Large eddy simulation on the interaction effect of shock waves induced by wall ramps on strut flame

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-09-27 DOI:10.1016/j.ast.2025.111008

Zi-jian Zhao, Chao-yang Liu, Wei Huang

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引用次数: 0

Abstract

Struts are a commonly used structure in scramjet engines. Their advantage lies in their ability to serve as both fuel injectors and flame stabilizers under high-speed conditions. In a strut-based combustor, there exist complex shock-wave structures and shock-wave-flame interactions. In this work, wall ramps were placed on the walls of the strut-based combustor to study the impact of oblique shock waves on the strut-jet flame. Three ramp-installation schemes were designed, and three-dimensional transient numerical studies were carried out using large-eddy simulation based on the OpenFOAM platform. The large-scale vortex structures were captured, and the interaction between the oblique shock waves induced by the ramps and the strut-jet flame was analyzed from the perspective of shock wave and vortex interactions. The dimensions of the struts and ramps were customized. The numerical results indicate that the shock waves induced by the ramps can significantly affect the strut-jet flame. Under strong compression, large-scale vortex structures are formed, and the flame mixing layer expands, promoting the mixing of the fuel jet and air, thus enhancing combustion. The stabilization mechanism of the strut-jet flame under the influence of the ramp-induced shock waves was analyzed. Additionally, a mechanism analysis of the flow-blockage phenomenon occurring in the simulation study was conducted. This research contributes to a better understanding of the flow-combustion phenomena occurring within the strut-based combustor, providing a certain theoretical basis and guiding solutions for the design and research of strut-based combustors in scramjet engines.

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壁面斜坡引起的激波对支板火焰相互作用的大涡模拟

支板是超燃冲压发动机中常用的结构。它们的优势在于在高速条件下既能充当燃油喷射器又能充当火焰稳定器。在支柱燃烧室中，存在着复杂的激波结构和激波-火焰相互作用。本文在支板燃烧室壁面放置壁面坡道，研究斜激波对支板射流火焰的影响。设计了三种坡道安装方案，并基于OpenFOAM平台进行了大涡模拟三维瞬态数值研究。捕获了大尺度涡结构，从激波和涡相互作用的角度分析了斜道诱导的斜激波与支柱射流火焰的相互作用。支柱和坡道的尺寸是定制的。数值计算结果表明，坡面所产生的激波对支柱射流火焰有显著影响。在强压缩下，形成大尺度涡结构，火焰混合层膨胀，促进燃油射流与空气混合，从而增强燃烧。分析了斜面激波作用下支撑射流火焰的稳定化机理。并对模拟研究中出现的流阻现象进行了机理分析。本研究有助于更好地理解基于支杆的燃烧室内部发生的流动燃烧现象，为超燃冲压发动机基于支杆的燃烧室的设计和研究提供一定的理论依据和指导性解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.