Development and Application of a Drop-wall Interaction Model at High Ambient Pressure Conditions

Document Type

Article

Publication Date

2022

Publisher

Begell House

Source Publication

Atomization and Sprays

Source ISSN

1044-5110

Original Item ID

DOI: 10.1615/AtomizSpr.2022038549

Abstract

This paper focuses on developing and applying a drop-wall interaction model for high ambient pressure conditions. In an internal combustion engine, the high-speed fuel spray can impinge on the piston surface, particularly for early injection and cold start. Drop-wall interactions can cause a wall film that adversely affects combustion and emissions performance. The present drop-wall model is derived from the numerical results obtained using the smoothed particle hydrodynamics (SPH) method, a high-fidelity method for simulating fluid flows. The current model is comprehensive as it considers the effects of wall temperature and ambient pressure. The model predicts four different impact outcomes (i.e., deposition, rebound, contact splash, and film splash) for dry wall impact, and two impact outcomes (i.e., deposition and splash) for wet wall impact. The model provides the mass distribution of the resulting wall film and secondary droplets, the latter with proper velocities. The present model was used to simulate diesel spray-wall interactions in a high-pressure constant-volume chamber. Various operating conditions were simulated, including different injection pressures and ambient densities. Predicted spray patterns and droplet distributions were compared with the experimental data. Good levels of agreement were obtained. With its ability to consider the effects of wall temperature and ambient pressure, the present model has the potential to predict drop-wall interactions accurately at extreme conditions.

Comments

Atomization and Sprays, Vol. 32, No. 4 (2022): 1-23. DOI.

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