Discharge coefficients for a diesel injector during cold starting conditions

• Published in: Atomization and Sprays
• Main Authors: Vergnes, Célia, Foucher, Fabrice, Mounaïm-Rousselle, Christine
• Other Authors: Laboratoire pluridisciplinaire de recherche en ingénierie des systèmes, mécanique et énergétique (PRISME), Université d'Orléans (UO)-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2009
• Subjects: ACM; [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment; Arctic; Nozzle; The Nozzle
• Online Access: https://hal.archives-ouvertes.fr/hal-00618045; https://doi.org/10.1615/AtomizSpr.v19.i7.20

International audience Most studies of sprays produced from diesel injectors are performed at "usual" ambient temperature. These studies focus on spray development and the impact of flow inside the injector nozzles. Various mechanisms can produce initial perturbations of the jet and depend on nozzle geometry--the cavitation phenomenon through the nozzle hole is one of these. Until recently, only a few studies have examined spray development for cold temperature conditions (i.e., below 273 K). The objective of this study is to provide data regarding the phenomena occurring in a diesel fuel jet above temperature conditions, representative of a cold start for a direct-injection compression ignition engine. In this study, the discharge coefficient has been estimated by performing experiments inside a climatic chamber, from 253 to 293 K, for three different fuels, namely, n-heptane, decane, and arctic diesel fuel.