Ultra-high speed imaging study of the diesel spray close to the injector tip at the initial opening stage with single injection

Wang, Ziman; Ding, Haichun; Ma, Xiao; Xu, Hongming; Wyszyński, Miroslaw L.

doi:10.1016/j.apenergy.2015.12.046

Cited by 42 publications

(20 citation statements)

References 15 publications

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“…mm downstream, the spray shows similar density to liquid fuel. The overall developing trend is similar to the trend of diesel spray, as reported in literature [16,17] where the tested fuel was diesel. The main difference is that no mushroom shaped head can be observed in present study.…”

Section: Resultssupporting

confidence: 85%

Microscopic characterization of isooctane spray in the near field under flash boiling condition

Wang

Jiang

et al. 2016

Applied Energy

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Section: Resultssupporting

confidence: 85%

Microscopic characterization of isooctane spray in the near field under flash boiling condition

Wang

Jiang

et al. 2016

Applied Energy

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“…However, the primary break-up in the diesel spray has always been ignored because of the dense fuel density in the near-nozzle field (region of primary break-up). It is difficult to visualize the dense spray field using conventional optics methods even though some methods have been used to analyze the primary break-up [18][19][20][21]. Therefore, the breakup process is not well understood for high-pressure diesel injection.…”

mentioning

confidence: 99%

Experimental study on the effect of nozzle hole-to-hole angle on the near-field spray of diesel injector using fast X-ray phase-contrast imaging

Zhang

Moon

Gao

et al. 2016

Fuel

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Fuel atomization and vaporization process play a critical role in determining the engine combustion and emission. The primary near-nozzle breakup is the vital link between the fuel emerging from the nozzle and the fully atomized spray. In this study, the near-nozzle spray characteristics of diesel injectors with different umbrella angle (UA) were investigated using fast X-ray phase-contrast imaging and quantitative image processing. A classic "dumbbell" profile of spray width (SW) composed of three stages: opening stage, semisteady stage and closing stage. The SW peaks of two-hole injectors were more than twice of that of single-hole

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“…ディーゼル機関において熱効率の向上や排気物質の低減のため，燃料噴霧特性の詳細な理解に基づく燃焼の適切な制御が求められている．燃料噴霧の基礎的な情報として，噴霧先端到達距離や噴霧角等の噴霧形状については多くの研究成果が報告されている．燃料噴霧は時間的な非定常性が強く，空間的にも不均一であることから，噴霧内部における噴霧液滴を評価する必要がある．噴霧下流の燃料噴霧については，噴霧液滴が十分に拡散し，比較的計測が容易であることから，PDPA (Wang et al, 2016a)や PIV (Zama et al, 2012)により計測された液滴の速度分布や粒径分布が報告されている．噴孔近傍の噴霧については液滴が非常に密集しているため比較的計測が容易ではないものの，Crua らは長距離顕微鏡を用いて噴孔近傍の噴霧外縁部の噴霧液滴の速度および粒径分布を計測している (Crua et al, 2015)．また Moon らは X 線位相コントラスト法 (XPCI: X-ray Phase Contrast Imaging) を用い *1 正員，長崎大学工学研究科（〒852-8521 長崎県長崎市文教町 1-14） *2 いすゞ自動車（株）（〒252-0881 神奈川県藤沢市土棚 8） *3 （株）いすゞ中央研究所 E-mail of corresponding author: komada@nagasaki-u.ac.jp ることで，噴孔近傍噴霧のラインオブサイト特性に基づく画像を取得しており，その画像を解析することで噴霧の速度分布や粒径分布を計測している (Moon et al, 2014)．燃料噴霧は下流に向かって広がり拡散することから噴霧の分散過程が重要であり，噴霧角から分散を評価した結果が報告されている (Payri et al, 2016) (Naber and Siebers, 1996)．また，Wang らは微小な時間に噴射された燃料の質量と噴霧画像における噴霧断面積の増加量の間のつりあいから噴霧質量の分散を評価している (Wang et al, 2016b Fig. 1 Fuel spray measurement system.…”

Section: まえがきunclassified

Dispersion of spray droplets near diesel fuel injector nozzle

Komada

Kawaharada

Udagawa

et al. 2017

Transactions of the JSME (In Japanese)

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A laser 2-focus velocimeter (L2F) was used for measurements of velocity, size and number density of droplets in diesel sprays injected into the atmosphere by using 8-hole injector nozzle. The diameter of the nozzle orifice was 0.112mm. The injection pressure was set at 65MPa. The droplets dispersion model which can estimate the number density by using the spray width and the droplet velocity was proposed. It was shown that the velocity of droplets at the spray center region was higher than the one at spray periphery region in the middle period of injection duration. The size of droplets at the spray center region was larger than the one at the spray periphery region. The number density of droplets was high at the region between the spray center and the spray periphery. The number density estimated by the droplets dispersion model was nearly same as the one evaluated by L2F measurement at the spray center region in the middle period of injection duration. It is understood that the number density was decided by the dispersion due to the changes of the spray width and the spray velocity at the center region in the middle period of injection duration.

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Ultra-high speed imaging study of the diesel spray close to the injector tip at the initial opening stage with single injection

Cited by 42 publications

References 15 publications

Microscopic characterization of isooctane spray in the near field under flash boiling condition

Microscopic characterization of isooctane spray in the near field under flash boiling condition

Experimental study on the effect of nozzle hole-to-hole angle on the near-field spray of diesel injector using fast X-ray phase-contrast imaging

Dispersion of spray droplets near diesel fuel injector nozzle

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