徐胜利课题组研究方向简介.ppt

* 介绍该激波管的特点，和存在的问题 采用超声乳化器和表面吹气方法难以形成浓度均匀两相流，也无法准确控制混合物的当量比。 由于进气管道直径较小，导致气流速度偏高，两相流会在管道弯曲部分汇聚，难以保证进入低压段的两相流均匀分布。 低压段端面有四个进气活塞，各活塞截面积较小，而且存在活塞杆，因此，难以实现两相流均匀性进气。 采用入射和反射激波加热煤油/空气混合物并使其汽化，认为可得到了气相煤油点火延时。我们认为：在低温情况下，需要精确测定不同时刻液滴粒径、估算液滴寿命，才能确认液滴是否完全蒸发。 未开展碳氢燃料点火现象和火焰微观结构的光谱成像测量研究。 * 强调怎么实现当量比的控制。 Fig3 modeling methods for turbulent combustion (geometrical analysis, mixing description, statistical approach ) aerosol production assembly air bottle aerosol tank regulator pressure meter kerosene nozzle kerosene cup pressure meter （2）data aquisition auto-ignition delay: time interval of signals between pizeo-electric gauge and photomultiplier （3）luminosity imaging chemoluminescene: OH radical Imaging: ICCD Synchronization: DG535 Schematic of emission imaging oscilloscope DG535 test section PC amplifier PCB1~PCB3 PMT impedance adaptor ICCD （1）auto-ignition delay 3. Results and Discussions Davidson Hanson 2000 Davidson Hanson 2005 T5=1554K, P5=0.115MPa Definition of auto-ignition delay ? peak of emission history ? maximum slope of emission history ? horizontal intersection point of maximum slope of emission history Repeatability of test results No. T1 (K) Ms T5 (K) p5 (MPa) ?ig (ms) 1 288 3.183 1514 0.116 0.538 2 286 3.197 1515 0.117 0.468 3 286 3.202 1519 0.117 0.559 auto-ignition delay of kerosene air mixture auto-ignition delay of kerosene air mixture at different p5=0.1MPa, 0.3MPa, 0.6MPa re-arrangement of auto-ignition delay of kerosene air mixture at different initial pressure fitted formula of auto-ignition normalization of auto-ignition delay of kerosene air mixture at different initial pressure 1339K 1418K 1469K 1496K 1515K 1626K histories of pressure and OH-emission during auto-ignition delay of kerosene air mixture p5=0.1MPa 1241K 1299K 1359K 1379K 1207K 1243K 1325K histories of pressure and OH-emission of auto-igniting kerosene air mixture p5=0.3MPa p5=0.6MPa species CH4 C2H6 C3H8 C2H4 C3H6 mole fraction 0.35 0.20 0.15 0.15 0.15 Surrogate of sup