摘要
该文利用非定常双时间NS方程的预处理方法对摆翼地效推进器进行了推力和推进性能的分析,结果显示沉浮振动的推力和效率与速度的变化关系表现出一致性;固定频率,改变速度,发现推力和效率存在极大值点;随着频率增大,极大值点右移。最大推力和效率的动力攻角为6o-9o,利用速度矢量图和压力云图显示了分离涡的输运和扩散,再一次展示了地效的存在。
The preconditioning method for unsteady dual-time NS equations is employed to evaluate and analyze the performance of symmetrical plunging dual-foils. The calculated result shows that the trend of relations between efficiency and thrust versus speed agreed well with previous experimental measurement. For a fixed frequency and changing speed, the maximum thrust and efficiency may be obtained and with the increment of fixed frequency the points of maximum thrust and efficiency are shifted rightward. The danamic angles of attack corresponding to the points of maximum thrust and efficiency fall in the interval between 6 to 9 degrees. The transporation and diffusion of vortex separation are showed by using the vecdor graph and pressure nephogram and in which the wing-in-ground effect is revealed and resulted in the increment of averageci thrust and efficiency
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2009年第5期647-653,共7页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金项目(40576047)
关键词
NS方程
翼形振动
地效推进技术
NS equations
symmetrical plunging dual-foils
ground effect propulsion
