword(s):  
Diesel Engine ◽  
Diffusion Flame ◽  
Numerical Experiments ◽  
Fuel Injection ◽  
Combustion Process ◽  
Gas Mixture ◽  
Vaporization Rate ◽  
Atomization Process ◽  
And Diffusion ◽  
Integral Indicator

Abstract In the companion Part 1 of this two part series paper a mathematical model of combustion process in a diesel engine was presented having both premixed and diffusion flame. The combustion of fuel vaporized during the self-ignition delay period is modeled according to the conditions of premixed flame. A kinetic differential equation has been created for modeling this kind of combustion. The combustion of fuel during the injection process is modeled according to the theory of diffusion flames. This process is strongly influenced by processes of fuel injection, vaporization and diffusion. The atomization process is taken into account by means of the Sauter mean diameter (SMD) of fuel droplets. The instantaneous vaporization rate is defined by the current value of temperature, pressure, concentration of fuel vapors and the mean fuel droplet size in terms of the SMD. The mathematical model includes differential equations describing the processes of fuel injection, vaporization, heat transfer and combustion in both premixed and diffusion flame that occurs in the engine cylinder. The above equations are solved together with the differential equation of the first law of thermodynamics expressing the energy conversion process in the cylinder of diesel engine. The fourth-order Runge-Kutta method is applied for obtaining numerical solution of the system of differential equations. The model is calibrated and validated for two different turbocharged diesel engines — 8DKRN 74/160 and Sulzer-6RLB-66. The analysis is performed on a PC using FORTRAN 90. The comparison between the experimental data and numerical results shows very good agreement. Numerical experiments have been carried out for examining the combustion behavior in the cylinder of a marine DI diesel engine Sulzer 6RLB-66 having a cylinder diameter of 0.66 m bore and stroke of 1.4 m. The influence of the quality of fuel atomization process, estimated via the SMD, on the fuel vaporization rate and overall combustion rate has been evaluated. This influence is quantified and the results show very strong influence of SMD on the vaporization and combustion process, both with respect to the maximum rates and the duration of the processes. In addition numerical experiments have been carried out for determining the effect of duration of fuel injection and the beginning of fuel injection (degrees of crank angle rotation before TDC) on subsequent combustion parameters and integral indicator parameters of the engine. These results show that ratio: “amount of fuel burnt under the premixed flame conditions / amount of fuel burnt under diffusion flame conditions” for one cycle varies significantly with the change in fuel injection duration. The model provides both the instantaneous values of engine parameters in the cylinder (i.e., temperature, pressure, current air-gas mixture composition, heat transfer rate, thermo-physical properties of the air-gas mixture, etc.) and integral indicator engine parameters (mean indicated pressure, specific fuel consumption, efficiency, etc.). A comparison between experimental and modeling data show gratifying results.

scholarly journals Effect of Fuel Mass Flow at the End of Injection on Cavitation and Gas Ingestion in the Nozzle

2020 ◽  
Vol 11 (1) ◽  
pp. 258
Author(s):  
Hua Wen ◽  
Yulong Jiang ◽  
Jinglong Ma
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Internal Flow ◽  
Two Phase ◽  
Fuel Mass ◽  
Experimental Platform ◽  
Fuel Atomization ◽  
Fuel Flow ◽  
Mass Flows ◽  
Framing Camera

The fuel flow in the diesel engine nozzle has a vital impact on the fuel atomization and spray, and the fuel mass flux affects the internal flow of the nozzle. The visual experimental platform for a transparent nozzle was built to obtain the image of fuel flow in a nozzle with a small sac combining the back-light imaging technology and a high-speed framing camera. A two-phase three-component numerical model, based on the OpenFOAM solver, was calculated to quantitatively analyze gas ingestion and cavitation in the nozzle. The results indicate that at the end of injection (EOI), fuel cavitation and external air backflow (gas ingestion) occur successively in the nozzle, and both phenomena first appear in the orifice and then transition to the sac. Cavitation collapse is the major factor of gas ingestion, and the total amount of gas ingestion and cavitation mainly depends on the sac. The outflow of fuel largely depends on the total amount of cavitation and the inertial outflow of fuel at the EOI. The type of cavitation in the nozzle mainly presents annular and bulk cavitation, the former primarily exists in the sac, while the latter is established within the orifice. Therefore, larger mass flows will contribute to stronger cavitation and gas ingestion.

Numerical Simulation on Effect of Nozzle-Hole Layout on Spray Characteristics and Combustion in a DI Diesel Engine

2012 ◽  
Vol 476-478 ◽  
pp. 448-452
Author(s):  
Jun Zhang ◽  
Chang Pu Zhao ◽  
Nai Zhuan Chen ◽  
Da Lu Dong ◽  
Bo Zhong
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Direct Injection ◽  
Combustion Process ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Spray Characteristics ◽  
Fuel Atomization ◽  
Di Diesel Engine ◽  
Nozzle Hole

Diesel spray characteristics are closely related to the combustion of the engine where the spray tip penetration and the fuel atomization play a key role especially for direct injection (DI) diesel engine. With different nozzles, the fuel atomization and evaporation will be different thereby affecting the combustion and emission characteristics. A three-dimensional model is built based on the parameters of a DI diesel engine, and its validation is also validated. Three nozzle-hole layouts are designed in this research, including the conventional hole, multi-hole, and group-hole. The spray characteristics and combustion process are studied with three different nozzle-hole layouts by the way of numerical simulation. Further more, the effect of inter-hole spacing of group-hole nozzle on the evaporation rate and combustion process is researched here.

scholarly journals Residual fuel atomization process simulation

2017 ◽  
Vol 169 (2) ◽  
pp. 108-112
Author(s):  
Oleh KLYUS ◽  
Nadezhda ZAMIATINA
Keyword(s):  
Environmental Performance ◽  
Droplet Diameter ◽  
Combustion Process ◽  
Experimental Studies ◽  
Jet Fuel ◽  
Compression Ignition ◽  
Atomization Process ◽  
Fuel Atomization ◽  
The Mean ◽  
Definition Of

The process of atomization of fuel in engines with compression ignition is determining in organization of the combustion process, the result of which are the economic and environmental performance of the engine. One of the main parameters of the spray jet fuel is the mean droplet diameter. The article presents the results of analytical and experimental studies by the definition of mean diameter of Sauter droplet of atomized residual fuel IFO380.

Sign in / Sign up

Export Citation Format

Share Document