压电振子作为激励源在液体燃料雾化中的应用  

PIEZOELECTRIC VIBRATOR AS AN EXCITING RESOURCE USED IN LIQUID FUEL ATOMIZATION

作　　者：孙清池[1] 左孝杰[1] 孙琳[1] 刘涛[1] 杜青[2] 王俐聪[3] 

机构地区：[1]天津大学材料学院 [2]天津大学内燃机燃烧学国家重点实验室 [3]天津大学理学院,天津300072

出　　处：《硅酸盐学报》2002年第6期749-754,共6页Journal of The Chinese Ceramic Society

基　　金：天津大学高温结构陶瓷及工程陶瓷加工技术教育部重点实验室资助;国家自然科学基金资助项目(59906008)。

摘　　要：选取高机电转换系数K15(0.71)、品质因数Qm(2100)及矫顽电场Ec(1860 V/mm)的Pb(Mn1/3Sb2/3)O3-Pb(Zr1-xTix)O3三元系压电材料制备压电振子,将压电振子粘贴在内燃机燃油喷嘴上,构成新的燃烧喷射系统。压电振子的应用,提高了射流液体的雾化效果,并将喷射系统压力由7 MPa降到3 MPa。采用激光漫射的方法拍摄各种喷射条件下射流液体的雾化过程。经比较,切变K15振子喷射系统的雾化效果优于厚度Kt振子的雾化效果。当压电振子和喷射液体的固有频率相同(谐振)时,喷射液体振幅最大,雾化效果最佳。谐振时,激励电压越高,喷射雾化效果越好。A piezoelectric vibrator was prepared by traditional piezoelectric materials of Pb(Mn1/3Sb2/3)O3 - Pb(Zr1-xTix)O3(MS-PZT) with high K15(0.71) , Qm(2100) and Ec(l 860 V/mm) . A new combustion jetting system was produced by sticking the vibrator to the nozzle of the internal combustion engine. The application of the piezoelectric vibrator improved the atomization effect of the jetting liquid and reduced the jetting pressure from 7 MPa to 3 MPa. The atomization process of the jetting liquid was pictured by laser diffusion in various jetting conditions. The atomization degree with shear vibrators was found higher than that with thickness vibrators. When the frequency of the piezoelectric vibrator is equal to the frequency of the liquid jetting (resonance), the amplitude reach the maximum and the atomization'achieve the best efficiency. At the resonant state, the atomization degree increase gradually with increasing the exciting voltage.

关 键 词：压电振子 激励源 液体燃料 雾化 应用 压电陶瓷 振动模式 内燃机 喷射压力 

分 类 号：TK406[动力工程及工程热物理—动力机械及工程]