Title :
A numerical study of subsonic jet mixing enhancement via piston synthetic jets
Author :
Mengjie Wang ; Eriqitai ; Qiang Wang
Author_Institution :
Sch. of Energy & Power Eng., Beihang Univ., Beijing, China
Abstract :
Noise reduction and infrared (IR) signature reduction are the two main benefits from aero-engine exhaust plumes mixing enhancement. The mixing enhancement of a high temperature (800 K) and high speed (Mj = 0.9) axisymmetric plume subjected to a pair of piston synthetic jets (PSJ) with the mode number of 1 is investigated by using dynamic mesh model based RANS numerical methods. The numerical validations are conducted on the cases of Crittenden & Glezer´s free PSJ [1] flows and Briges & Wernet´s free jet flows [2]. The flow pattern of the actuated jet is investigated and the physical mechanism of PSJ actuated jet mixing enhancement is analyzed. Meanwhile, the impact of the exit diameter, and the frequency of PSJ actuator and injection angle to the mixing are investigated and the results indicate that all the factors play an important role on jet mixing enhancement in the selected conditions.
Keywords :
Navier-Stokes equations; aerospace engines; exhaust systems; jets; mixing; numerical analysis; pistons; subsonic flow; IR signature reduction; PSJ actuated jet mixing enhancement; PSJ actuator frequency; RANS numerical method; aeroengine exhaust plume mixing enhancement; dynamic mesh model; exit diameter; flow pattern; free PSJ flow; free jet flow; high-speed axisymmetric plume; high-temperature axisymmetric plume; infrared signature reduction; injection angle; noise reduction; numerical study; piston synthetic jets; subsonic jet mixing enhancement; Jet Mixing; Numerical Simulation; Piston Synthetic Jets;
Conference_Titel :
Fluid Machinery and Fluid Engineering, 2014 ISFMFE - 6th International Symposium on
Print_ISBN :
978-1-84919-907-0
DOI :
10.1049/cp.2014.1205
