A Study of Turbulent Combustion Mechanism in a High-Pressure, High-temperature and High Water-vapor Environment

高压高温高水汽环境下湍流燃烧机理研究

基本信息

批准号：
17360090
负责人：
KOBAYASHI Hideaki
金额：
$ 9.34万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360090/
关键词：
Turbulent combustion High-pressure combustion Premixed combustion Exhaust gas recirculation Water vapor Turbulent burning velocity Laser induced fluorescence Particle tracking velocimetry 固有不安定性

项目摘要

The purpose of this project is to explore turbulent combustion mechanism for low oxygen mixture highly diluted with water vapor considering the applications of exhaust gas recycling to high-load combustion at high pressure. Because the exhaust gas consists of water vapor, carbon dioxide and nitrogen, the effects of dilution especially with water vapor and carbon dioxide on combustion characteristics were investigated systematically. For turbulent and laminar premixed flames from ordinary pressure to high pressure, flame structure and burning velocity were measured using laser diagnostic methods.In the first year, parallel to the experiments on carbon dioxide dilution effects on high-pressure turbulent premixed flames, an apparatus to generate water vapor in a high-pressure environment using a copper cylinder, rod heaters and steel wool connected to a water mass-flow controller was developed and it was confirmed that the apparatus stably provided water vapor over a wide range of water s … More upply. Using the apparatus, differences in light emission from the flames depending on the dryness of the mixture were confirmed.In the second year, experiments for turbulent premixed flames diluted with water vapor up to 0.1 of moler fraction were successfully performed at high pressure and high temperature. By using OH-PLIF, profiles of the mean progress variable based on 500 OH-PLIF images were analyzed and the turbulent burning velocity and mean volume of the turbulent flame region were measured, and then compared with those for carbon dioxide dilution. Moreover, simultaneous measurement of OH-PLIF and PTV was performed for laminar flames to measure the laminar burning velocity and the effects of water vapor. As a result, it was found that the burning velocity for the mixtures diluted with water vapor was larger than that of numerical simulation in the fuel rich region and it was implied that fuel reforming reactions causes the phenomenon. Also, it was found that concentration of carbon monoxide in the burnt gas was reduced as an effect of the water vapor addition. Less

该项目的目的是探索湍流混合物的湍流组合机制，考虑到废气回收到高压下高负载组合的应用高度稀释。由于废气由水蒸气，二氧化碳和氮组成，因此系统地研究了稀释的稀释作用，尤其是在水蒸气和二氧化碳对混合物特性的影响。对于从普通压力到高压的湍流和层流的预混合火焰，使用激光诊断方法测量火焰结构和燃烧速度。第一年，在第一年，与对二氧化碳稀释的实验相似开发了控制器，并确认该设备在各种水中提供了水蒸气……更大。使用该设备，确认了由混合物的干燥度确认的光发射的差异。在第二年，在高压和高温下成功地执行了用水蒸气稀释的湍流预混合火焰的实验。通过使用OH-PLIF，分析了基于500个OH-PLIF图像的平均进度变量的曲线，并测量了湍流燃烧速度和湍流火焰区域的平均体积，然后将其与二氧化碳稀释碳的平均值进行了比较。此外，对层状火焰进行了简单的OH-PLIF和PTV测量，以测量层状燃烧速度和水蒸气的影响。结果，发现被水蒸气稀释的混合物的燃烧速度大于富含燃料区域的数值模拟的燃烧速度，这暗示着燃料改革的反应会导致现象。同样，发现燃烧气体中一氧化碳的浓度降低是水蒸气添加的作用。较少的