Generation and Propagation Characteristics of an Auto-Ignition Flame Kernel Caused by the Oblique Shock in a Supersonic Flow Regime

被引：2

作者：

Xi, Wenxiong ^{[1
]}

Xu, Mengyao ^{[1
]}

Liu, Chaoyang ^{[2
]}

Liu, Jian ^{[1
]}

Sunden, Bengt ^{[1
,3
]}

机构：

[1] Cent South Univ, Sch Aeronaut & Astronaut, Changsha 410012, Peoples R China

[2] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410015, Peoples R China

[3] Lund Univ, Dept Energy Sci, POB 118, SE-22100 Lund, Sweden

来源：

ENERGIES | 2022年 / 15卷 / 09期

基金：

中国国家自然科学基金;

关键词：

auto-ignition; supersonic flow; initial flame kernel; oblique shock; recirculating region; JET; COMBUSTION; STABILIZATION; INJECTION;

D O I：

10.3390/en15093356

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The auto-ignition caused by oblique shocks was investigated experimentally in a supersonic flow regime, with the incoming flow at a Mach number of 2.5. The transient characteristics of the auto-ignition caused by shock evolvements were recorded with a schlieren photography system, and the initial flame kernel generation and subsequent propagation were recorded using a high-speed camera. The fuel mixing characteristics were captured using NPLS (nanoparticle-based planar laser scattering method). This work aimed to reveal the flame spread mechanism in a supersonic flow regime. The effects of airflow total temperature, fuel injection pressure, and cavity length in the process of auto-ignition and on the auto-ignitable boundary were investigated and analyzed. From this work, it was found that the initial occurrence of auto-ignition is first induced by oblique shocks and then propagated upstream to the recirculation region, to establish a sustained flame. The auto-ignition performance can be improved by increasing the injection pressure and airflow total temperature. In addition, a cavity with a long length has benefits in controlling the flame spread from the induced state to a sustained state. The low-speed recirculating region created in the cavity is beneficial for the flame spread, which has the function of flame-holding and prevents the flame from being blown away.

引用

页数：14

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