单边膨胀喷管移动板的流固耦合研究

Fluid-structure interaction study of slide tail plate of single expansion ramp nozzle

验证了基于CFD/CSD(计算流体动力学/计算结构动力学)串行双向耦合算法的准确性,并针对单边膨胀喷管上膨胀面末端移动板的可调方案,研究了不同移动板长度(150,180mm)与厚度(5,7mm)下的流固耦合响应.结果表明:流固耦合引起的振动会造成喷管气动参数的波动,移动板长度为180mm时,达到稳定后,与常规不计流固耦合的情况相比,喷管的升力下降1.38%,冷热态俯仰力矩差增加16.9%;移动板厚度相同时(5mm),较短移动板的气动性能较差,但动态性能较好:升力减小9.9%,而响应时间缩短44.7%;当移动板长度相同时(180mm),较厚的移动板同时拥有好的气动与动态特性:稳态时升力提高0.98%,冷热态俯仰力矩差减小10.5%,且响应时间减小40.4%.

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 180 mm,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 theresponse time is reduced by 40.4%.