基于多物理场同步测量的铁颗粒燃烧热交换研究

IF 5.8 2区 工程技术 Q2 ENERGY & FUELS
Yutao Zheng , Jingruo Chen , Yuanzhe He , Minshuo Li , Xiuxiu Chen , Shijie Xu , Xin Wen , Yingzheng Liu , Weiwei Cai
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引用次数: 0

摘要

利用含铁颗粒的甲烷/空气/氧气预混本生火焰,研究了铁燃烧的热力学和流体动力学特性。采用集成诊断系统同时捕获气相和固相的特性。燃烧后的铁颗粒的温度是用高温法和RGB相机测量的,而这些颗粒附近的气相温度是通过背景取向纹影层析成像(BOST)测定的,由b型热电偶校准。利用平面粒子图像测速仪(PIV)对铁颗粒和周围气相的速度进行量化,并辅以图像分割来区分铁颗粒和氧化铝示踪剂。所有三种测量技术都实现了同步,校准确保了每种方法的数据可以在同一坐标系内准确地关联。统计分析集中在火焰区域下游的燃烧铁颗粒的行为,其中对流和辐射热损失通过现场测量完全解决,为理解两相流的传热现象提供了有益的见解。估计了惰性冷却对燃烧颗粒的温度下降,并与颗粒温度的条件平均进行了比较,揭示了反应冷却阶段产生的大量热量。总体而言,本研究采用了无缝集成的多物理场测量技术,提供了一种全面的方法来捕获燃烧铁颗粒的所有数据。该方法具有推广和应用于其他涉及颗粒的反应流的潜力。新颖性和意义声明首次进行了多物理测量,以捕获铁燃烧的所有热特性,通过直接测量可以估计铁燃烧与周围环境之间的热交换。统计估计了铁颗粒的温度演变及其相应的热损失作为其停留时间的函数,停留时间从它们离开辅助火焰的火焰前开始。模型铁温度与实测铁温度之间的良好一致性表明了这种测量技术的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation on heat exchange of iron particle combustion based on simultaneous multi-physics field measurements
A study was conducted using a premixed methane/air/oxygen Bunsen flame laden with iron particles to explore the thermal and fluid dynamic characteristics of iron combustion. An integrated diagnostic system was employed to simultaneously capture the characteristics of both gas and solid phases. The temperature of combusted iron particles was measured using pyrometry in conjunction with an RGB camera, while the gas phase temperature near these particles was determined through Background-Oriented Schlieren Tomography (BOST), calibrated by a B-type thermocouple. Velocities of the iron particles and the surrounding gas phase were quantified using Planar Particle Image Velocimetry (PIV), assisted by image segmentation to distinguish between the iron particles and alumina tracers. Synchronisation of all three measurement techniques was achieved, and calibration ensured that data from each method could be accurately correlated within the same coordinate system. Statistical analysis focused on the behaviour of combusted iron particles downstream of the flame region where the convection and radiation heat loss was fully resolved from in-situ measurement, providing insights beneficial for understanding heat transfer phenomena in two-phase flows. The temperature drop of burnt particles contributed from the inert cooling was estimated and compared with the conditional average of particle temperatures, revealing the significant heat production during the phase of reactive cooling. Overall, this study employed a seamlessly integrated multi-physics measurement technique, offering a comprehensive approach to capture all data on combusted iron particles. This methodology holds potential for extension and application to other reacting flows involving particulates.
Novelty and significance statement
A multi-physical measurement was first conducted to capture all thermal characteristics of iron combustion where the heat exchange between the iron combustion and its surrounding environment can be estimated from direct measurement. The temperature evolution of iron particles and their corresponding heat loss was estimated statistically as a function of their residence time, which was started from when they left the flame front of the assisted flame. A good consistency between the modelled and measured iron temperature revealed the reliability of such a measurement technique.
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来源期刊
Combustion and Flame
Combustion and Flame 工程技术-工程:化工
CiteScore
9.50
自引率
20.50%
发文量
631
审稿时长
3.8 months
期刊介绍: The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.
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