Numerical study of a trapezoidal bypass dual throat nozzle  

作　　者：Shuai HUANG Jinglei XU Kaikai YU Yangsheng WANG Ruifeng PAN Kuangshi CHEN Yuqi ZHANG 

机构地区：[1]State Key Laboratory of Mechanics and Control of Aeronautics and Astronautics Structures,Nanjing 210016,China [2]College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [3]Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing 210016,China

出　　处：《Chinese Journal of Aeronautics》2023年第3期42-62,共21页中国航空学报（英文版）

基　　金：support of the National Science and Technology Major Project,China(No.2019-II-0007-0027);the Defense Industrial Technology Development Program,China(No.JCKY2019605D001);the Advanced Jet Propulsion Creativity Center,Aero Engine Academy of China(No.HKCX2020-02-011);the Aeronautics Power Foundation,China(No.6141B09050383);the Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory of China,the Jiangsu Funding Program for Excellent Postdoctoral Talent,China(No.2022ZB214);the China Postdoctoral Science Foundation。

摘　　要：Bypass Dual Throat Nozzle(BDTN)is a novel type of fluidic thrust vectoring nozzle.To improve the infrared stealth performance of BDTN,a nozzle based on BDTN is proposed and numerically simulated.Each cross-section along the x-axis of the novel nozzle becomes a trapezoid,which is named“BDTN-TRA.”The main numerical simulation results show that BDTN-TRA can produce a thrust vectoring angle when the upper or lower bypass valve is open.The angle difference between the two conditions mentioned above is usually approximately 1°-2°.Even if the two bypasses are closed,BDTN-TRA can produce a small thrust vectoring angle at around 3°-5°.When the sidewall angle increases from 60°to 90°,the thrust coefficient and thrust vectoring angle under each work condition usually decrease.A larger aspect ratio indicates better performance.As the aspect ratio increases over 7.2,the performance of BDTN-TRA is quite close to that of BDTN with rectangular cross-sections at the same aspect ratio.These features will benefit the control and trimming for future aircraft design,especially for the flying wing layout aircraft.Last but not least,BDTN-TRA has a more extraordinary mixing performance compared with BDTN.The distributions of static temperature and axial velocity along the x-axis of BDTN-TRA with sidewall angle of 60°decrease faster than those of BDTN.When the total temperature of the inlet equals 1600 K,the static temperature difference between BDTN-TRA with sidewall angles of 60°and 90°is over 360 K at twice the length of the nozzle downstream of the nozzle exit,which is the reflection for excellent infrared stealth for the fighter.

关 键 词：Bypass dual throat nozzle Infrared stealth performance Mixing performance Trapezoidal cross-sections Thrust vectoring 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程]