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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

本计画旨在将高温高压紊流燃烧之研究延伸至低氧浓度燃烧，以应用于具有废气再循环之新型预混式燃气涡轮机燃烧室。研究了N_2和CO_2稀释氧化剂对湍流预混火焰和湍流非预混火焰的影响。利用OH-PLIF和CH-PLIF对瞬态火焰结构进行了观察和分析。对于湍流非预混火焰，采用CH-PLIF对预热至1300 K、氧浓度最低为4vol%的氧化剂在CO_2和N_2稀释下的湍流燃烧过程进行了可视化研究。实验证明，气泡状火焰结构的形成，特别是在提升火焰的情况下。对于湍流预混火焰，采用NOx分析仪对火焰稳定性进行了研究，结果表明： ...更多信息在1.0MPa压力下，用CO_2稀释预热至573 K的空气-空气混合气，获得了成功。模拟带有废气再循环的预混型燃气涡轮机燃烧室的条件，混合气的氧浓度可以降低到10体积%。通过对CO_2稀释预混火焰的瞬态OH-PLIF图像进行分形分析，探讨了本征火焰不稳定性对CO_2稀释预混火焰的影响。此外，还测定了湍流燃烧速度和产物的时均生成率。结果表明，高温高压下CO_2稀释导致低氧浓度湍流预混火焰的放热区体积增大，燃烧产物的时均生成率降低，导致放热温和。这些特性是降低预混型燃气涡轮机燃烧室燃烧不稳定性的重要因素，也是实现本研究项目提出的具有废气再循环的新型预混型燃气涡轮机燃烧室的有利特征。少