Slinger is a rotary atomizer whose atomization performance is affected by the parameters of orifice.8 kinds of orifices with different structure parameters were investigated,and an optimal diameter exists for the roun...Slinger is a rotary atomizer whose atomization performance is affected by the parameters of orifice.8 kinds of orifices with different structure parameters were investigated,and an optimal diameter exists for the round orifice with that the spray SMD is the smallest and the uniformity is the best.Increases in the axial length of slot orifice decrease the spray SMD and improve the spray uniformity,but increases in the width of the slot orifice are invalid for liquid spray SMD,and the spray uniformity becomes even worse.In most cases,the spray SMD of slot orifice is smaller than that of round orifice with the same perimeter,and the spray uniformity is better likewise.Increases in radial length of orifice cause the spray SMD to be larger,but the spray uniformity become obviously better.The spray SMD become larger with decreases in liquid surface tension.The spray uniformity became better nevertheless.展开更多
Slinger is a type of rotary atomizer wherein spray spatial distribution varies with the rotary speed and mass flowrate.The spray parameters at a series of locations in the radial direction of the slinger were measured...Slinger is a type of rotary atomizer wherein spray spatial distribution varies with the rotary speed and mass flowrate.The spray parameters at a series of locations in the radial direction of the slinger were measured and the parameters of the location where the spray Sauter Mean Diameter(SMD)corresponds to the smallest were selected to be analyzed.The results indicated that at a specific mass flowrate,an optimum diameter exists for the orifice,in which the orifice’s spray corresponds to the smallest and most uniform.Increases in the mass flowrate increase the optimum diameter.Further,the spray from the circular orifice is more uniform compared with that from the slot orifice with the same circumference.When the length of the orifice increases,the spray becomes larger but more uniform.The liquid regime in the orifice affects primary atomization of the liquid,significantly affecting the spray SMD and uniformity.展开更多
A theoretical and experimental investigation on the liquid breakup regimes of slinger is presented in this paper.The theoretical results show that in the round orifice of the slinger,if the contact angle between the l...A theoretical and experimental investigation on the liquid breakup regimes of slinger is presented in this paper.The theoretical results show that in the round orifice of the slinger,if the contact angle between the liquid and the wall is less than 90°,the liquid surface tension will inhibit the liquid lateral flowing under the Coriolis force.The formula used to predict the liquid regime leaving the orifice in the past was proved to be inaccurate,which is explained by two assumptions presented in this paper.The breakup regimes of the liquid film are related to the Weber number,and the characteristic length of the Weber number is equivalent to the thickness of the liquid film.The liquid film performed subcritical breakup when the Weber number was small and performed supercritical breakup when the Weber number was large.But when the Weber number was in the middle state,the breakup regimes could not be determined.The liquid breakup regimes affected the primary breakup of the liquid,but a lot of tiny droplets were produced in the secondary breakup,which led to poor correlation between the spray Sauter Mean Diameter(SMD)and the Weber number corresponding to various liquid breakup regimes.On the whole,the spray SMD performs a power relationship with the Weber number corresponding to the liquid film regime,and the correlation coefficient is close to 0.9.展开更多
航空发动机对尺寸有严格限制,甩油盘直径越大,雾化效果越好。针对甩油盘在发动机启动、慢车及高海拔地区工作时雾化性能不足,对甩油盘的最小适用直径Dmin进行了理论研究。甩油盘在液柱破碎模式时雾化性能最好,研究得到了各转速下甩油盘...航空发动机对尺寸有严格限制,甩油盘直径越大,雾化效果越好。针对甩油盘在发动机启动、慢车及高海拔地区工作时雾化性能不足,对甩油盘的最小适用直径Dmin进行了理论研究。甩油盘在液柱破碎模式时雾化性能最好,研究得到了各转速下甩油盘处于液柱破碎模式时燃油流量的计算方法。不同流量对应的液雾索特尔平均直径(Sauter Mean Diameter, SMD)不同,根据燃油流量计算得到甩油盘液雾SMD的范围,并由此推导出满足发动机启动、慢车状态要求的甩油盘最小适用直径Dmin的计算公式。高海拔对甩油盘雾化有不利影响,研究得到了海拔H处,甩油盘最小适用直径DHmin的计算公式。某型发动机启动转速为6000r/min,慢车转速为20000r/min,当燃油为航空煤油RP-3时,经理论分析,得到地面甩油盘直径应大于7.77cm;高海拔4000m处,甩油盘直径应大于9.49cm。展开更多
文摘Slinger is a rotary atomizer whose atomization performance is affected by the parameters of orifice.8 kinds of orifices with different structure parameters were investigated,and an optimal diameter exists for the round orifice with that the spray SMD is the smallest and the uniformity is the best.Increases in the axial length of slot orifice decrease the spray SMD and improve the spray uniformity,but increases in the width of the slot orifice are invalid for liquid spray SMD,and the spray uniformity becomes even worse.In most cases,the spray SMD of slot orifice is smaller than that of round orifice with the same perimeter,and the spray uniformity is better likewise.Increases in radial length of orifice cause the spray SMD to be larger,but the spray uniformity become obviously better.The spray SMD become larger with decreases in liquid surface tension.The spray uniformity became better nevertheless.
基金the National Natural Science Foundation of China(Grant No.51506003).
文摘Slinger is a type of rotary atomizer wherein spray spatial distribution varies with the rotary speed and mass flowrate.The spray parameters at a series of locations in the radial direction of the slinger were measured and the parameters of the location where the spray Sauter Mean Diameter(SMD)corresponds to the smallest were selected to be analyzed.The results indicated that at a specific mass flowrate,an optimum diameter exists for the orifice,in which the orifice’s spray corresponds to the smallest and most uniform.Increases in the mass flowrate increase the optimum diameter.Further,the spray from the circular orifice is more uniform compared with that from the slot orifice with the same circumference.When the length of the orifice increases,the spray becomes larger but more uniform.The liquid regime in the orifice affects primary atomization of the liquid,significantly affecting the spray SMD and uniformity.
文摘A theoretical and experimental investigation on the liquid breakup regimes of slinger is presented in this paper.The theoretical results show that in the round orifice of the slinger,if the contact angle between the liquid and the wall is less than 90°,the liquid surface tension will inhibit the liquid lateral flowing under the Coriolis force.The formula used to predict the liquid regime leaving the orifice in the past was proved to be inaccurate,which is explained by two assumptions presented in this paper.The breakup regimes of the liquid film are related to the Weber number,and the characteristic length of the Weber number is equivalent to the thickness of the liquid film.The liquid film performed subcritical breakup when the Weber number was small and performed supercritical breakup when the Weber number was large.But when the Weber number was in the middle state,the breakup regimes could not be determined.The liquid breakup regimes affected the primary breakup of the liquid,but a lot of tiny droplets were produced in the secondary breakup,which led to poor correlation between the spray Sauter Mean Diameter(SMD)and the Weber number corresponding to various liquid breakup regimes.On the whole,the spray SMD performs a power relationship with the Weber number corresponding to the liquid film regime,and the correlation coefficient is close to 0.9.
文摘航空发动机对尺寸有严格限制,甩油盘直径越大,雾化效果越好。针对甩油盘在发动机启动、慢车及高海拔地区工作时雾化性能不足,对甩油盘的最小适用直径Dmin进行了理论研究。甩油盘在液柱破碎模式时雾化性能最好,研究得到了各转速下甩油盘处于液柱破碎模式时燃油流量的计算方法。不同流量对应的液雾索特尔平均直径(Sauter Mean Diameter, SMD)不同,根据燃油流量计算得到甩油盘液雾SMD的范围,并由此推导出满足发动机启动、慢车状态要求的甩油盘最小适用直径Dmin的计算公式。高海拔对甩油盘雾化有不利影响,研究得到了海拔H处,甩油盘最小适用直径DHmin的计算公式。某型发动机启动转速为6000r/min,慢车转速为20000r/min,当燃油为航空煤油RP-3时,经理论分析,得到地面甩油盘直径应大于7.77cm;高海拔4000m处,甩油盘直径应大于9.49cm。
