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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of nozzle configuration on flash boiling fuel sprays of twin-orifice nozzle with aviation kerosene
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Effects of nozzle configuration on flash boiling fuel sprays of twin-orifice nozzle with aviation kerosene

机译：喷嘴配置对双孔喷嘴闪蒸燃烧燃料喷涂的影响

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摘要

To investigate the effects of nozzle configuration on flash boiling fuel sprays of the twin-orifice nozzle with aviation kerosene, five different two-dimensional transparent slit nozzles with various orifices' diameter ratio and expansion chamber's aspect ratio are fabricated and studied. Both internal two-phase flow and near-nozzle fuel jet under subcooled and superheated conditions are studied via a high-speed camera with backlit measurement and image processing methods. The experimental results indicate that the bubbles nucleation from cavitation at the inlet-orifice wall can accumulate within the expansion chamber with enhanced bubble growth and aggregation under higher-level superheated conditions, which can significantly promote the fuel atomization and evaporation. In addition, a smaller orifices' diameter ratio leads to larger in-nozzle bubble volumes within the twin-orifice nozzle, while the internal bubble inception may be inhibited by increasing the expansion chamber's aspect ratio. Furthermore, decreasing the orifices' diameter ratio can promote the flash boiling process, while better-quality spray at flare flash boiling state may be facilitated by the near-nozzle mechanical breakup. The nozzle with a lower expansion chamber's aspect ratio has a larger spray cone angle and weaker jet instability, benefited from larger bubble volume and higher effective bubble rate, which accelerates the bubble disruption and fulfills the potential of in-nozzle flash boiling on near-nozzle jet disintegration.
机译：为了研究喷嘴配置对具有航空煤油的双孔喷嘴的闪蒸沸腾燃料喷雾的影响，制造和研究了具有各种孔径比和膨胀室纵横比的五种不同的二维透明狭缝喷嘴。通过高速相机研究了过冷和过热条件下的内部两相流量和近喷嘴燃料射流，具有背光测量和图像处理方法。实验结果表明，从入口孔壁上的空化气体成核，可以在膨胀室内积聚在膨胀室内，在更高水平的过热条件下具有增强的泡沫生长和聚集，这可以显着促进燃料雾化和蒸发。另外，较小的孔口直径比导致双孔喷嘴内的较大的喷嘴气泡体积，而可以通过增加膨胀室的纵横比来抑制内部气泡初始。此外，降低孔口的直径比可以促进闪蒸沸腾过程，而近喷嘴机械分散可以促进闪光沸腾状态下的更好质量的喷雾。具有较低膨胀室纵横比的喷嘴具有更大的喷雾锥角和较弱的射流不稳定性，受益于较大的气泡体积和更高的有效气泡速率，这加速了气泡中断，并满足了近喷嘴的喷嘴闪光沸腾的潜力喷气式崩解。

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