预燃

The NOx and CO〓 emissions are reduced by more than 15%. But the Total Hydrocarbon and CO emissions increase at low load. In the dual fuel engine, premixing combustion is dominant. Its ignition delay and combustion duration are longer than those of the diesel engine.

双燃料发动机在中高负荷下的燃烧与原柴油机有很大不同，预混燃烧占主导地位，滞燃期和燃烧持续期较长，最大爆发压力及最大压力变化率较原机低，发动机运转柔和，噪声较低。

With the improvement of environmental requirements, premixed poor combustion gas turbines has been widely used in industry. But the thermoacoustic instability causes bad effects like noise and vibration during its work process.

随着环保要求的提高，预混贫燃燃气轮机被广泛应用于工业生产中，但热声不稳定这一现象在其工作过程中带来了一系列噪声和振动等不良影响。

Propagation and development characteristics of surface instability of the spherical premixed flames for methanol-air-nitrogen mixtures were studied by using a constant volume combustion chamber and high-speed schlieren photography system.

利用高速纹影摄像法在定容燃烧弹内研究了不同燃空当量比、初始压力、初始温度和气体稀释度下甲醇－空气－氮气混合气预混球型火焰的发展特性以及3种火焰锋面的不稳定性。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。