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Title: Experimental study on diesel spray with single and multiple injection under room temperature and low temperature
Author: Wang, Ziman
ISNI:       0000 0004 5350 7454
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2015
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Multiple-injection strategy can downsize the penetration and boost the atomization, causing higher IMEP and lower emissions. Multiple-injection however is complex, especially under cold condition. The injection characteristics were first studied by applying long-tube measuring instrument. Single and split injection strategies were employed. The flow rate and fuel mass were quantitatively studied. Furthermore, the interaction among splits was linked to dwell interval and injection duration of each split. The influences of temperature were also studied. A microscope and a CCD camera were then employed to study the primary breakup. The regime for the mushroom spray head was analyzed and the dispersion quality was quantified. The breakup-regime study was carried out. Flow regimes in nozzle dominate the breakup. Dwell interval, injection pressure, the number of injections and fuel temperature determined the interaction. The following is the investigation of macroscopic characteristics with high speed imaging technique. The effects of back pressure and the interaction between injections were investigated. The impact of cold fuel temperature was investigated and various correlations were employed to probe the influence of fuel temperature. The velocities and sizes of droplets were finally studied with Phase Doppler Particle Analyzer.
Supervisor: Not available Sponsor: Li Si Guang Scholarship (China Scholarship Council and University of Birmingham)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TJ Mechanical engineering and machinery