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直噴汽油機(jī)噴油器射流顯微放大特性研究
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國家高技術(shù)研究發(fā)展計劃（863計劃）資助項目(2006AA110107)


Characterization of Gasoline Jets from a Single-hole Direct Injection Injector by Means of Microscopic Magnification
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    摘要:

    在定容彈試驗臺上，利用高速相機(jī)和長距顯微鏡相結(jié)合的方法，研究了不同噴油壓力和環(huán)境背壓下單孔直噴汽油機(jī)噴油器射流的顯微放大特性。結(jié)果表明，汽油射流表面會形成表面波，而且表面波的波長發(fā)展具有隨機(jī)性。間斷產(chǎn)生的表面波通常從射流向外擺動的切線處剝離后形成密集的微小液滴群，形成徑向分叉的霧化結(jié)構(gòu)。隨著噴油壓力的升高，射流表面波波長變短，表面波頻率提高，導(dǎo)致射流破碎加劇，形成的液滴直徑減小。此外，噴油壓力及環(huán)境背壓的升高使射流中相鄰徑向霧化分支之間的距離縮短。

    Abstract:

    The characteristics of the gasoline jets from a single-hole direct injection injector were investigated by means of a long-distance microscope and a high-speed digital camera at various injection pressures and backpressures. The results showed that the surface waves were formed along the surface of the gasoline jets, and developed randomly with time. Discontinued surface waves usually broke up at the places where the direction of jet changed and formed dense small droplets. With the increase of injection pressure, the wavelength of the surface wave shortened and their frequencies rose, which promoted the breakup of jets. The distance between two adjacent radial branches of a jet decreased with increasing fuel injection pressure and backpressure.

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何邦全,張倓愷.直噴汽油機(jī)噴油器射流顯微放大特性研究[J].農(nóng)業(yè)機(jī)械學(xué)報,2014,45(6):32-37. He Bangquan, Zhang Tankai. Characterization of Gasoline Jets from a Single-hole Direct Injection Injector by Means of Microscopic Magnification[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(6):32-37.

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  • 收稿日期:2013-05-06
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  • 在線發(fā)布日期: 2014-06-10
  • 出版日期: 2014-06-10