Numerical Study on Wall Impingement and Film Formation in Direct-Injection Spark-Ignition Condition

2020 ◽  
Author(s):  
Junghyun Kim ◽  
Jongwon Chung ◽  
Woojae Kim ◽  
Kyoungdoug Min
Keyword(s):  
Numerical Study ◽  
Film Formation ◽  
Direct Injection ◽  
Spark Ignition ◽  
Ignition Condition ◽  
Wall Impingement ◽  
Direct Injection Spark Ignition

Numerical study of plasma produced ozone assisted combustion in a direct injection spark ignition methanol engine

Energy ◽  
2018 ◽  
Vol 153 ◽  
pp. 1028-1037 ◽  
Author(s):  
Changming Gong ◽  
Jiawei Yu ◽  
Kang Wang ◽  
Jiajun Liu ◽  
Wei Huang ◽  
...  
Keyword(s):  
Numerical Study ◽  
Direct Injection ◽  
Spark Ignition ◽  
Direct Injection Spark Ignition

Experimental and Numerical Study of Abnormal Combustion in Direct Injection Spark Ignition Engines Using Conventional and Alternative Fuels

2019 ◽  
Vol 33 (6) ◽  
pp. 5230-5242 ◽  
Author(s):  
Tamara Ottenwälder ◽  
Ultan Burke ◽  
Fabian Hoppe ◽  
Oguz Budak ◽  
Sascha Brammertz ◽  
...  
Keyword(s):  
Alternative Fuels ◽  
Numerical Study ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engines ◽  
Direct Injection Spark Ignition

Spray Development and Wall Impingement of Ethanol and Gasoline in an Optical Direct Injection Spark Ignition Engine

2015 ◽  
Author(s):  
Mohammad Fatouraie ◽  
Margaret S. Wooldridge ◽  
Benjamin R. Petersen ◽  
Steven T. Wooldridge
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Coolant Temperature ◽  
Absolute Pressure ◽  
Injection Timing ◽  
Cylinder Wall ◽  
Wall Impingement ◽  
Direct Injection Spark Ignition

The effects of ethanol on spray development and wall impingement of a direct injection spark ignition (DISI) engine was investigated using high-speed imaging of the fuel spray in an optically-accessible engine. Neat anhydrous ethanol (E100), reference grade gasoline (E0) and a 50% blend (by volume) of gasoline and ethanol (E50) were used in the study. The experiments were conducted using continuous firing conditions for an intake manifold absolute pressure of 57 kPA, and engine speed of 1500 RPM. Retarded fuel injection timing was used (with start of injection at 250 °bTDC) to isolate the effects of cylinder wall impingement, and lean fuel-to-air ratios (ϕ=0.8–0.9) were used to minimize sooting and coating of the transparent cylinder liner. The effects of three engine coolant temperatures (25, 60 and 90 °C) and two fuel rail pressures (100 and 150 bar) on the features of the spray and the spray interaction with the wall were studied for the different fuels. Quantitative metrics were defined to analyze the spatial features of the spray related to wall impingement. Gasoline (E0) sprays exhibited higher sensitivity to coolant temperature compared to ethanol (E100) in terms of the shape of the spray and wall impingement. Higher fuel injection pressure increased the spray tip penetration rate and fuel impingement with the wall for E0 and E100, despite creating wider plume angles of the fuel sprays.

A numerical–experimental assessment of wall impingement models for spark-ignition direct-injection engines

2019 ◽  
Vol 21 (2) ◽  
pp. 281-301
Author(s):  
Ronald O Grover ◽  
Todd D Fansler ◽  
Andreas Lippert ◽  
Michael C Drake ◽  
Dennis N Assanis
Keyword(s):  
Light Transmission ◽  
Film Formation ◽  
Direct Injection ◽  
Spark Ignition ◽  
Mie Scattering ◽  
Quantitative Agreement ◽  
Atmospheric Conditions ◽  
Direct Injection Engines ◽  
Wall Impingement ◽  
Film Area

Liquid wall impingement in direct-injection engines can cause soot and hydrocarbon emissions as well as reduced combustion efficiency. This study focuses on detailed evaluations of numerical droplet impingement criteria that govern the onset of splash. The five selected splash criteria, which all extrapolate from single-droplet impacts to full sprays, are representative of those currently in use for spark-ignition direct-injection engines. The computations examined the sensitivity of impinging spray simulations to the splash criteria for a high-pressure, direct-injection swirl spray under atmospheric conditions impinging at a 45° angle onto a flat plate. The numerical results were compared to an unusually extensive set of experimental data: Mie scattering and light transmission imaging, plus quantitative refractive index matching measurements of the fuel film area and thickness, and phase Doppler interferometry measurements of droplet size and velocity near the plate. Good qualitative and at least fair quantitative agreement was obtained for the global spray impingement and wall film formation, especially for single-drop criteria that include the effect of viscosity. The film area and shape were insensitive to the splash criteria, illustrating the importance of film thickness measurements for validating simulations. The results also revealed the sensitivity of impingement calculations to droplet arrival frequency when that is taken into account. In general, the comparisons indicated the need to capture the effect of multiple droplets impinging on the wall at irregular frequencies in the criterion, as well as other important physics of the droplet–wall interaction that may mask the true effect of the impingement criterion.

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