乳化油的蒸发和燃烧研究

本文从理论和实验两方面研究航空煤油和0~#柴油乳化液的蒸发和燃烧特性。结果表明,乳化油燃烧时出现的微爆现象能明显缩短油珠的生存期,对提高燃烧效率和强化燃烧十分有利;乳化油的燃烧,也为抑制氮氧化物和微碳粒的生成提供了有利的条件。文中也详细讨论了主要工作参数对微爆过程的影响,对乳化油的工程应用有参考价值。

A STUDY ON EVAPORATION AND COMBUSTION OF OIL/WATER EMULSIFIED FUEL

The evaporation and combustion processes of RP-2 aviation kerosene/water and No2 diesel oil/water emulsified fuel are studied experimentally and analytically. The micro-explosion processes of suspended droplets are demonstrated by high-speed photography and also testified by abrupt temperature variaition measured with the suspended thermo-couple. A steady state frozen model for an oil/water droplet is adopted to calculate droplet evaporation and combustion. The micro-explosion is assumed to occur as the droplet temperature reaches so called "superheat temperature" , which is from 550K to 580K. The calculated results are in good agreement with experimental data. The micro-explosion makes life-time of droplet cut down significantly, and formation of NOx and soot suppressed by water emulsification. Finally, influences of some parameters, such as ambient pressure and temperature, water content, initial tempersture of fuel, and relative velocity of droplet to gas on micro-explosion are investigated.