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Based on the theory of large eddy simulation and the method of VOF , the initial breakup process of fuel liquid jet, which eject from the nozzle exit at the time scale of micro-second level, is investigated. The mechanism of primary atomization is analyzed, and the initial breakup model of liquid jet is presented. By modeling and numerical simulation of atomization for a diesel nozzle under the given conditions, the initial umbrella-like spray shapes are obtained, which fits better with the experimental results. Meanwhile, the droplets secondary breakup process, such as leeward RT breakup, dumbbell-like breakup and droplets coalescence, etc. are exhibited visually.

基于大涡模拟LES理论和VOF方法，考察了燃油喷雾初始时刻即时间尺度为微秒级的液柱破碎过程，分析了初始破碎的机理，给出了该时间尺度下液柱初始破碎过程的模型；通过对一特定条件下的柴油机喷油器的建模和喷雾过程的大涡数值模拟，获得了液柱初始时刻"伞状头部"的喷雾形态，所得计算结果与相应的试验数据符合较好；数值模拟还直观地展现了液滴背风RT破碎、哑铃型破碎以及液滴的聚集融合等液滴的二次雾化过程。

Air dusting is used by the exhaust gas flow of air pump, dusting powder will force it into the air blowing through the pipeline, dusting sprays, mouth uniform will be anti-dirty guniting on 印张 surface.

气流喷粉是用气泵排气，气流堵住喷粉杯不兵粉送不入呼气管道，堵住喷粉嘴平均喷不入，不兵不攻粘脏喷粉撒在印弛面上。

A device and method for preparing compound nano fiber endless tow, which contains feeding material liquid to pair of electric spinning nozzle on frame, each nozzle respectively applied with high dc voltage with opposite polarity, each pair of nozzle jetting out nano fiber with opposite electric charge, said nano fiber attracting and colliding each other to form compound nano fiber, then forming nano fiber endless tow after drawing and stretching, the first opposite set pair of electric spinning nozzle jetted compound nano fiber endless tow is stretched down and used as acceptor which covered by the nano fiber jetted by second pair of nozzle an d forming two layers of compound nano fiber endless tow after drawing and stretching, in turn to get multilayer compound nano fiber endless tow after drawing and stretching by godet roller.

复合纳米纤维长丝束制备装置及其制备方法是一种简单、高效电纺制备纳米纤维长丝束的方法，其步骤为将料液输送给支架(3)上的电纺喷头对(1)；喷口相向的电纺喷头对(1)的每个喷头分别施加相反极性的直流高电压；每对相向喷口喷出分别带相反电荷的纳米纤维，并在空中相互吸引、碰撞形成复合纳米纤维，经牵引、拉伸后形成复合纳米纤维长丝束；第一对相向放置的电纺喷头纺丝形成的复合纳米纤维长丝束向下拉伸，并作为接受体与第二对电纺喷头喷出的分别带相反电荷并相互吸引的纳米纤维在空中相遇，被第二对电纺喷头喷出的纳米纤维包裹，经牵引、拉伸后形成两层复合纳米纤维长丝束；依次类推，最后经导丝辊对(2)牵引、拉伸后得到多层复合纳米纤维长丝束。

It also gets some modificatory curves. During test, the atomization characteristics is also tested and analyzed. The spray angle and distribution have been analyzed and obtained by experimentation in this system. The spray angle is figured out through the design principle.

通过试验也对喷油器的喷雾特性进行了测试和分析，本系统通过空心锥角喷雾测试方法计算出电控喷油器的雾化角，同时对于喷雾的均匀性分布进行了相应的测量。

Using high speed photograph and laser shadowgraph method, the effect of opening pressure of injection nozzle, environment pressure and injection orifice diameter on spray characteristics of dimethyl ether are studied by using a pressure bomb, and are compared with those of diesel.

采用高速摄影和激光阴影法在压力容弹中研究了喷油嘴启喷压力、环境介质的密度、喷孔直径等参数对二甲醚喷雾特性的影响，并与柴油的喷雾特性进行了对比。

Working principle is the power that uses water pump to serve as loop and sparge, the one side in gush room or 3 form Shui Lian, sparge is formed inside gush fog chamber, the Qi Wu of the generation when spray paint or burnish or dir

工作元理是使用水泵作为循环与喷雾的前进力，在喷房的一边或者三面产生水濂，在喷雾房内产生喷雾，喷涂或者磨擦时型成的漆雾或者尘士，在强效抽风作用以及影晌下经过水濂时随水势到水池内，剩余的通过喷雾室重新冲冼由排风机抽走，进而使排到室外的空气air达到和实现最好的诘白作用，满意环境保护请求。

The effects of the spray-drying process of the ammonium paratungstate and the carburization temperature on the formation of the precusor and WC powder were investigated.

采用喷雾干燥-固定床法制备碳化钨粉末，研究了喷雾干燥和碳化反应温度对制备偏钨酸铵前驱体以及碳化钨的影响，前驱体粉末呈现均匀的球状形态，平均粒径为10~20μm，喷雾温度对影响粒径大小和分布影响小；400℃的进口温度下进行喷雾干燥，喷雾粉末仍然保持偏钨酸铵原来的基本组成不发生分解。

Based on the above analysis and systematic design concept, VC++ language was employed to program for the tree image segmentation system and the tree crown recognition system and some still images were processed by the systems.

论文最后对树形识别系统在农药精确对靶喷雾中的应用进行了分析，从理论上研究了树木的类型同精确喷雾之间的关系，结合已识别出的树形及其相关参数，同时输入喷雾的相关参数，最终确定工作喷头的重叠量δ〓，从而作出判断，输出控制信号，决定工作喷头的数量及可变量喷雾技术的应用，以达到精确喷雾的目的。

Current machines used for food crops, prevention and control pests with: seed dressing machine, boom sprayer, knapsack spray powder machine, stretcher type sprayer, hand sprayer (compression, backpack, single tube, slip tube), hand-held electric centrifugal spray ...

当前我国用于粮食作物病虫草害的防治机具有：拌种机、喷杆喷雾机、背负式喷雾喷粉机、担架式喷雾器、手动喷雾器（压缩式、背负式、单管式、滑管式）、手持电动离心喷雾。。。

When the swirl variable device is part-opened, because swirl has some effect on the second injection, second injection timing has distinctly effect on fuel consumption, and the fuel consumption change fluctuantly with twice injection timing. When the tumble variable device is adopted, second injection timing also has effect on fuel consumption, but there is only one point that the fuel consumption is lowest. When the load is bigger, the second injection point where the fuel consumption is lowest is earlier than the smaller load.

在可变涡流结构中，当阀片处于非全开状态时，由于涡流运动对二次喷油的作用，二次喷油正时对发动机的比油耗存在明显影响，发动机比油耗随喷油正时改变呈较明显的波动状；在可变滚流结构中，二次喷油正时对发动机比油耗同样存在影响，但最低油耗点只有一个，当负荷较大时，最低比油耗所对应的喷油正时要更早一些。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。