A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame

A new pressurized vitiated co-flow burner (PVCB) was designed and built for the investigation of lifted flame properties and was supported by a vitiated co-flow of hot combustion products from a lean H2/air flame at a controllable pressure; its preliminary application for a methane lifted flame was...

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Main Authors: Qiushi Qin, Zhijun Wu, Qing Zhang, Wei Xie, Liguang Li, Jun Deng
Format: Article
Language:English
Published: MDPI AG 2018-05-01
Series:Energies
Subjects:
Online Access:http://www.mdpi.com/1996-1073/11/6/1402
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author Qiushi Qin
Zhijun Wu
Qing Zhang
Wei Xie
Liguang Li
Jun Deng
author_facet Qiushi Qin
Zhijun Wu
Qing Zhang
Wei Xie
Liguang Li
Jun Deng
author_sort Qiushi Qin
collection DOAJ
description A new pressurized vitiated co-flow burner (PVCB) was designed and built for the investigation of lifted flame properties and was supported by a vitiated co-flow of hot combustion products from a lean H2/air flame at a controllable pressure; its preliminary application for a methane lifted flame was tested. The distribution of the co-flow temperature, oxygen mole fraction, flow rate, and pressure of the PVCB was measured and calculated. The research results show that the co-flow temperature range is from 300 to 1300 K, the background pressure range is from 1 to 1.5 bar, the stable temperature field of the PVCB is wider, and the background pressure of the PVCB can be controlled. The simulation results show that the PVCB provides a controllable, pressurized co-flow of hot and vitiated gases, which makes it possible to investigate flame stabilization mechanisms. The PVCB has the advantages of controllable background pressure and a stable temperature field. The well-defined uniform boundary conditions and simplified flow of the PVCB simplify the establishment of a numerical model and decouple the turbulent chemical kinetics from the complex recirculating flow. It can be widely used in the research on lifted flames. A lifted flame of methane was recorded under conditions of a co-flow temperature of 1133 K and pressure from 1 to 1.043 bar. The lift-off height decreased and stabilized with the increase in the background pressure. The laminar flame speed and the autoignition delay time were tested and simulated at the same time by Chemkin; the influence of background pressure on the lift-off height, laminar flame speed, and autoignition delay were analyzed. The results show that the autoignition, as well as the flame propagation, dominated the stabilization mechanism of the lifted flame in the PVCB.
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spelling doaj.art-6e0fdc8ac4294051bc79c57e966710a62022-12-22T04:22:12ZengMDPI AGEnergies1996-10732018-05-01116140210.3390/en11061402en11061402A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted FlameQiushi Qin0Zhijun Wu1Qing Zhang2Wei Xie3Liguang Li4Jun Deng5School of Automotive Studies, Tongji University, Shanghai 201804, ChinaSchool of Automotive Studies, Tongji University, Shanghai 201804, ChinaSchool of Automotive Studies, Tongji University, Shanghai 201804, ChinaSchool of Automotive Studies, Tongji University, Shanghai 201804, ChinaSchool of Automotive Studies, Tongji University, Shanghai 201804, ChinaSchool of Automotive Studies, Tongji University, Shanghai 201804, ChinaA new pressurized vitiated co-flow burner (PVCB) was designed and built for the investigation of lifted flame properties and was supported by a vitiated co-flow of hot combustion products from a lean H2/air flame at a controllable pressure; its preliminary application for a methane lifted flame was tested. The distribution of the co-flow temperature, oxygen mole fraction, flow rate, and pressure of the PVCB was measured and calculated. The research results show that the co-flow temperature range is from 300 to 1300 K, the background pressure range is from 1 to 1.5 bar, the stable temperature field of the PVCB is wider, and the background pressure of the PVCB can be controlled. The simulation results show that the PVCB provides a controllable, pressurized co-flow of hot and vitiated gases, which makes it possible to investigate flame stabilization mechanisms. The PVCB has the advantages of controllable background pressure and a stable temperature field. The well-defined uniform boundary conditions and simplified flow of the PVCB simplify the establishment of a numerical model and decouple the turbulent chemical kinetics from the complex recirculating flow. It can be widely used in the research on lifted flames. A lifted flame of methane was recorded under conditions of a co-flow temperature of 1133 K and pressure from 1 to 1.043 bar. The lift-off height decreased and stabilized with the increase in the background pressure. The laminar flame speed and the autoignition delay time were tested and simulated at the same time by Chemkin; the influence of background pressure on the lift-off height, laminar flame speed, and autoignition delay were analyzed. The results show that the autoignition, as well as the flame propagation, dominated the stabilization mechanism of the lifted flame in the PVCB.http://www.mdpi.com/1996-1073/11/6/1402pressurized vitiated co-flow burnerlifted flamelift-off heightstabilization mechanism
spellingShingle Qiushi Qin
Zhijun Wu
Qing Zhang
Wei Xie
Liguang Li
Jun Deng
A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame
Energies
pressurized vitiated co-flow burner
lifted flame
lift-off height
stabilization mechanism
title A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame
title_full A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame
title_fullStr A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame
title_full_unstemmed A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame
title_short A Pressurized Vitiated Co-Flow Burner and Its Preliminary Application for a Methane Lifted Flame
title_sort pressurized vitiated co flow burner and its preliminary application for a methane lifted flame
topic pressurized vitiated co-flow burner
lifted flame
lift-off height
stabilization mechanism
url http://www.mdpi.com/1996-1073/11/6/1402
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