Experimental investigation on dynamic diffusion characteristics and mechanism of liquid kerosene jet in supersonic high-enthalpy inflow

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-10-07 DOI:10.1016/j.fuel.2025.137040

Junlong Zhang , Naigang Cui , Guangjun Feng , Hongchao Qiu , Jiarui Zhang , Bohao Yan , Wen Bao

{"title":"Experimental investigation on dynamic diffusion characteristics and mechanism of liquid kerosene jet in supersonic high-enthalpy inflow","authors":"Junlong Zhang , Naigang Cui , Guangjun Feng , Hongchao Qiu , Jiarui Zhang , Bohao Yan , Wen Bao","doi":"10.1016/j.fuel.2025.137040","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the dynamic diffusion characteristics and mechanisms of liquid kerosene jets in supersonic high-enthalpy flows. Experiments were conducted on the ground directly connected scramjet combustor test rig with a high-speed schlieren system at injection pressures of 0.44 MPa, 0.60 MPa, and 0.78 MPa. The dynamic development of kerosene diffusion was analyzed based on the grayscale values of schlieren images, further revealing the underlying diffusion mechanisms. Results show that kerosene diffusion in supersonic high-enthalpy flows involves two stages: diffusion development and steady-state oscillation. Increasing injection pressure significantly accelerates diffusion and expands its range. Higher inertia lowers the main oscillation frequency but increases oscillation energy by enhancing turbulent energy exchange and phase-change disturbances. The oscillation mode shifts from small-scale, high-frequency fluctuations near the nozzle, caused by gas–liquid shear instability, to large-amplitude, low-frequency oscillations downstream due to phase-change expansion. The diffusion process and distribution result from the dynamic interplay of jet momentum, aerodynamic heating, and phase-change effects. These findings are significant for improving fuel mixing and combustion efficiency.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"406 ","pages":"Article 137040"},"PeriodicalIF":7.5000,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fuel","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0016236125027656","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}

引用次数: 0

Abstract

This study investigates the dynamic diffusion characteristics and mechanisms of liquid kerosene jets in supersonic high-enthalpy flows. Experiments were conducted on the ground directly connected scramjet combustor test rig with a high-speed schlieren system at injection pressures of 0.44 MPa, 0.60 MPa, and 0.78 MPa. The dynamic development of kerosene diffusion was analyzed based on the grayscale values of schlieren images, further revealing the underlying diffusion mechanisms. Results show that kerosene diffusion in supersonic high-enthalpy flows involves two stages: diffusion development and steady-state oscillation. Increasing injection pressure significantly accelerates diffusion and expands its range. Higher inertia lowers the main oscillation frequency but increases oscillation energy by enhancing turbulent energy exchange and phase-change disturbances. The oscillation mode shifts from small-scale, high-frequency fluctuations near the nozzle, caused by gas–liquid shear instability, to large-amplitude, low-frequency oscillations downstream due to phase-change expansion. The diffusion process and distribution result from the dynamic interplay of jet momentum, aerodynamic heating, and phase-change effects. These findings are significant for improving fuel mixing and combustion efficiency.

查看原文本刊更多论文

液体煤油射流在超声速高焓流中动态扩散特性及机理的实验研究

研究了液体煤油射流在超声速高焓流中的动态扩散特性及扩散机理。在地面直连式超燃冲压发动机燃烧室试验台上，采用高速纹影系统，在0.44 MPa、0.60 MPa和0.78 MPa的喷射压力下进行了实验。基于纹影图像的灰度值分析了煤油扩散的动态发展，进一步揭示了潜在的扩散机制。结果表明，煤油在超声速高焓流中的扩散过程分为扩散发展和稳态振荡两个阶段。增大喷射压力可显著加速扩散，扩大扩散范围。较高的惯量降低了主振荡频率，但通过增强湍流能量交换和相变扰动增加了振荡能量。振荡模式从喷嘴附近由气液剪切不稳定引起的小尺度高频波动转变为下游由相变膨胀引起的大振幅低频振荡。扩散过程和分布是射流动量、气动加热和相变效应的动态相互作用的结果。这些发现对提高燃料混合和燃烧效率具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.