Numerical simulation of powder fuel mixing characteristics in supersonic circular combustion chamber

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-08-14 DOI:10.1016/j.ijheatfluidflow.2025.110002

Wenxue Han , Chunbo Hu , Junjie Li , Jiaxin Dong , Rong Lei , Chao Li

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Abstract

To explore the combustion organization of a powder-fueled scramjets, a numerical investigation was conducted to analyze powder fuel mixing characteristics in supersonic combustors. This study systematically investigates particle-air mixing dynamics in a supersonic circular cavity-based combustor through parametric variations of injection positions and swirl angles. Subsequently, an innovative partially-covered cavity configuration is proposed, and its mixing efficiency is evaluated under different injection angles. Numerical simulations demonstrated that in leading-edge injection configurations, the transverse jet-induced bow shock caused deflection of the X-shaped shockwave system toward the injection port in the annular combustor. Comparatively, direct particle injection into the cavity recirculation zone enhanced particle residence time; For upper-wall injection configurations, particle residence time (τ) in exhibited a positive correlation with swirl injection angle(θ), reaching τ = 9 ms at θ = 90°; In partially-covered cavity configurations, swirl injection of fuel enhanced particle residence, with optimal performance achieved at Lc = 35 mm and θ = 60°, and the particle mixing degree reached about 0.8.

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超声速圆形燃烧室粉末燃料混合特性的数值模拟

为了探索粉末燃料超燃冲压发动机的燃烧组织，对超声速燃烧室内粉末燃料混合特性进行了数值研究。本文通过改变喷射位置和旋流角的参数，系统地研究了超音速圆腔燃烧室中颗粒-空气的混合动力学。随后，提出了一种创新的部分覆盖腔结构，并对其在不同喷射角度下的混合效率进行了评估。数值模拟表明，在前缘喷射构型下，横向射流诱导的弓形激波使环形燃烧室内的x形激波系统向喷射口偏转。相比之下，将颗粒直接注入腔体再循环区可以延长颗粒的停留时间；对于上壁喷射构型，粒子停留时间（τ）与旋流喷射角（θ）呈正相关，在θ = 90°处达到τ = 9 ms；在部分覆盖型腔构型下，燃油旋流喷射增强了颗粒停留，在Lc = 35 mm、θ = 60°时性能最佳，颗粒混合度约为0.8。

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.