Investigation of Lean Combustion Stability, Pressure Drop, and Material Durability in Porous Media Burners
Investigation of Lean Combustion Stability, Pressure Drop, and Material Durability in Porous Media Burners
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多孔介质燃烧器中稀薄燃烧稳定性、压降和材料耐久性的研究
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发表时间：
2017
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通讯作者：
M. Ihme
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作者：
Sadaf Sobhani;Bret Haley;D. Bartz;Jared A. Dunnmon;J. Sullivan;M. Ihme
对两区多孔介质燃烧器的燃烧稳定性和热耐久性进行了实验和计算研究。在恒定和循环开关条件下进行了长期材料耐久性测试，并对一系列等效比、质量流量和燃烧器设置进行了燃烧稳定性、压降和污染物排放的表征。给出了实验热电偶温度测量和压降数据，并与一维体积平均模拟结果进行了比较。实验和模型结果表明，用Darcy-Forchheimer方程和Ergun关系计算的温度分布和压降符合得很好。在上游燃烧区添加钇稳定氧化锆氧化铝（YZA），在下游燃烧区添加碳化硅（SiC），燃烧器的火焰稳定性得到增强。对产品气体浓度的测量表明，在接近闪回的条件下，CO的排放量最高，正如预期的那样，随着当量比的增加，NOx的排放量也会增加。*将所有信件寄给该作者。命名Di j物种我二进制扩散系数(m / s)生产商质量通量率(kg / m2) Pe沛克莱数(Pe = SLdp e f fρgcgλg) SL层流火焰速度(米/秒)Xi物种我摩尔分数易建联物种质量分数c比热容(j / KgK) dp孔径(m)高压体积传热系数(W / m3K)ṁ质量流率(公斤/ s)问̇热释放率(W / m3) u Volume-averaged流体速度(米/秒)ε孔隙度导热系数λ(W /可)κ辐射热量消光系数(W / m2K)Ω散射反照率Ω Ω i种i单位体积产量(kg/m3) φ当量比ρ密度(kg/m3) σ斯特凡-玻尔兹曼常数（W/m2K4） 1版权所有©2017年ASME涡轮博览会论文集：涡轮机械技术会议与博览会GT2017年6月26-30日，美国北卡罗来纳州夏洛特
The operational stability and thermal durability of combustion in two-zone porous media burners (PMBs) is examined experimentally and computationally. Long-term material durability tests at constant and cycled on-off conditions are performed, along with a characterization of combustion stability, pressure drop and pollutant emissions for a range of equivalence ratios, mass flow rates, and burner setups. Experimental thermocouple temperature measurements and pressure drop data are presented and compared to results obtained from one-dimensional volume-averaged simulations. Experimental and model results show good agreement for temperature profiles and pressure drop evaluated using the Darcy-Forchheimer equation with Ergun’s relations. Enhanced flame stability is observed for burners with Yttria-stabilized Zirconia Alumina (YZA) upstream and Silicon Carbide (SiC) in the downstream combustion zone. Measurements of product gas concentrations illustrate highest emissions of CO at conditions close to flash-back and, as expected, higher NOx emissions with increasing equivalence ratios. ∗Address all correspondence to this author. NOMENCLATURE Di j Species i binary diffusion coefficient (m/s) MFR Mass flux rate (kg/m2s) Pe Peclet number (Pe = SLdp,e f f ρgcg λg ) SL Laminar flame speed (m/s) Xi Species i mole fraction Yi Species i mass fraction c Specific heat capacity (J/KgK) dp Pore diameter (m) hv Volumetric heat transfer coefficient (W/m3K) ṁ Mass flow rate (kg/s) q̇ Heat release rate (W/m3) u Volume-averaged fluid velocity (m/s) ε Porosity λ Thermal conductivity (W/mK) κ Radiative heat extinction coefficient (W/m2K) Ω Scattering albedo ω̇i Species i production rate per unit volume (kg/m3s) φ Equivalence ratio ρ Density (kg/m3) σ Stefan-Boltzmann constant (W/m2K4) 1 Copyright © 2017 ASME Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition GT2017 June 26-30, 2017, Charlotte, NC, USA