Dynamic characteristics and application of dual throat fluidic thrust vectoring nozzle  

作　　者：Buxian XU Dongping HU Lihao FENG 

机构地区：[1]Fluid Mechanics Key Laboratory of Ministry of Education,Beihang University,Beijing 100191,China [2]State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment,Dongfang Electric Corporation Dongfang Turbine Co.,LTD,Deyang 618000,China

出　　处：《Chinese Journal of Aeronautics》2024年第9期85-99,共15页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.U2141253 and 11721202).

摘　　要：Thrust vectoring technology plays an important role in improving the maneuverability of aircraft.In order to overcome the disadvantages of mechanical thrust vectoring nozzles,such as complications of structure and significant increases in weight and cost,fluidic thrust vectoring noz-zles are proposed.Dual Throat fluidic thrust vectoring Nozzle(DTN)has received wide attention due to its excellent thrust vectoring efficiency and minimal thrust loss.In this study,three-dimensional unsteady numerical simulations of a single axisymmetric DTN are conducted first to analyze its dynamic response.Then the pitch and yaw control characteristics of DTN equipped on a flying-wing aircraft are investigated.It is found that the dynamic response will experience three stages:rapid-deflecting stage,oscillating stage,and steady stage.A complete recirculation zone forms at the end of the rapid-deflecting stage,which pushes the primary flow to attach to the wall opposite the secondary injection.Meanwhile,the exhaust flow is deflected.In terms of DTN's appli-cation,the DTN equipped on the flying-wing aircraft is capable of providing effective pitch and yaw moments at all angles of attack and Mach numbers.In addition,continuous pitch and yaw moments can be obtained by adjusting the secondary mass flow ratios.The control moment is gen-erated due to the asymmetrical pressure distribution of nozzle surface,which is mainly contributed by the pressure decrease on the secondary injection surface.Moreover,the DTN equipped on the flying-wing aircraft has a relatively high thrust vectoring efficiency of around 5°/%and a thrust coefficient of around 0.95 when nozzle pressure ratio equals 4.These results provide an important theoretical basis for the practical application of DTN.

关 键 词：Dual throat nozzle Dynamic response charac-teristic Flowcontrol Flying-wing aircraft 

分 类 号：V233.7[航空宇航科学与技术—航空宇航推进理论与工程]