An energy method is proposed to investigate the critical transformation condition from a Taylor cone to a cone-jet. Based on the kinetic theorem, the system power allocation and the electrohydrodynamics stability are ...An energy method is proposed to investigate the critical transformation condition from a Taylor cone to a cone-jet. Based on the kinetic theorem, the system power allocation and the electrohydrodynamics stability are discussed. The numerical results indicate that the energy of the liquid cone tip experiences a maximum value during the transformation. With the proposed jetting energy, we give the critical transformation condition under which the derivative of jetting energy with respect to the surface area is greater than or equal to the energy required to form a unit of new liquid surface.展开更多
为合理选择微型荷电喷雾燃烧器的结构设计和工作参数,基于新设计的微型毛细管电极–环形电极–网格双电极荷电喷雾燃烧器,开展液体燃料乙醇雾化实验研究,得出了稳定的锥–射流雾化工作模式。基于该工作模式,对双电极产生的电场强度进行...为合理选择微型荷电喷雾燃烧器的结构设计和工作参数,基于新设计的微型毛细管电极–环形电极–网格双电极荷电喷雾燃烧器,开展液体燃料乙醇雾化实验研究,得出了稳定的锥–射流雾化工作模式。基于该工作模式,对双电极产生的电场强度进行理论计算,采用数值模拟的方法对流场和电场的耦合场进行分析求解,运用乙醇–空气两相流水平集方法模拟乙醇的流动。在体积流量为1 m L/h、毛细管电压4.19 k V、环形电极电压1 k V时得到了稳定的锥–射流、毛细管附近场强分布和两相流的速度场。经过理论计算得出了乙醇产生雾化的最小体积流量。研究表明:轴向场强和径向场强在锥射流内部均逐渐增大,在锥射流界面达到最大值后逐渐减小。由于射流的外侧速度矢量出现漩涡并沿分界面的切面方向运动,促进了锥射流的形成。当环形电极电压一定时,高于最小体积流量的乙醇在适合的毛细管电压下可得到稳定的锥射流。展开更多
基金supported by the National Basic Research Program of China(Grant No.2013CB733004)
文摘An energy method is proposed to investigate the critical transformation condition from a Taylor cone to a cone-jet. Based on the kinetic theorem, the system power allocation and the electrohydrodynamics stability are discussed. The numerical results indicate that the energy of the liquid cone tip experiences a maximum value during the transformation. With the proposed jetting energy, we give the critical transformation condition under which the derivative of jetting energy with respect to the surface area is greater than or equal to the energy required to form a unit of new liquid surface.
文摘为合理选择微型荷电喷雾燃烧器的结构设计和工作参数,基于新设计的微型毛细管电极–环形电极–网格双电极荷电喷雾燃烧器,开展液体燃料乙醇雾化实验研究,得出了稳定的锥–射流雾化工作模式。基于该工作模式,对双电极产生的电场强度进行理论计算,采用数值模拟的方法对流场和电场的耦合场进行分析求解,运用乙醇–空气两相流水平集方法模拟乙醇的流动。在体积流量为1 m L/h、毛细管电压4.19 k V、环形电极电压1 k V时得到了稳定的锥–射流、毛细管附近场强分布和两相流的速度场。经过理论计算得出了乙醇产生雾化的最小体积流量。研究表明:轴向场强和径向场强在锥射流内部均逐渐增大,在锥射流界面达到最大值后逐渐减小。由于射流的外侧速度矢量出现漩涡并沿分界面的切面方向运动,促进了锥射流的形成。当环形电极电压一定时,高于最小体积流量的乙醇在适合的毛细管电压下可得到稳定的锥射流。
