Investigation on ignition enhancement characteristics by high-energy spark in a scramjet combustor under low flight Mach conditions

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2024-10-18 DOI:10.1016/j.ast.2024.109681

Huifeng Miao , Zhibo Zhang , Xing Zheng , Lan Zhang , Yun Wu , Yinghong li

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Abstract

Ignition characteristics of the long electrode distance high-energy spark igniter (LHSI) in a cavity-stabilized scramjet combustor at low flight Mach has been numerically and experimentally investigated and compared with those of conventional lower energy spark igniter (SI). The effects of ignition and injection schemes on ignition performance were analyzed and the enhancement of greater spark energy were verified. The results show that the widest ignition boundary of SI is observed when the kerosene is injected in far field due to the sufficient evaporation of kerosene droplets and the disturbance caused by upstream cavity. Due to the greater energy deposition by LHSI, the ignition performance is markedly improved and the ignition boundary of combustor is extended from 0.131–0.148 to 0.091–0.224 under the scheme of I1+L2. The increased energy deposition of spark plasma ignites more combustible mixture and enhances the initial combustion, leading to a larger high-temperature zone. This is crucial for ensuring the survival of the flame kernel against dissipation of airflow in the scramjet combustor operating at low fight Mach numbers due to the short duration of spark discharge.

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低飞行马赫数条件下高能火花在扰流喷气燃烧器中的点火增强特性研究

通过数值和实验研究了长电极距离高能火花点火器（LHSI）在低飞行马赫数空腔稳定扰流喷气燃烧器中的点火特性，并与传统低能火花点火器（SI）的点火特性进行了比较。分析了点火和喷射方案对点火性能的影响，并验证了更大火花能量的增强效果。结果表明，当煤油在远场注入时，由于煤油液滴的充分蒸发和上游空腔的干扰，SI 的点火边界最宽。在 I1+L2 方案下，由于 LHSI 的能量沉积更大，点火性能明显改善，燃烧器的点火边界从 0.131-0.148 扩大到 0.091-0.224 。火花等离子体能量沉积的增加点燃了更多的可燃混合气，增强了初始燃烧，从而形成更大的高温区。由于火花放电持续时间较短，这对于确保在低战斗马赫数下运行的扰流式喷气燃烧器中的火焰核心不受气流耗散的影响至关重要。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.