Computational investigation on the formation of liquid-fueled oblique detonation waves

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2024-11-10 DOI:10.1016/j.combustflame.2024.113839

Wenhao Wang , Zongmin Hu , Peng Zhang

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引用次数: 0

Abstract

Utilizing a two-phase supersonic chemically reacting flow solver with the Eulerian-Lagrangian method implemented in OpenFOAM, this study computationally investigates the formation of liquid-fueled oblique detonation waves (ODWs) within a pre-injection oblique detonation wave engine operating at an altitude of 30 km and a velocity of Mach 9. The inflow undergoes two-stage 12.5° compression, followed by uniform mixing with randomly distributed n-heptane droplets before entering the combustor. The study examines the effects of droplet breakup models, gas-liquid ratios, and on-wedge strips on the ODW formation. Results indicate that under the pure-droplet condition, the ODW fails to form within the combustor, irrespective of the breakup models used. However, increasing the proportion of n-heptane vapor in the fuel/air mixture facilitates the ODW formation, because the n-heptane vapor rapidly participates in the gaseous reactions, producing heat and accelerating the transition from low- to intermediate-temperature chemistry. Additionally, the presence of on-wedge strips enhances ODW formation by inducing a bow shock wave within the combustor, which significantly increases the temperature, directly triggering intermediate-temperature chemistry and subsequent heat-release reactions, thereby facilitating the formation of ODW.

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液体燃料斜向爆轰波形成的计算研究

本研究利用 OpenFOAM 中采用欧拉-拉格朗日方法的两相超音速化学反应流求解器，计算研究了在高度为 30 千米、速度为 9 马赫的预喷射斜爆轰波发动机内形成的液体燃料斜爆轰波（ODW）。流入气流经过两级 12.5° 压缩，然后与随机分布的正庚烷液滴均匀混合，最后进入燃烧器。研究考察了液滴破裂模型、气液比和边条对 ODW 形成的影响。结果表明，在纯液滴条件下，无论使用何种破裂模型，ODW 都无法在燃烧器内形成。然而，增加燃料/空气混合物中正庚烷蒸汽的比例会促进 ODW 的形成，因为正庚烷蒸汽会迅速参与气态反应，产生热量并加速从低温化学反应到中温化学反应的转变。此外，楔形条带的存在通过在燃烧器内引发弓形冲击波来增强 ODW 的形成，弓形冲击波会显著提高温度，直接引发中温化学反应和随后的热释放反应，从而促进 ODW 的形成。

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

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.