每年出版 12 期
ISSN 打印: 1044-5110
ISSN 在线: 1936-2684
Indexed in
FORMATION AND DEVELOPMENT OF WALL LIQUID FILMS DURING IMPACTION OF GASOLINE FUEL SPRAYS
摘要
Laser-induced fluorescence (LIF) measurements and model predictions of the liquid film thickness formed on a flat surface during impingement of fuel sprays formed from low-pressure gasoline injectors are reported. The obtained measurements guide the development of a mathematical model employed to numerically predict the formation and transport of the wall liquid film. The governing film flow equations are based on the continuous Eulerian approach and are formulated according to the thin-film boundary layer framework. Extended parametric studies investigate the sensitivity of the model to different type and order of spatial and temporal discretization schemes. Governing parameters for the spray representation and wall impingement process are addressed, and their influence upon the behavior of the fuel film development is investigated. Droplet impact pressure is identified as the main driving force of the film transport process, as revealed through an order-of-magnitude analysis on the terms considered in momentum conservation equations. Model parameters defining the characteristics of the incident fuel droplets are additionally proved influential. Predictions under different injection conditions are compared against the temporal evolution of liquid film thickness at various locations over the impact wall. The numerical results capture the wavy variation of film thickness during the fuel film formation and transport along the solid surface from the time of impingement until equilibrium conditions have been reached. The latter is achieved at the final stages of mass exchange with the impinging jet, and it is well reproduced, although a tendency to under predict the peak thickness values during the initial and more transient stages of the formation process is revealed.
-
Fansler Todd D, Parrish Scott E, Spray measurement technology: a review, Measurement Science and Technology, 26, 1, 2015. Crossref
-
Kay E. D., Hibberd S., Power H., Non-isothermal rimming flow with the effects of surface shear and droplet impact, Physics of Fluids, 27, 12, 2015. Crossref
-
Frapolli Nicolò, Boulouchos Konstantinos, Wright Yuri M., Geiler Jan N., Manz Andreas, Kaiser Sebastian A., Large Eddy Simulations and Tracer-LIF Diagnostics of Wall Film Dynamics in an Optically Accessible GDI Research Engine, SAE Technical Paper Series, 1, 2019. Crossref
-
Hoyne Alexander C., Nath Chandra, Kapoor Shiv G., Characterization of Fluid Film Produced by an Atomization-Based Cutting Fluid Spray System During Machining, Journal of Manufacturing Science and Engineering, 135, 5, 2013. Crossref