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針板電極荷電液體射流不穩(wěn)定性分
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of Instability for Charged Liquid Jets with the Needle-plate Electrodes
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    摘要:

    基于荷電液體射流的模型和廣義坐標(biāo)下的Lagrange方程,建立了靜電場(chǎng)作用下無(wú)粘性液體射流的色散方程,,并對(duì)該方程進(jìn)行了數(shù)值求解,,分析了若干因素對(duì)荷電液體射流的軸對(duì)稱模型和非軸對(duì)稱模型的影響,。研究結(jié)果表明:隨著電場(chǎng)強(qiáng)度的增大,荷電液體射流的最大擾動(dòng)增長(zhǎng)率增大,。低電壓時(shí)靜電場(chǎng)對(duì)軸對(duì)稱射流的不穩(wěn)定性有顯著作用,,電壓逐漸升高時(shí)非軸對(duì)稱模型逐漸占據(jù)主導(dǎo)地位,最終導(dǎo)致液滴的破碎,;隨著射流半徑的減小,,荷電液體射流的不穩(wěn)定性增加,軸對(duì)稱模型下射流半徑的改變對(duì)射流不穩(wěn)定性的影響比非軸對(duì)稱模型??;不同的液體介質(zhì)對(duì)荷電液體射流不穩(wěn)定性的影響在非軸對(duì)稱模型下表現(xiàn)得更為顯著。

    Abstract:

    Based on the models of charged liquid jets and Lagrange equation under the generalized coordinate, the dispersion equations of inviscid liquid jets in an electrostatic field were established and solved by using the numerical methods. According to analyzing the calculated values, the effects of different factors on axisymmetric models and non-axisymmetric models of charged liquid jets were studied. The results showed as follows. The maximum value of the disturbed growth rate of charged liquid jets is increased with the stronger electric field intensity. When the voltage is lower, the electrostatic field has a significant effect on the axisymmetric instability models. The non-axisymmetric instability models exert a dominant influence since the voltage is enhanced gradually in an electrostatic field and it leads the droplets to break up finally. Instability of charged liquid jets is increased as the jet radius reduces. The changes of the jet radius in the non-axisymmetric modles have more effects on the instability of charged liquid jets than in the axisymmetric models. The effects of different liquid dielectrics on the non-axisymmetric charged liquid jets instability become very obvious.

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汪朝暉,廖振方.針板電極荷電液體射流不穩(wěn)定性分[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(8):86-91. of Instability for Charged Liquid Jets with the Needle-plate Electrodes[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(8):86-91.

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