scholarly journals Secondary drop breakup in the deformation regime

1992 ◽  
Author(s):  
L.-P. HSIANG ◽  
G. FAETH
Keyword(s):  
Drop Breakup ◽  
Deformation Regime ◽  
Secondary Drop

Temporal properties of secondary drop breakup in the bag-stamen breakup regime

2013 ◽  
Vol 25 (5) ◽  
pp. 054102 ◽  
Author(s):  
Hui Zhao ◽  
Hai-Feng Liu ◽  
Jian-Liang Xu ◽  
Wei-Feng Li ◽  
Kuang-Fei Lin
Keyword(s):  
Drop Breakup ◽  
Temporal Properties ◽  
Secondary Drop

Secondary-Drop-Breakup Simulation Integrated With Fuel-Breakup Simulation Near Injector Outlet

2011 ◽  
Vol 133 (8) ◽  
Author(s):  
Eiji Ishii ◽  
Masanori Ishikawa ◽  
Yoshihiro Sukegawa ◽  
Hiroshi Yamada
Keyword(s):  
Liquid Film ◽  
Particle Method ◽  
Liquid Films ◽  
Fuel Spray ◽  
Fuel Injector ◽  
Drop Breakup ◽  
Free Surfaces ◽  
Collision Type ◽  
Automobile Engines ◽  
Secondary Drop

The fuel spray of an injector for automobile engines contains multiscale free surfaces: liquid films formed at the fuel-injector outlet, ligaments generated by liquid-film breakup, and droplets generated from the ligaments within the secondary-drop-breakup region. To simulate these multiscale free surfaces, we developed a method that combines two types of simulation. The liquid-film breakup near the injector outlet was simulated by using a particle method, and the secondary-drop breakup after the liquid-film breakup was simulated by using a discrete droplet model (DDM). The injection conditions of DDM were the distributions of droplet diameters and velocities calculated in the liquid-film-breakup simulation. We applied our method to simulate the spray from a collision-type fuel injector. The simulated liquid-film breakup near the injector outlet and behavior of the secondary-drop breakup qualitatively agreed with measurements. Furthermore, the errors of the mean droplet diameters between the simulations and the measurements were less than 12%. This shows that our method is effective for fuel spray simulation.

SECONDARY DROP BREAKUP IN SWIRL ATOMIZERS

2002 ◽  
Vol 12 (5-6) ◽  
pp. 615-628
Author(s):  
Yuriy Khavkin
Keyword(s):  
Drop Breakup ◽  
Secondary Drop

Short Spray Penetration for Direct Injection Gasoline Engines With Secondary-Drop-Breakup Simulation Integrated With Fuel-Breakup Simulation

2014 ◽  
Vol 136 (9) ◽  
Author(s):  
Eiji Ishii ◽  
Hideharu Ehara ◽  
Motoyuki Abe ◽  
Toru Ishikawa
Keyword(s):  
High Speed ◽  
Direct Injection ◽  
Grid Method ◽  
Liquid Column ◽  
Fuel Spray ◽  
Drop Breakup ◽  
Spray Penetration ◽  
Fuel Injectors ◽  
Gasoline Engines ◽  
Secondary Drop

Direct injection gasoline engines have both better engine power and fuel efficiency than port injection gasoline engines. However, direct injection gasoline engines also emit more particulate matter (PM) than port injection gasoline engines do. To decrease PM, fuel injectors with short spray penetration are required. More effective fuel injectors can be preliminarily designed by numerically simulating fuel spray. We previously developed a fuel-spray simulation. Both the fuel flow within the flow paths of an injector and the liquid column at the injector outlet were simulated by using a grid method. The liquid-column breakup was simulated by using a particle method. The motion of droplets within the air/fuel mixture (secondary-drop-breakup) region was calculated by using a discrete droplet model (DDM). In this study, we applied our fuel-spray simulation to sprays for the direct injection gasoline engines. Simulated spray penetrations agreed relatively well with measured spray penetrations. Velocity distributions at the outlet of three kinds of nozzles were plotted by using a histogram, and the relationship between the velocity distributions and spray penetrations was studied. We found that shrinking the high-speed region and making the velocity-distribution uniform were required for short spray penetration.

scholarly journals A numerical investigation on impulse-induced nonlinear longitudinal waves in pantographic beams

2021 ◽  
pp. 108128652110108
Author(s):  
Emilio Turco ◽  
Emilio Barchiesi ◽  
Francesco dell’Isola
Keyword(s):  
Numerical Simulations ◽  
Mechanical Response ◽  
Integration Scheme ◽  
Present Contribution ◽  
Longitudinal Waves ◽  
Deformation Regime ◽  
Impulsive Loads ◽  
Unit Cells ◽  
Statics And Dynamics ◽  
Equations Of Motions

This contribution presents the results of a campaign of numerical simulations aimed at better understanding the propagation of longitudinal waves in pantographic beams within the large-deformation regime. Initially, we recall the key features of a Lagrangian discrete spring model, which was introduced in previous works and that was tested extensively as capable of accurately forecasting the mechanical response of structures based on the pantographic motif, both in statics and dynamics. Successively, a stepwise integration scheme used to solve equations of motions is briefly discussed. The key content of the present contribution concerns the thorough presentation of some selected numerical simulations, which focus in particular on the propagation of stretch profiles induced by impulsive loads. The study takes into account different tests, by varying the number of unit cells, i.e., the total length of the system, spring stiffnesses, the shape of the impulse, as well as its properties such as duration and peak amplitude, and boundary conditions. Some conjectures about the form of traveling waves are formulated, to be confirmed by both further numerical simulations and analytical investigations.

An Early Miocene Transition in deformation regime within the Red River Fault Zone, Yunnan, And its significance for Indo-Asian tectonics

1992 ◽  
Vol 97 (B5) ◽  
pp. 7159 ◽  
Author(s):  
T. Mark Harrison ◽  
Chen Wenji ◽  
P. H. Leloup ◽  
F. J. Ryerson ◽  
Paul Tapponnier
Keyword(s):  
Fault Zone ◽  
Red River ◽  
Early Miocene ◽  
Deformation Regime ◽  
Red River Fault
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