查询词典 droplet

Key words: engineering thermophysics; fuel droplets; self-ignition; droplet ignition delay time

关键 词：工程热物理；燃料液滴；自点火延迟；液滴自点火延迟时间

This model clearly divides the droplet self-ignition delay into two parts, the physical delay and the chemical delay.

利用此简化模型，详细分析了环境温度和液滴大小对自点火延迟的影响：环境温度越低，气体微团温度也越低，自点火延迟时间越长，物理延迟部分所占比重越大；液滴初始半径越小，自点火延迟时间越短，化学延迟部分所占比重越大。

The results have shown that self-sustained energy balance in the heat release zone in the flame is highly sensitive to the external energy loss, which in this case is due to water droplet evaporation.

结果显示，火焰热释放区内自持性能量守恒对外部能量消耗非常敏感。在本试验中，主要是水滴蒸发造成的能量消耗。

Using the degree of depolarization,cause of depolarization was discussed,and the droplet can be viewed as a sphericity in the lighter fog.

衰减的测量是确定室外激光通讯系统可行性的首要因素。1960年Kurnick等[1]研究了由雾引起的红外辐射的衰减。

A submicroscopic aggregation of molecules,as a droplet in a colloidal system .

微团亚微观分子团，如胶粒系统中的一小液滴

In Scramjet, the evaporation of most liquid fuel occurs under the subnormal pressure condition. However, it is rarely seen in the existing documents about the study of the evaporation and combustion of the fuel droplet at subnormal pressure. This thesis gives the experimental and theoretical study about that.

在超燃冲压发动机的燃烧室中，液体燃料的蒸发大部分是在一个负压环境下完成的，现有文献对负压环境下燃料液滴蒸发和燃烧过程的研究却很少，本文对负压环境下燃料液滴蒸发过程进行了试验和理论研究。

According to the request of adopting advanced technology, the main designing has such contents as below:⑴ Designing the two-fluid nozzle that is based on the theory of air-atomize spraying.⑵ Designing and choosing the type of the axial fan that is used to supply assisted airflow to waft droplets that comes from nozzle.⑶ Designing the swaying outfit that can rotate the spray assembly at a speed and inside a angle in order to satisfy the spray request of different crops, different planting states and improve the uniformity of distribution, the deposition of droplet. Here, we select TYV type reduction gear motor to adjust the swaying speed and use course switch to adjust the swaying angle.⑷ Designing the lift outfit that can adjust the height of the spray assembly to satisfy the request of the crops of different tallness, different spraying range. Here, we select cylinder as the main component that can be used as kickstand and controlled easily.⑸ Designing the switch of the power supply that is put out of the greenhouse in order to prevent worker from poisoning. After the mist sprayer being made, the experiment is made to test the function of the greenhouse mist sprayer fully.

根据采用先进施药技术的要求，本研究的设计内容主要有：⑴采用气液两相流喷雾技术，基于气力雾化原理，设计双流体喷头；⑵采用辅助气流输送雾滴，气流源为风机，对风机进行设计、选型；⑶为满足不同作物、不同栽培情况及提高雾滴分布均匀性、沉积性的施药要求，设计能带动喷射部件在一定角度内、以一定转速的旋转摇摆机构，本研究选用调速电机调节其摇摆速度，并利用反向行程开关调节其摇摆角度；⑷为满足不同高度作物、不同射程的施药要求，设计能调节喷射部件高度的升降机构，这里选用气缸为主要构件，既可以起到整机支架的作用，又可方便进行升降、固定控制；⑸设计行程开关的控制电路以及整机的控制系统。

In this paper,a water droplet motion model in thermal insulation countercurrent air flow is built based on the non-spherical particle drag coefficient,and the explicit formulation for terminal velocity is derived.

采用非球形颗粒的阻力系数关联式，建立了水滴在绝热逆流空气中的动力学方程，得出了水滴所受阻力及其最终沉降速度的计算方法。

In order to research the spray of LPG/diesel mixed fuel, it is the first time that this work studied the atomization characteristics of LPG/diesel, including spray angle, droplet size distribution, mean diameter, typical diameter, diffusion degree and impenetrate distance by using a high spatial resolution digital camera. At the same time, comparison of these characteristics of diesel and two kinds of LPG/diesel mixed fuel was taken.

为了探讨LPG／柴油混合燃料喷射的雾化效果，本文首次采用高分辨率数码照相机试验研究了柴油和LPG／柴油混合燃料的喷雾特性，包括喷雾锥角、贯穿距离、液滴尺寸分布、平均直径、特征直径和发散度和对雾化效果的影响；并比较了纯柴油和不同混合比例的LPG／柴油混合燃料的雾化特性，结果表明：柴油中掺混一定量的LPG有利于改善雾化。

The vapor pressure and heat of vaporization have been shown to be significant properties in nonsteady droplet vaporization.

在非稳态的液滴汽化中，蒸气压和汽化热是重要的性质。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。