对称双翼沉浮振动推进性能研究

Performance investigation of symmetrical plunging dual-foils propulsor

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。

Credit risk management of affiliated enterprises is very important for commercial banks. The implicit relationship of affiliated enterprises and their systemic credit risks require commercial banks to remedy credit management deficiencies and optimize the credit risk prevention mechanism, such as building affiliated enterprises credit risk management mechanisms, improving implicit relationship recognition ability; calculating the credit limits of affiliated enterprises, establishing affiliated enterprises credit risk warning mechanisms, building inter-bank infonnation exchange platform for affiliated enterprises, and strengthening the control measures of affiliated enterprises credit risk.