Effects of Inlet Flow on Combustion Characteristics of n-Heptane in a Micro-Combustor

被引：0
|
作者：
Chen X.-J. [1 ]
Yao R. [1 ]
Li J.-W. [1 ]
Feng M. [1 ]
Wang N.-F. [1 ]
机构：
[1] School of Aerospace Engineering, Beijing Institute of Technology, Beijing
来源：
Li, Jun-Wei (david78lee@gmail.com) | 2017年 / Journal of Propulsion Technology卷 / 38期
关键词：
Flame stability; Micro scale combustion; N-heptane droplet; Oxygen concentration; Sound vibration;
D O I：
10.13675/j.cnki.tjjs.2017.04.018
中图分类号：
学科分类号：
摘要：
In order to improve flame stability by changing inlet flow condition, following experiments were performed by using n-heptane as fuel in a micro-combustor of 4mm internal diameter to study effects of fuel flowrate and oxygen concentration on n-heptane droplet combustion in micro-tube. It was found that, when equivalence ratio is fixed at 0.9 and heptane flow rate increases from 10μL/min to 30μL/min, ignition time decreases and droplet drips. Then the film was formed, which was beneficial for ignition and flame stability. At a fixed inlet flow velocity of 0.33m/s, instantaneous jet flame appeared when pure oxygen was added to air and the flame didn't quench. Increasing oxygen concentration can reduce ignition time and improve flame stability. With increasing of oxygen concentration, flame length first increased and then decreased on the whole. Combustion sound-vibration exhibited low frequency characteristics and became most intense when oxygen concentration is 0.46. © 2017, Editorial Department of Journal of Propulsion Technology. All right reserved.
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页码：869 / 877
页数：8
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