受限空间内正庚烷-空气两相斜爆轰的模拟研究

Numerical Study on Two-Phase n-Heptane/Air Oblique Detonation Wave in Confined Space

摘要

液体燃料具有能量密度更高、储存更方便的优势,仍然是斜爆轰发动机的主要燃料选择.使用欧拉-拉格朗日方法模拟了部分预汽化正庚烷-空气混合物诱导的斜爆轰波,并考虑了壁面的限制作用,研究了液滴直径对斜爆轰波结构的影响.结果表明,对于两相正庚烷诱导斜爆轰波结构,斜爆轰波处于非稳态振荡状态,起爆位置的振荡幅度随着液滴直径的增大先减小后增大.受限空间下斜爆轰波会在上壁面反射形成马赫反射结构,斜爆轰波的振荡状态会影响马赫杆位置的变化.但当马赫杆发展较充分时,斜爆轰波的振荡状态对马赫杆移动轨迹的影响较小.

Abstract

Liquid fuels remain the primary choice for oblique detonation engines due to their superior energy density and storage convenience. The Euler-Lagrange method was employed to simulate oblique detonation waves induced by partially pre-vaporized n-heptane/air mixtures, with the confinement effects of the walls taken into detailed account. The results indicate that for two-phase n-heptane induced oblique detonation wave structures, the wave exhibits an unsteady oscillating state. The oscillation amplitude of the initiation position first decreases and then increases with increasing droplet diameter. In confined space, the oblique detonation wave reflects off the upper wall, resulting in a Mach reflection structure. The oscillation state of the oblique detonation wave would influence the position of the Mach stem. However, when the Mach stem is sufficiently developed, the influence of the oscillation on its trajectory becomes negligible.

关键词

两相斜爆轰波 / 马赫杆 / 液滴直径 / 部分预汽化

Key words

two-phase oblique detonation wave / Mach stem / droplet diameter / partial pre-vaporization

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基金资助

国家自然科学基金资助项目(52076194)