Investigation on Fuel Spray and Injection Characteristics of Mini P-Size Pintle Nozzle and its Low Inertia Injector for Small IDI Diesel Engines

1997 ◽  
Vol 24 (4-6) ◽  
pp. 884-892
Author(s):  
Dong Yao-Qing
Keyword(s):  
Diesel Engines ◽  
Fuel Spray

419 Effect of Cavity Entrance Shape on Fuel Spray & Emission in Small DI Diesel Engines

2000 ◽  
Vol 2000.40 (0) ◽  
pp. 174-175
Author(s):  
Koji TSUKAMOTO ◽  
R. M. MONTAJIR ◽  
Hideyuki TSUNEMOTO ◽  
Hiromi ISHITANI
Keyword(s):  
Diesel Engines ◽  
Fuel Spray

Investigation of Fuel Spray Propagation, Combustion and Soot Formation/Oxidation in a Single Cylinder Medium Speed Diesel Engine

2012 ◽  
Author(s):  
Fridolin Unfug ◽  
Uwe Wagner ◽  
Kai W. Beck ◽  
Juergen Pfeil ◽  
Ulf Waldenmaier ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
High Speed ◽  
Liquid Fuel ◽  
Combustion Process ◽  
Fuel Spray ◽  
Soot Concentration ◽  
Single Cylinder ◽  
Medium Speed ◽  
532 Nm

To fulfil strict emission regulations and the need for higher efficiency of future Diesel engines require an optimized combustion process. Optical investigations represent a powerful tool for getting a better understanding of the ongoing processes. For medium speed Diesel engines, optical investigations are relatively rare or not available. The “Institut für Kolbenmaschinen” (IFKM) and MAN Diesel & Turbo SE performed extensive optical in-situ investigations of the injection and combustion process of a MAN 32/44 CR single cylinder medium speed Diesel engine that provide previously unavailable insights into the ongoing processes. The optical investigations aimed on fuel spray visualization, high-speed soot luminescence measurement and two colour pyrometry applied for five combustion chamber regions. To apply the optical measurement techniques, two optical accesses were designed. Access no. 1 is placed near the cylinder liner. Access no. 2 is located close to the injector in a 46° angle to the cylinder vertical axis. An insert was used which consists of an illumination port and a visualization endoscope. Additionally some special nozzle designs were used beside the standard nozzle, which have one separated nozzle hole. This enables a simultaneous view from both optical accesses on the same flame cone. For Mie-Scattering investigation a pulsed Nd:YAG-Laser with 532 nm wavelength was used for illumination and a CCD-camera with an upstream 532 nm optical filter was used for visualization. This combination allows observing the liquid fuel distribution even after start of combustion. Penetration depth of liquid fuel spray was analysed for different swirl numbers, intake manifold pressures, injection timings and injection pressures. High-speed flame visualization was done by two CMOS cameras which were mounted at two different optical accesses with view on the same flame cone. Due to this application a simultaneous measurement of the flame distribution of two different views was possible. This enables a 3-dimensional investigation of the flame propagation process. In addition, the advanced two colour pyrometry was applied for five different regions of the same flame cone. Due to a calibration after each measurement the absolute radiant flux can be calculated and thus the absolute temperature and soot concentration. With this procedure it was possible to give a real temperature and soot concentration distribution of the flame cone. To provide more detailed information about the combustion process, selected engine operation points were simulated with a modified version of the CFD code KIVA3v-Release2 at the IFKM. The simulated results were compared to the measured data.

Fuel Spray-Air Motion Interaction in DI Diesel Engines: A Review

1993 ◽  
Author(s):  
S. K. Singal ◽  
B. P. Pundir ◽  
P. S. Mehta
Keyword(s):  
Diesel Engines ◽  
Fuel Spray ◽  
Air Motion

The Influence of Pressure in the Nozzle Sac and Needle Lift on Fuel Spray Behavior and HC Emissions in DI Diesel Engines

1999 ◽  
Author(s):  
H. Tsunemoto ◽  
R. M. Montajir ◽  
H. Ishitani ◽  
T. Hayashi ◽  
D. Harai
Keyword(s):  
Diesel Engines ◽  
Fuel Spray ◽  
Hc Emissions

Study on the Fuel Spray and Combustion of the Variable Orifice Nozzle (VON) for Direct Injection Diesel Engines

2000 ◽  
Author(s):  
Toshiyuki Hasegawa ◽  
Hayato Maehara ◽  
Ryosuke Tanishige ◽  
Takao Iwasaki ◽  
Takashi Kobayashi ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Direct Injection ◽  
Fuel Spray

Numerical Investigation on Primary Atomization of the Fuel Spray in Diesel Engines

2012 ◽  
Vol 516-517 ◽  
pp. 634-637
Author(s):  
Zhi Xia He ◽  
Li Li Tian ◽  
Ju Yan Liu
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Numerical Investigation ◽  
Diesel Engines ◽  
Fuel Spray ◽  
New Model ◽  
Turbulence Flow ◽  
Primary Breakup ◽  
Simulation Results ◽  
Breakup Model

In addition to the aerodynamic effects, turbulence and cavitation play an important role on the primary atomization. Different spray breakup models were analysized and evaluated though simulation of spray with them and then a new model of coupling the nozzle cavitating and turbulence flow to the spray primary breakup was put forward. The numerical simulation results with all these different spray primary breakup models were comparied with the experimental data and then the new model were proved to be much better. The study may effectively help establish the accurate spray breakup model.

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