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A Study on Atomization and Combustion under Super-Critical Atmospheric Conditions

超临界大气条件下雾化与燃烧的研究

基本信息

批准号：
60550155
负责人：
HIROYASU Hiroyuki
金额：
$ 1.15万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550155/
关键词：
Swirl Atomizer Diesel Nozzle High Pressure Combustion Non-Luminous Combustion Fraunhofer Diffraction Particle Size Analize Evaporating Spray ディーゼルノズル

项目摘要

The perpose of this study is to clarify the effect of high atmospheric temperature and pressure like a super-critical condition on the atomization and combustion process of a liquid fuel. First, the spray injected by a diesel nozzle was observed by a laser diffraction technique system and the Sauter mean diameter of the diesel spray on evaporating condition was measured. Next, the characteristics of spray which was formed by a swirl atomizer under high atomospheric conditions were observed by the same method. Last, new type of blue flame combustion system was developed to reduce the soot emission.From these three expremental works, we could obtain the useful results of the effect of high temperature and pressure on the spray combustion phenomena.Results are as follows.(1) With an increasing liquid viscosity, the spray angle decreases and the Sauter mean diameter gradually increases. With further increase of the viscosity, the Sauter mean diameter suddenly increases. There is an upper limit of the viscosity to be atomized as a spray of fine droplets.(2) At a high injection pressure, the effect of viscosity on the Sauter mean diameter still remains but the viscosity has no effect on the spray angle.(3) The angle of the spray formed by a swirl atomizer decreases with increasing the ambient pressure. But if the ambient pressure increases beyond 3.0 MPa, the spray angle decreases.(4) The Sauter mean diameter of evaporating spray takes the maxmum value in the evaporating process.(5) New type of blue flame combustor was developed. The principle of this combustion system were quick mixing process of the spray and combustion air by mean of the impinging the air jet to the fuel spray.

本研究的目的是阐明超临界条件下的高温高压对液体燃料雾化和燃烧过程的影响。首先，利用激光衍射仪观测了柴油机喷嘴喷射的喷雾过程，并测量了蒸发状态下柴油机喷雾的索特尔平均直径。其次，用同样的方法观察了旋流雾化器在高大气条件下形成的喷雾特性。最后，开发了一种新型的蓝色火焰燃烧系统来减少碳烟的排放，通过这三项实验工作，得出了高温高压对喷雾燃烧现象影响的有益结果。结果表明：(1)随着液体粘度的增加，喷雾角度逐渐减小，索特尔平均直径逐渐增大。随着粘度的进一步增加，Sauter平均直径突然增大。(2)在较高的喷射压力下，粘度对Sauter平均直径的影响仍然存在，但对喷雾角度没有影响。(3)旋流喷嘴形成的喷雾角度随着环境压力的增加而减小。但当环境压力超过3.0 Mpa时，喷雾角度减小。(4)蒸发喷雾的Sauter平均直径在蒸发过程中出现最大值。(5)研制了新型蓝色火焰燃烧器。该燃烧系统的原理是通过空气射流撞击燃油喷雾，使喷雾和燃烧空气快速混合。