Experimental and numerical investigation of thrust characteristics in a bypass dual throat nozzle with dagger-shaped deflection component

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-09-22 DOI:10.1016/j.ast.2025.110961

Han Dong , Jinglei Xu , Shuai Huang , Jingqing Chen , Bingsong Lan , Ruifeng Pan , Yuqi Zhang

{"title":"Experimental and numerical investigation of thrust characteristics in a bypass dual throat nozzle with dagger-shaped deflection component","authors":"Han Dong , Jinglei Xu , Shuai Huang , Jingqing Chen , Bingsong Lan , Ruifeng Pan , Yuqi Zhang","doi":"10.1016/j.ast.2025.110961","DOIUrl":null,"url":null,"abstract":"<div><div>A novel BDTN-SVTOL with dagger-shaped deflection component, featuring simplified structural design for efficient cruise and short/vertical takeoff and landing (SVTOL) thrust vectoring (TV) with a single nozzle system, is developed, numerically simulated, and experimentally evaluated to investigate the thrust characteristics. The dagger-shaped deflection component serves as the critical flow-control element for BDTN-SVTOL, enabling mainstream large deflection exceeding 90° A parametric optimization framework was established for the deflection surface of dagger-shaped deflection component, quantifying the relationship between critical geometric parameters and thrust characteristics while maximizing angular coverage. A decoupled methodology for profile optimization is proposed guided by the distinct near-wall flow characteristics, and the optimized configuration achieves a TV angle greater than 95° while maintaining a vertical thrust coefficient (<em>c<sub>f</sub></em><sub>y</sub>) above 0.90 across all operating conditions, matching the SVTOL performance of Three-Bearing Swivel Nozzle (3BSN) while integrating multi-directional deflection capability and simpler mechanical architecture. The experimental model demonstrates dual-mode operational capabilities in wind tunnel tests, capturing nozzle internal flow field schlieren morphology while validating CFD simulation accuracy. In normal flight mode, the nozzle achieves a thrust vector angle exceeding 15° which can enhance high maneuverability. In SVTOL mode, compared to the conventional BDTN with crescent-shaped deflectors exhibiting TV angles of 60°and <em>c<sub>f</sub></em><sub>y</sub> of 0.7, the nozzle with dagger-shaped deflector demonstrates enhanced performance through more stable single-channel design, achieving TV angles exceeding 90° and thrust coefficients over 0.90, thereby overcoming limitations in angular deflection efficiency and the energy dissipation.</div></div>","PeriodicalId":50955,"journal":{"name":"Aerospace Science and Technology","volume":"168 ","pages":"Article 110961"},"PeriodicalIF":5.8000,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Aerospace Science and Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1270963825010247","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, AEROSPACE","Score":null,"Total":0}

引用次数: 0

Abstract

A novel BDTN-SVTOL with dagger-shaped deflection component, featuring simplified structural design for efficient cruise and short/vertical takeoff and landing (SVTOL) thrust vectoring (TV) with a single nozzle system, is developed, numerically simulated, and experimentally evaluated to investigate the thrust characteristics. The dagger-shaped deflection component serves as the critical flow-control element for BDTN-SVTOL, enabling mainstream large deflection exceeding 90° A parametric optimization framework was established for the deflection surface of dagger-shaped deflection component, quantifying the relationship between critical geometric parameters and thrust characteristics while maximizing angular coverage. A decoupled methodology for profile optimization is proposed guided by the distinct near-wall flow characteristics, and the optimized configuration achieves a TV angle greater than 95° while maintaining a vertical thrust coefficient (c_f_y) above 0.90 across all operating conditions, matching the SVTOL performance of Three-Bearing Swivel Nozzle (3BSN) while integrating multi-directional deflection capability and simpler mechanical architecture. The experimental model demonstrates dual-mode operational capabilities in wind tunnel tests, capturing nozzle internal flow field schlieren morphology while validating CFD simulation accuracy. In normal flight mode, the nozzle achieves a thrust vector angle exceeding 15° which can enhance high maneuverability. In SVTOL mode, compared to the conventional BDTN with crescent-shaped deflectors exhibiting TV angles of 60°and c_f_y of 0.7, the nozzle with dagger-shaped deflector demonstrates enhanced performance through more stable single-channel design, achieving TV angles exceeding 90° and thrust coefficients over 0.90, thereby overcoming limitations in angular deflection efficiency and the energy dissipation.

查看原文本刊更多论文

匕首形偏转构件旁路双喉喷管推力特性的实验与数值研究

为了实现高效巡航和短/垂直起降（SVTOL）推力矢量（TV）单喷管系统，设计了一种新型匕首形偏转部件的BDTN-SVTOL，并对其推力特性进行了数值模拟和实验评估。匕首形偏转部件作为BDTN-SVTOL的关键流控元件，实现主流大于90°的大偏转。建立了匕首形偏转部件偏转面参数化优化框架，量化了关键几何参数与推力特性之间的关系，同时最大化了角度覆盖。基于不同的近壁流动特性，提出了一种解耦优化方法，优化后的喷嘴在所有工况下的TV角均大于95°，垂直推力系数（cfy）均在0.90以上，与三轴承旋转喷嘴（3BSN）的SVTOL性能相当，同时集成了多向偏转能力和更简单的机械结构。该实验模型在风洞测试中展示了双模操作能力，在验证CFD模拟精度的同时捕获了喷嘴内部流场纹影形态。在正常飞行模式下，喷管的推力矢量角超过15°，提高了高机动性。在SVTOL模式下，与具有60°TV角和0.7 cfy的新月形偏转板的传统BDTN相比，具有匕首形偏转板的喷嘴通过更稳定的单通道设计获得了更好的性能，实现了超过90°的TV角和超过0.90的推力系数，从而克服了角偏转效率和能量消耗的限制。

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

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.