A comprehensive experimental investigation on the PFI spray impingement: Effect of impingement geometry, cross-flow and wall temperature. (August 2019)

• Record Type: Journal Article
• Authors: Li, Yaoting; Huang, Yongcheng; Yang, Shangsheng; Luo, Kun; Chen, Rixin; Tang, Chenglong
• Is Part Of: Applied thermal engineering. Volume 159(2019)
• Publication Date: 2019-08
• Subjects: Port fuel injection -- Spray impingement -- Cross-flow -- Wall temperature -- Spray tip penetration -- Impinged spray height; PN particle number -- PFI port fuel injection -- GDI gasoline direct injection -- PDI port and direct injection -- S spray tip penetration -- Hw impinged spray height -- Lw impingement distance -- θw impingement angle -- Uc cross-flow velocity -- Tw wall temperature -- ASOI after start of injection; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2019.113848
• Languages: English
• ISSNs: 1359-4311

Abstract

Abstract: In this work, an experimental study on the effects of the impingement geometry, the cross-flow intensity and the wall temperature on the characteristics of an impinging port fuel injection (PFI) spray was conducted. The transient development of the impinging spray was recorded by a high-speed camera with Mie scattering. Based on the high-speed images, the spray tip penetration ( S ) and the impinged spray height ( Hw ) were obtained. The results show that with the increase of the impingement distance ( Lw ), S increases and Hw decreases at the same time after the impingement. As the impingement angle ( θw ) increases, S decreases while Hw first increases and then decreases. With the increase of the cross-flow velocity ( Uc ), less part of the spray impinges onto the wall, and S significantly increases. As the wall temperature ( Tw ) rises, S does not show much variation. However, Hw increases gently for Tw lower than 420 K, and it increases sharply for Tw higher than 420 K due to the Leidenfrost mechanism. The effects of the above factors ( Lw, θw, Uc, Tw ) on S and Hw were finally evaluated and compared through the introduction of a contribution index.