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首页> 外文期刊>Fuel >Experimental study on the diesel and biodiesel spray characteristics emerging from equilateral triangular orifice under real diesel engine operation conditions
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Experimental study on the diesel and biodiesel spray characteristics emerging from equilateral triangular orifice under real diesel engine operation conditions

机译：实际柴油机工况下等边三角形节流孔产生的柴油和生物柴油喷雾特性的实验研究

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The triangular spray has a potential to accelerate air-fuel mixing rate and undergo axis-switching during the injection process, which both are beneficial for improving the atomization quality. This paper presents an experimental investigation on the macro-spray characteristics and the mechanism of axis-switching with diesel and biodiesel emerging from equilateral triangular orifice of diesel nozzle, by using shadowgraph technique, under various injection pressures (50 MPa, 70 MPa, 90 MPa) and backpressures (1 MPa, 2 MPa, 3 MPa). Two CCD cameras were set to capture the macro spray images at the minor and major view planes simultaneously. Macro spray characteristics values were processed from the spray images in different view planes by MATLAB. The results indicated that the spray width of biodiesel was larger than that of diesel at all conditions from all view planes. In addition, both diesel and biodiesel emerging from equilateral triangular orifice underwent axis-switching during the spray progress even under the typical diesel engine operation conditions. Moreover, the difference of equilateral triangular spray widths between minor plane and major plane decreases as the backpressure increases for both fuels, it is expected that the increasing of backpressure enhances the aerodynamic effects, resulting in inhibiting the spray axis-switching. Furthermore, the difference of diesel spray widths between the major plane and minor plane was much higher than that of biodiesel. Because the higher surface tension and viscosity of biodiesel can cause smaller surface-instabilities and also resist the spray deformation, which are conductive to suppress the biodiesel spray axis-switching, and thus ultimately lead to narrowing the difference of biodiesel spray widths between minor plane and major plane. Finally, the spray tip penetration of biodiesel was consistent longer than that of diesel, while the spray cone angle of biodiesel was smaller than that of diesel, and also there was an interaction between major and minor view planes for diesel spray cone angle values at the backpressure of 1 MPa, but it didn't happen for biodiesel during the whole injection process. The present results indicated that the diesel spray was much easier to undergo axis-switching. The higher probability of axis-switching, larger spray cone angle and spray width of diesel demonstrated better air-fuel mixing quality than biodiesel.
机译：三角形喷雾具有在喷射过程中加速空气-燃料混合速率并进行轴切换的潜力，这两者均有利于提高雾化质量。本文通过阴影图技术，在各种喷射压力（50 MPa，70 MPa，90 MPa）下，通过阴影图技术，对从柴油喷嘴等边三角形孔口出来的柴油和生物柴油的宏观喷雾特性以及轴切换机理进行了实验研究。 ）和背压（1 MPa，2 MPa，3 MPa）。设置了两个CCD摄像机，以同时在副视平面和主视平面捕获宏观喷雾图像。通过MATLAB从不同视角的喷雾图像处理宏观喷雾特性值。结果表明，从所有观察平面看，在所有条件下，生物柴油的喷雾宽度均大于柴油的喷雾宽度。此外，即使在典型的柴油机运行条件下，在喷雾过程中，从等边三角形孔流出的柴油和生物柴油也会进行轴切换。此外，两种燃料的背压增加时，副平面和主平面之间的等边三角形喷雾宽度的差减小，预期背压的增加会增强空气动力学效果，从而抑制喷雾轴线切换。此外，主平面和副平面之间柴油喷雾宽度的差异远高于生物柴油。由于较高的生物柴油表面张力和粘度可以导致较小的表面不稳定性，并且还可以抵抗喷雾变形，因此有利于抑制生物柴油喷雾轴的切换，从而最终缩小了生物柴油喷雾宽度与小平面之间的差异。大飞机。最后，生物柴油的喷嘴尖端穿透持续时间长于柴油，而生物柴油的喷雾锥角小于柴油，并且在主视平​​面和次视平面之间，柴油的锥角值也存在相互作用。 1 MPa的背压，但在整个注射过程中生物柴油都没有发生。目前的结果表明，柴油喷雾更容易进行轴切换。与生物柴油相比，轴切换的可能性更高，柴油的喷雾锥角更大和喷雾宽度更大，证明了空燃混合质量更好。

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