EFFECT OF INJECTION PRESSURE ON SPRAY CHARACTERISTICS AND FUEL DISTRIBUTION IN DIESEL ENGINE CONDITIONS BY PLANAR LASER-INDUCED EXCIPLEX FLUORESCENCE (PLIEF) TECHNOLOGY

— The spray characteristic of the injected fuel is mainly depends upon fuel injection pressure, temperature, ambient pressure, fuel viscosity and fuel density. An experimental study was conducted to examine the effect of injection pressure on the spray was injected into direct injection (DI) diesel engine in the atmospheric condition. In Diesel engine, the window of 20 mm diameter hole and the transparent quartz glass materials were used for visualizing spray characteristics of combustion chamber at right angle triangle position. The varying Injection pressure of 180 - 240 bar and the engine was hand cranked for conducting the experiments. Spray characteristics for Jatropha oil methyl ester (JOME) and diesel were studied experimentally. Spray tip penetration and spray cone angle were measured in a combustion chamber of Direct Injection diesel engine by employing high speed Digital camera using Mie Scattering Technique and ImageJ software. The study shows the JOME gives longer spray tip penetration and smaller spray cone angle than those of diesel fuels. The Spray breakup region (Reynolds number, Weber number), Injection velocity and Sauter Mean Diameter (SMD) were determined for diesel and JOME. SMD decreases for JOME than diesel and the Injection velocity, Reynolds Number, Weber Number Increases for JOME than diesel.

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Effect of fuel injection pressure and injection timing on spray characteristics and particulate size–number distribution in a biodiesel fuelled common rail direct injection diesel engine

Applied Energy ◽

10.1016/j.apenergy.2014.05.041 ◽

2014 ◽

Vol 130 ◽

pp. 212-221 ◽

Cited By ~ 105

Author(s):

Avinash Kumar Agarwal ◽

Atul Dhar ◽

Jai Gopal Gupta ◽

Woong Il Kim ◽

Chang Sik Lee ◽

...

Keyword(s):

Diesel Engine ◽

Fuel Injection ◽

Direct Injection ◽

Injection Pressure ◽

Injection Timing ◽

Spray Characteristics ◽

Direct Injection Diesel Engine ◽

Size Number ◽

Particulate Size ◽

Fuel Injection Pressure

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The effect of nozzle diameter, injection pressure and ambient temperature on spray characteristics in diesel engine

Journal of Physics Conference Series ◽

10.1088/1742-6596/822/1/012039 ◽

2017 ◽

Vol 822 ◽

pp. 012039 ◽

Cited By ~ 5

Author(s):

Adiba Rhaodah Andsaler ◽

Amir Khalid ◽

Nor Sharifhatul Adila Abdullah ◽

Azwan Sapit ◽

Norrizam Jaat

Keyword(s):

Diesel Engine ◽

Ambient Temperature ◽

Injection Pressure ◽

Nozzle Diameter ◽

Spray Characteristics

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Potential for Shock-Wave Generation at Diesel Engine Conditions and Its Influence on Spray Characteristics

Energies ◽

10.3390/en13236465 ◽

2020 ◽

Vol 13 (23) ◽

pp. 6465

Author(s):

Weidi Huang ◽

Huifeng Gong ◽

Raditya Hendra Pratama ◽

Seoksu Moon ◽

Keiji Takagi ◽

...

Keyword(s):

Shock Wave ◽

Diesel Engine ◽

Nozzle Exit ◽

Fuel Injection ◽

Injection Pressure ◽

Wave Generation ◽

Contrast Imaging ◽

Spray Characteristics ◽

Supersonic Part ◽

Shock Wave Generation

Increasing the fuel injection pressure is currently the most effective way to achieve a better fuel–air mixing quality in modern engines. Systems capable of delivering fuels at a pressure of over 250 MPa have been widely adopted in diesel engines. At such high injection pressures, the shock-wave generation during fuel injection has been noticed. Investigations can be found widely discussing on how the shock-wave generation during fuel injection would affect the spray dynamics. However, the argument remains whether the shock wave can occur at diesel engine conditions since the diesel engine is operated at very high ambient temperature and density. Even if it could occur, how significantly the spray-induced shock wave affects the spray characteristics is rarely known. To address these concerns, this study was proposed. First, experiments were conducted to obtain the detailed spray dynamics from the nozzle exit to spray downstream field by taking advantage of the X-ray phase-contrast imaging (XPCI) and schlieren imaging techniques. It is found that supersonic and subsonic ligaments coexist in one spray. Increasing the injection pressure or reducing the ambient density would extend the supersonic part in the spray. Multiple shock waves occur subsequently from the nozzle exit, where the spray has the highest local velocity. Shock-wave generation during fuel injection could enhance spray penetration, whereas this effect depends on the length of the supersonic part in the spray. Finally, a diagram was proposed to predict the potential for the shock-wave generation and discuss the possible effect on spray characteristics at diesel engine conditions.

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SPRAY CHARACTERISTICS IN A DIRECT-INJECTION DIESEL ENGINE

Atomization and Sprays ◽

10.1615/atomizspr.v6.i1.50 ◽

1996 ◽

Vol 6 (1) ◽

pp. 95-109 ◽

Cited By ~ 3

Author(s):

H. C. Yang ◽

Hong Sun Ryou ◽

Y. T. Jeong ◽

Young Ki Choi

Keyword(s):

Diesel Engine ◽

Direct Injection ◽

Spray Characteristics ◽

Direct Injection Diesel Engine

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Numerical investigation of injection parameters and piston bowl geometries on emission and thermal performance of DI diesel engine

SN Applied Sciences ◽

10.1007/s42452-021-04633-1 ◽

2021 ◽

Vol 3 (6) ◽

Author(s):

Ikhtedar Husain Rizvi ◽

Rajesh Gupta

Keyword(s):

Diesel Engine ◽

Thermal Performance ◽

Equivalence Ratio ◽

Fuel Injection ◽

Injection Pressure ◽

Injection Nozzle ◽

Piston Bowl ◽

Injection Parameters ◽

Nozzle Size ◽

Engine Emission

AbstractTightening noose on engine emission norms compelled manufacturers globally to design engines with low emission specially NOx and soot without compromising their performance. Amongst various parameters, shape of piston bowls, injection pressure and nozzle diameter are known to have significant influence over the thermal performance and emission emanating from the engine. This paper investigates the combined effect of fuel injection parameters such as pressure at which fuel is injected and the injection nozzle size along with shape of piston bowl on engine emission and performance. Numerical simulation is carried out using one cylinder naturally aspirated diesel engine using AVL FIRE commercial code. Three geometries of piston bowls with different tumble and swirl characteristics are considered while maintaining the volume of piston bowl, compression ratio, engine speed and fuel injected mass constant along with equal number of variations for injection nozzle size and pressures for this analysis. The investigation corroborates that high swirl and large turbulence kinetic energy (TKE) are crucial for better combustion. TKE and equivalence ratio also increased as the injection pressure increases during the injection period, hence, enhances combustion and reduces soot formation. Increase in nozzle diameter produces higher TKE and equivalence ratio, while CO and soot emission are found to be decreasing and NOx formation to be increasing. Further, optimization is carried out for twenty-seven cases created by combining fuel injection parameters and piston bowl geometries. The case D2H1P1 (H1 = 0.2 mm, P1 = 200 bar) found to be an optimum case because of its lowest emission level with slightly better performance.

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Influence of Main Swirler Vane Angle on the Ignition Performance of TeLESS-II Combustor

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4034154 ◽

2016 ◽

Vol 139 (1) ◽

Cited By ~ 10

Author(s):

Bo Wang ◽

Chi Zhang ◽

Yuzhen Lin ◽

Xin Hui ◽

Jibao Li

Keyword(s):

High Speed ◽

Inlet Temperature ◽

Main Stage ◽

Ignition Process ◽

High Speed Camera ◽

Fuel Distribution ◽

Fuel Droplets ◽

Planar Laser ◽

Cfd Method ◽

Vane Angle

In order to balance the low emission and wide stabilization for lean premixed prevaporized (LPP) combustion, the centrally staged layout is preferred in advanced aero-engine combustors. However, compared with the conventional combustor, it is more difficult for the centrally staged combustor to light up as the main stage air layer will prevent the pilot fuel droplets arriving at igniter tip. The goal of the present paper is to study the effect of the main stage air on the ignition of the centrally staged combustor. Two cases of the main swirler vane angle of the TeLESS-II combustor, 20 deg and 30 deg are researched. The ignition results at room inlet temperature and pressure show that the ignition performance of the 30 deg vane angle case is better than that of the 20 deg vane angle case. High-speed camera, planar laser induced fluorescence (PLIF), and computational fluids dynamics (CFD) are used to better understand the ignition results. The high-speed camera has recorded the ignition process, indicated that an initial kernel forms just adjacent the liner wall after the igniter is turned on, the kernel propagates along the radial direction to the combustor center and begins to grow into a big flame, and then it spreads to the exit of the pilot stage, and eventually stabilizes the flame. CFD of the cold flow field coupled with spray field is conducted. A verification of the CFD method has been applied with PLIF measurement, and the simulation results can qualitatively represent the experimental data in terms of fuel distribution. The CFD results show that the radial dimensions of the primary recirculation zone of the two cases are very similar, and the dominant cause of the different ignition results is the vapor distribution of the fuel. The concentration of kerosene vapor of the 30 deg vane angle case is much larger than that of the 20 deg vane angle case close to the igniter tip and along the propagation route of the kernel, therefore, the 30 deg vane angle case has a better ignition performance. For the consideration of the ignition performance, a larger main swirler vane angle of 30 deg is suggested for the better fuel distribution when designing a centrally staged combustor.

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