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Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i4.30
pages 339-355

EXPERIMENTAL STUDY ON SPRAY AND MIXTURE PROPERTIES OF THE GROUP-HOLE NOZZLE FOR DIRECT-INJECTION DIESEL ENGINES, PART II: EFFECTS OF INCLUDED ANGLE AND INTERVAL BETWEEN ORIFICES

Keiya Nishida
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
Jian Gao
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan
Yuhei Matsumoto
Department of Mechanical System Engineering, University of Hiroshima, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan

RESUMO

The research reported in this article is an experimental investigation on the effects of nozzle specifications on spray and mixture properties of the group-hole nozzle by varying the included angle and interval between orifices. Since the group-hole nozzle spray loses its axisymmetry in the divergent angle and large interval cases, the original ultraviolet-visible laser absorption-scattering (LAS) imaging technique was first extended to simultaneous measurement of the total masses, as well as the mass distributions of vapor/liquid phases per projection area perpendicular to the laser beam in a nonaxisymmetric evaporating spray. Two major aspects of group-hole nozzle specifications have been investigated in this work. The results suggest that: (1) Increasing the divergent angle between orifices results in shorter spray tip penetration, larger spray cone angle, and significant increase in mass of fuel vapor, indicating the evaporation improvement. (2) In the case of group-hole nozzle with relatively large interval between orifices used in this study, the decreased penetration, larger spray cone angle, and reduced mass ratio of fuel vapor can be found. It is considered to be contributed to by the combined effect of direct droplets collision in the overlapping part of the two jets and the droplets collision and coalescence in the stagnation region inside the fuel spray.


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SPRAY CHARACTERISTICS OF A GROUP-HOLE NOZZLE FOR DIRECT-INJECTION DIESEL ENGINES
Atomization and Sprays, Vol.16, 2006, issue 1
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EXPERIMENTAL STUDY ON SPRAY AND MIXTURE PROPERTIES OF THE GROUP-HOLE NOZZLE FOR DIRECT-INJECTION DIESEL ENGINES, PART I: A COMPARATIVE ANALYSIS WITH THE SINGLE-HOLE NOZZLE
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EXPERIMENTAL STUDY ON VELOCITY DISTRIBUTION OF POSTIMPINGEMENT DIESEL SPRAY ON A WALL. PART 1: EFFECT OF IMPINGEMENT ANGLE ON FLOW PATTERN
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