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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Combustion characteristics of ethanol in a porous ceramic burner and ignition improved by enhancement of liquid-fuel intrusion in the pore with ultrasonic irradiation
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Combustion characteristics of ethanol in a porous ceramic burner and ignition improved by enhancement of liquid-fuel intrusion in the pore with ultrasonic irradiation

机译：多孔陶瓷燃烧器中乙醇的燃烧特性和通过超声辐射增强液体燃料侵入孔中而改善了点火

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摘要

Porous burner has a potential of lower-emission in a combustion of liquid fuels. However, it would be less attractive owing to its complexity and inefficiency in operations of the fuel vaporizing, in view of a practical application. To solve the problem described above, an ignition promoted system is proposed with taking advantages of characteristics of the porous burner. In this research, a fuel-vaporizing combustor equipped with porous burner made of Al2O3 and 1.7 MHz-ultrasonic oscillator was manufactured based on the calculating of a rate of fuel-penetration through the porous media. It was supposed that the fuel-penetration was derived from a capillary effects and the local pressurization of ultrasonic influenced by pore size and ultrasonic propagation. Combustion characteristics of ethanol fuel with manufactured combustor were investigated experimentally. At a term of startup, it is confirmed that vaporization of ethanol was promoted by ultrasonic and instantaneous ignition was achieved. Vaporizing combustion was sustained with recovering a part of its thermal radiation heat through the porous burner because Al2O3 had transparency for light which had near IR wavelength. Complete combustion was achieved within Al2O3 burner under the equivalence ratio ranged from 0.63 to 0.80, which showed that the combustion mode was similar to a premixing combustion. However, NO, concentration was comparatively high value, 59-97 ppm (O-2 0% base) in the stable combustion region because a heat value per surface area of the flame was increased due to a local high temperature zone caused by a shortened flame. (C) 2004 Elsevier Inc. All rights reserved.
机译：多孔燃烧器在液体燃料燃烧中具有较低排放的潜力。然而，鉴于其实际应用，由于其复杂性和燃料汽化操作效率低下，其吸引力将较小。为了解决上述问题，提出了一种利用多孔燃烧器的特性的点火促进系统。在这项研究中，基于通过多孔介质的燃料渗透速率的计算，制造了配备有由Al2O3制成的多孔燃烧器和1.7 MHz超声波振荡器的燃料蒸发燃烧器。据推测，燃料的渗透是由毛细作用和超声的局部压力引起的，孔径受超声尺寸和超声传播的影响。实验研究了制造的燃烧器对乙醇燃料的燃烧特性。在启动期间，证实了通过超声促进了乙醇的汽化并且实现了瞬时点火。由于Al 2 O 3对具有接近IR波长的光具有透明性，因此通过通过多孔燃烧器回收一部分热辐射热量来维持汽化燃烧。在Al2O3燃烧器内，当量比在0.63至0.80范围内可实现完全燃烧，这表明燃烧模式类似于预混燃烧。但是，NO浓度相对较高，在稳定的燃烧区域中为59-97 ppm（O-2 0％碱），这是因为由于缩短所引起的局部高温区而增加了火焰单位表面积的热值火焰。 （C）2004 Elsevier Inc.保留所有权利。

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