Abstract:
The present research focused on fluid-structure interaction effects on an adjustable single expansion ramp nozzle (SERN). Firstly, the accuracy of the computational fluid dynamics/computational structure dynamics (CFD/CSD) serially loosely coupled algorithm was validated. Then, the numerical procedure was adopted to investigate the interaction between the slide tail plate mounted at the end of SERN upper ramp and the surrounding flow-field. The fluid-structure interaction responses with different slide tail plate lengths (150mm, 180mm) and thicknesses (5mm, 7mm) were researched. The numerical results indicate that, the vibration of the slide tail plate, which is caused by the fluid-structure interaction effects, leads to the aerodynamic parameters fluctuation in nozzle.For the slide tail plate length of 180mm, the nozzle lift is reduced by 1.38%, and the pitch moment difference is increased by 16.9%. Under the same slide tail plate thickness (5mm), shorter slide tail plate possesses lower aerodynamic performance (with a decrease of 9.9% in lift) and better dynamic characteristic (with a decrease of 44.7% in response time). Under the same slide tail plate length (180mm), better aerodynamic and dynamic performances can be achieved when the slide tail plate thickness is increased, namely, the lift is increased by 0.98% when steady state is reached, the pitch moment difference is decreased by 10.5%, and the response time is reduced by 40.4%.
