查询词典 combustion

As the first attempt, this paper applies the laminar flamelet model to the typical diffusion combustion in diesel engines. A database of the laminar flamelet for a DI engine is built up in the phase space of the mixture fraction with the scalar dissipation rate as parameter.

以KIVA-3程序为基础，摒弃其原有的化学反应模型，模拟内燃机缸内多维湍流流场，并补充求解混合分数的时均值及其脉动均方值的湍流输运方程，得出各曲轴转角下混合分数的时均值及其脉动均方值的缸内空间分布。

Base on the turbulent shoot non-premixed combustion of methane/air, make a coordinate transform on flame for reactive scalar equation, build laminar flamelet model for two dimension steady state non-premixed turbulent reacting flows.

以甲烷／空气的湍流射流扩散燃烧为基础，对通用的反应标量方程在火焰面上进行坐标变换，建立二维稳态湍流扩散火焰的小火焰模型。

Keywords turbulent combustion;laminar flamelet model;non-premixed

湍流燃烧；小火焰模型；扩散

The application of flamelet model based on level set in premixed turbulence combustion;2. A methane turbulent non-premixed flame has been simulated numerically by the combination of laminar flamelet model and presumed probability density function.

将小火焰模型和假定的PDF方法相结合，模拟甲烷湍流射流扩散火焰，稳态火焰面结构由层流小火焰数据库得到，采用详细化学反应机理描述甲烷的氧化和NO以及碳烟的生成，数值模拟结果和实验数据吻合较好，说明小火焰模型可以较准确地计算出扩散湍流火焰中的燃烧过程。

Firstly, the two parts are solved separately, and the results are then coupled together. Because the thickness of the combustion reaction zone at high Re and Da numbers is less than the turbulent diffusion scale in diesel engines, the flame is extremely thin, its micro-structure keeps the laminar structure, so the turbulent flame can be regard as the ensemble of locally one dimensional, thin laminar flamelet embedded within the turbulent flow field.

由于柴油机中在高雷诺数和高Damkoeler数的情况下，燃烧反应区厚度小于湍流耗散尺度，火焰极薄，其微元保持层流结构，因此，湍流火焰可视为嵌入湍流流场内局部具有一维结构的薄的层流小火焰的系综，这便构成了层流小火焰模型主导思想，同时也使层流小火焰模型模拟柴油机湍流燃烧过程成为可能。

Based on measured temperatures and analysis, it is believed that sub-millimeter plane cell combustor can overcome difficulties of the ignition and flameout due to increasing heat loss, and achieve stable combustion.

结果表明，在一定条件下，亚毫米平板式微燃烧室能克服壁面能量损失激增而带来的着火困难和火焰淬熄等问题，能够实现稳定燃烧。

Its main forms in the combustion process is caused due to high temperature flamer tempered, once this happened is not achieve ideal result, welding is easy to make flame back to burn the dangers.

其主要形式是在燃烧过程中由于火焰枪温度过高造成回火，一旦发生这种情况既不能达到焊接理想效果，也容易使火焰回燃造成危险。

Although oxygen is not flammable it will support and vigorously accelerate the combustion of other materials.

尽管氧本身是不可燃的，它能支持和大大加速其它材料的燃烧。

By adjusting the height of flashboard and the speed of conveyor belt, it will control the quantity of feed-in raw materials, balance pug and internal combustion material proportionally, and crush the large soft mud.

通过调节闸板高度及运输带的速度，控制原料的给料量，对泥料和内燃材料进行有比例的掺合，并能破碎较大的松软泥料。

In order to simulate the fire of the cables in plenum, the fire tests on plenum cables were carried out in the burn room and plenum structure of a typical full-scale combustion flatlet model in the present paper.

在一个全尺寸燃烧套房模型中进行了起火室和顶棚夹层空间电缆火灾的实验研究，并采用大涡模拟的方法对实验中烟气速度场进行了数值模拟。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。