物理学报Issue(17)：1-9,9.DOI:10.7498/aps.63.178802
介观尺度下活性炭微粒的光镊捕捉、点火和扩散燃烧特性研究
Trap, ignition, and diffusion combustion characteristics of active carb on micro-particles at a meso-scale studied by optical tweezers
摘要
Abstract
To study combustion characteristics of solid fuels at the meso-scale, this paper presents a study on trap, ignition, and diffusion combustion characteristics of active carbon micro-particles at a meso-scale by optical tweezers. In the meso-scale combustor, minimum trap power for active carbon micro-particles with a diameter of 7.0 µm is 3.2 mW, and the trap velocity is in the range of 103.7-70.0 µm/s. The active carbon micro-particles in static air flow can be ignited when the laser power is 3.2 mW. The effective diameter, perimeter, area and roundness of the particles have little effect on the minimum power for ignition. The ignition delay time is∼48 ms for active carbon micro-particles with a diameter of 3.0 µm, and it will decrease till below 6 ms with increasing laser power. After ignited, the active carbon micro-particle shows flameless combustion first. The diffusion combustion velocity agrees with the diameter square linear-relationship, and the velocity is of 15.0-8.0 µm/s. Then the active carbon micro-particle continues to carry out combustion reactions with bright flames repetitiously, and the flash frequency is 29.1 Hz. For the active carbon micro-particle with a diameter of 3.0 µm, it can burn out thoroughly in an overall time ∼0.648 s (including the heating and combustion processes). Results demonstrate that ignition of the active carbon micro-particle heated by high power density laser belongs to the combined ignition mode. Before volatile matter precipitates, the active carbon micro-particle is ignited heterogeneously and carries out a flameless combustion. However, after the volatile components are precipitated, it is ignited homogeneously, and the ombustion flame always shows a spheried shape.关键词
微燃烧/光镊/固体燃料/点火Key words
micro-combustion/optical tweezers/solid fuels/ignition引用本文复制引用
黄雪峰,李盛姬,周东辉,赵冠军,王关晴,徐江荣..介观尺度下活性炭微粒的光镊捕捉、点火和扩散燃烧特性研究[J].物理学报,2014,(17):1-9,9.基金项目
国家自然科学基金(批准号:51276053,51006029)、浙江省自然科学基金(资助号：LY14E060002)和浙江省中青年学科带头人学术攀登项目(批准号：pd2013158)资助的课题 （批准号:51276053,51006029）
