A Study of Turbulent Combustion Mechanism in a High Temperature, High-Pressure, and Low-Oxygen Environment

高温高压低氧环境下湍流燃烧机理研究

基本信息

批准号：
15360105
负责人：
KOBAYASHI Hideaki
金额：
$ 9.22万
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：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360105/
关键词：
High-pressure combustion High-temperature air combustion Low oxygen concentration Exhaust gas recirculation Intrinsic flame instabilitry Turbulent burning velocity Laser induced fluorescence Flame structure 予熱空気 OH-PLIF 低酸素濃度乱流燃焼

项目摘要

This project aims to extend the research of high-pressure and high-temperature turbulent combustion to the low oxygen concentration combustion in terms of utilizing for new premix-type gas turbine combustors with an exhaust gas recirculation. Turbulent premixed flames and turbulent non-premixed flames using oxidizer diluted with N_2 and CO_2 were investigated. Observation and analysis of instantaneous flame structure using OH-PLIF and CH-PLIF were conducted. Measurements of turbulence characteristics, NOx emission, and turbulent burning velocity were also performed.For turbulent non-premixed flames, oxidizer preheated up to 1300 K, whose oxygen concentration was 4 vol % minimum diluted with CO_2 and N_2 were visualized using CH-PLIF. It has been proved that bubble-like flame structures are formed especially in the case of lifted flames. Low NOx emission has been also confirmed even for non-lifted flame using a NOx analyzer.For turbulent premixed flames, flame stabilization for the meth … More ane-air mixture preheated up to 573 K diluted with CO_2 at pressure up to 1.0 MPa has been succeeded. The oxygen concentration of the mixture could be reduced up to 10 vol % simulating the condition of premix-type gas turbine combustors with exhaust gas recirculation. Instantaneous OH-PLIF images were obtained and fractal analysis was performed to explore the effects of intrinsic flame instability on CO_2 diluted premixed flames. Moreover, Turbulent burning velocity and time-averaged production rate of product species were determined. As a result, turbulent premixed flames for low oxygen concentration due to CO_2 dilution at high pressure and high temperature increases the volume of heat release region and reduces the time averaged production rate of combustion products, leading to mild heat releasing. These characteristics are an important factor for reducing combustion instability of premix-type gas turbine combustors and profitable features in terms of realizing new premix-type gas turbine combustors with exhaust gas recirculation proposed in this research project. Less

该项目旨在扩大高压和高温湍流燃烧，以使用氧化剂稀释N_2的氧化剂，以使用OH-PLAME结构分析，以使用氧化剂稀释。还进行了测量湍流特性，NOX发射和turberent燃烧速度。对于湍流的非固定MES，氧化剂预热了1300 K，其氧气的氧气浓度为4 vol％用CO_2和N_2稀释，使用CH-PLIF可视化。尤其是在升起的火焰的情况下，已经形成了像泡泡状的火焰结构。至1.0 MPa已成功，可以将氧气降低至10 vol％，以模拟带有排气RR Ecirculation的预制式燃气轮机燃烧器的状况。固有的不稳定性，co_2稀释的火焰区域并降低了燃烧产品的时间平均速率，这些特征是RR教育燃烧前燃烧器的燃烧器的重要性，并且在实现此研究项目中使用的带有废气再循环的新预柏油Tors方面有利可图