Investigation on Flow Characteristics of SVC Nozzles
- سال انتشار: 1397
- محل انتشار: دوماهنامه مکانیک سیالات کاربردی، دوره: 11، شماره: 2
- کد COI اختصاصی: JR_JAFM-11-2_004
- زبان مقاله: انگلیسی
- تعداد مشاهده: 276
نویسندگان
Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, School of Power and Energy, Northwes
Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, School of Power and Energy, Northwes
Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shan Xi Province, ۷۱۰۰۷۲, China
Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine, School of Power and Energy, Northwestern Polytechnical University, Xi’an, Shan Xi Province, ۷۱۰۰۷۲, China
چکیده
Shock vectoring control (SVC) is an important method of fluidic thrust vectoring (FTV) for aero-engine exhaust system. It behaves better on nozzle of high pressure ratio, and is considered as an alternative TV technology for a future aero-engine with high thrust-to-weight ratio. In this paper, the flow mechanism and vector performance, including the vector angle (δp) and thrust coefficient (Cfg), of ۲D and axisymmetric SVC nozzles were investigated after the validation of turbulence models by experimental data. The influence of aerodynamic parameters, e.g. nozzle pressure ratio (NPR), secondary pressure ratio (SPR) and free-stream Ma number (M∞) on flow characteristics and vector performance were studied numerically, and results show that unbalanced pressure distributions on nozzle internal walls determine δp, while shock waves dominate thrust loss, referring to Cfg. The “pressure release mechanism” of an axisymmetric SVC nozzle causes vector angle about ۱۶.۵۴% smaller than that of a ۲D SVC nozzle at NPR of ۶. The induced shock wave interacts with nozzle upper wall at SPR of ۱.۵, and results in the δp of a ۲D SVC nozzle ۱۲% smaller. A new parameter (Fy,modi) of side-force was redefined for free-stream conditions, taking the pressure distributions on nozzle external walls into account. Results indicate that pressure connection on nozzle external walls of an axisymmetric SVC nozzle causes vector performance better at M∞ > ۰.۳ and the δp is about ۱۱.۲% larger at transonic conditions of M∞ of ۰.۹ and ۱.۱.کلیدواژه ها
SVC, Transverse injection, Vector performance, Aerodynamic parameters, Flow controlاطلاعات بیشتر در مورد COI
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