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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation of fuel volatility on the heat transfer dynamics on piston surface due to the pulsed spray impingement
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Investigation of fuel volatility on the heat transfer dynamics on piston surface due to the pulsed spray impingement

机译：脉冲喷射冲击引起的活塞表面传热动力学燃料波动的研究

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The fuel spray in a gasoline direct injection (GDI) engine can impinge on the piston surface to form a liquid film, which leads to a decrease of the combustion efficiency and the increase of particulate emissions. The dynamic heat transfer process resulting from the impingement has an important effect on the evaporation of the liquid film and its residence time. In this study, two pure component fuels (methanol and n-pentane), and three fuel blends with different initial boiling points and enthalpies of vaporization marked as Fuel B, Fuel C and Fuel D, are designed to investigate the effect of the fuel volatility on heat transfer dynamics of pulsed spray impingement with different: injection temperatures (T_(inj)), injection pressures (P_(inj)), piston temperatures (T_(pis)) and injection distances (D_(inj)). The results show that the spray a transient heat transfer induced by different fuel sprays are very sensitive to changes of T_(inj) and D_(inj), and also depend on their boiling points and enthalpies of vaporization. The impinging and cooling intensities are greatly reduced when the pressure ratio of ambient pressure to saturation pressure (P_a/P_(sat)) decreases, as a result of increasing T_(inj). The maximum surface temperature drop (△T_(s, max)) and peak heat flux (q_(max)) on the impinging surface are reduced greatly by over 60% for fuels with low enthalpy of vaporization such as n-pentane, Fuel B, Fuel C and Fuel D, while they are only reduced by less than 15% for methanol with highest enthalpy of vaporization when T_(inj) increases from 25°C to 140°C. Exponential equations are proposed to describe the relationship between q_(max) and P_a/P_(sat). When D_(inj) increases from 50 mm to 70 mm, q_(max) is reduced by over 10% for fuels such as n-pentane, methanol, Fuel B and Fuel C with low initial boiling points, whereas q_(max) is increased slightly by 7% for Fuel D with the highest boiling point. On the other hand, the transient heat transfer of different fuels present similar trends in response to the changes of P_(inj) and T_(pis). △T_(s, max) and q_(max) nearly present a linear variation with P_(inj) and T_(pis) for all fuels.
机译：汽油直喷（GDI）发动机中的燃料喷雾可以撞击活塞表面以形成液体膜，这导致燃烧效率的降低和颗粒排放的增加。由撞击产生的动态传热过程对液体膜的蒸发及其停留时间具有重要作用。在该研究中，两个纯组分燃料（甲醇和正戊烷）和具有不同初始沸点的三个燃料混合物和标记为燃料B，燃料C和燃料D的蒸发焓，设计用于研究燃料挥发性的影响脉冲喷雾冲击的传热动力学与不同：注射温度（T_（inj）），注射压力（P_（inj）），活塞温度（T_（PIS））和喷射距离（d_（inj））。结果表明，喷射由不同燃料喷雾引起的瞬态传热对T_（REN）和D_（RENM）的变化非常敏感，并且还取决于其沸点和蒸发焓。当环境压力与饱和压力的压力比（P_A / P_（SAT））减小时，撞击和冷却强度大大降低，导致T_（REN）增加。撞击表面上的最大表面温度降（△T_（s，max））和峰值热通量（Q_（max））在汽化焓低焓，燃料b等燃料中的燃料减少了60％以上。 ，燃料C和燃料D，虽然当T_（REN）从25℃增加到140℃时，它们仅减少蒸发焓最高的蒸发焓的少于15％。提出指数方程来描述Q_（MAX）和P_A / P_（SAT）之间的关系。当D_（ARM）增加到50 mm至70 mm时，Q_（MAX）减少超过10％的燃料，例如N-戊烷，甲醇，燃料B和具有低初始沸点的燃料C，而Q_（MAX）是燃料D略微增加7％，沸点最高。另一方面，不同燃料的瞬态传热响应于P_（REN）和T_（PIS）的变化存在类似的趋势。 △T_（s，max）和q_（max）几乎呈现了所有燃料的p_（jec）和t_（pis）的线性变化。

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