Research on mixing characteristics of scramjet combustor equipped with strut injector

IF 6.9 2区工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2023-09-06 DOI:10.1016/j.applthermaleng.2023.121527

Fuxu Quan, Juntao Chang, Chen Kong, Chengkun Lv, Guangwei Wu

{"title":"Research on mixing characteristics of scramjet combustor equipped with strut injector","authors":"Fuxu Quan, Juntao Chang, Chen Kong, Chengkun Lv, Guangwei Wu","doi":"10.1016/j.applthermaleng.2023.121527","DOIUrl":null,"url":null,"abstract":"<div>The combustor is the core component of the scramjet. The mixing of fuel and oxidizer is an important prerequisite for the efficient operation of the combustor. A thin strut configuration with supplemental oxygen at the trailing edge is proposed to enhance the mixing of fuel and oxidizer. In this paper, a series of large eddy simulations are carried out at the combustor inlet conditions of Ma = 2.8, Tt = 1680 K, and Pt = 1.87 MPa to optimize the fuel injection strategy and clarify how supplementation oxygen affects the mixing performance. The results show that injecting fuel from the upstream nozzle will form a more complex flow separation region and a stronger vortex, and increase the mixing efficiency from 0.18 to 0.26 compared with the downstream nozzle. The diffusion of fuel interacts strongly with vortexes. A unique separation zone was observed near the upstream nozzle for the first time. Compared with a single nozzle of fuel injection, the coordinated injection of two nozzles can increase the dimensionless fuel penetration depth by 30%. Supplementing oxygen at the trailing edge of the strut can significantly increase the turbulence to generate a variety of vortices and enhance the mixing of fuel and oxidizer, and the mixing efficiency can be increased by more than 20%.</div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"236 ","pages":"Article 121527"},"PeriodicalIF":6.9000,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Thermal Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1359431123015569","RegionNum":2,"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

The combustor is the core component of the scramjet. The mixing of fuel and oxidizer is an important prerequisite for the efficient operation of the combustor. A thin strut configuration with supplemental oxygen at the trailing edge is proposed to enhance the mixing of fuel and oxidizer. In this paper, a series of large eddy simulations are carried out at the combustor inlet conditions of Ma = 2.8, T_t = 1680 K, and P_t = 1.87 MPa to optimize the fuel injection strategy and clarify how supplementation oxygen affects the mixing performance. The results show that injecting fuel from the upstream nozzle will form a more complex flow separation region and a stronger vortex, and increase the mixing efficiency from 0.18 to 0.26 compared with the downstream nozzle. The diffusion of fuel interacts strongly with vortexes. A unique separation zone was observed near the upstream nozzle for the first time. Compared with a single nozzle of fuel injection, the coordinated injection of two nozzles can increase the dimensionless fuel penetration depth by 30%. Supplementing oxygen at the trailing edge of the strut can significantly increase the turbulence to generate a variety of vortices and enhance the mixing of fuel and oxidizer, and the mixing efficiency can be increased by more than 20%.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

支杆喷射器超燃冲压发动机燃烧室混合特性研究

燃烧室是超燃冲压发动机的核心部件。燃料与氧化剂的混合是燃烧室高效运行的重要前提。为了提高燃料和氧化剂的混合性能，提出了在尾缘添加氧气的薄支板结构。本文在Ma = 2.8, Tt = 1680 K, Pt = 1.87 MPa的燃烧室进口条件下进行了一系列大涡模拟，优化了燃油喷射策略，阐明了补氧对混合性能的影响。结果表明:与下游喷嘴相比，上游喷嘴喷射燃料将形成更复杂的流动分离区域和更强的涡流，混合效率从0.18提高到0.26;燃料的扩散与涡旋相互作用强烈。首次在上游喷嘴附近观察到独特的分离区。与单喷嘴燃油喷射相比，双喷嘴协同喷射可使燃油无量纲穿透深度提高30%。在支板尾缘补氧可以显著增加紊流，产生多种涡旋，增强燃料与氧化剂的混合，混合效率可提高20%以上。

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分钟内获得全文去求助

来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.