The hydrodynamic performance and lift-drag ratio of the underwater glider affected the state of its own operation. Therefore, a three-dimensional physical model and a mathematical model of a certain type of underwater glider are established. According to the principles of aircraft performance characterization, the fluid dynamics method was used to simulate the pressure distribution of the underwater glider pressure field and the overall outflow field, under the attack angle from − 10° to 10° and the gliding speeds were 0.25 m/s, 0.5 m/s, 0.75 m/s, and 1 m/s. Finally, the drag experiment of this type of underwater glider is verified. It is concluded that as the gliding speed increases, the pressure of the high-pressure area of is increases, the pressure of the low-pressure area decreases, and the pressure difference resistance increases continuously. In the case of small attack angle (< 8°), the lift–drag ratio increases linearly with increase in attack angle, and when the attack angle reaches a certain degree (> 8°), the lift–drag ratio tends to decrease slightly with increase in attack angle. The maximum lift–drag ratio is produced at an attack angle about 8° and the underwater glider can get maximum hydrodynamic efficiency at this attack angle.

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水下滑翔机水动力性能及升阻比计算

水下滑翔机的水动力性能和升阻比影响着其自身的运行状态。因此，建立了某型水下滑翔机的三维物理模型和数学模型。根据飞行器性能表征原理，采用流体动力学方法模拟水下滑翔机压力场和整体流出场的压力分布，在-10°到10°的攻角下，滑翔速度为0.25 m /s、0.5 m/s、0.75 m/s 和 1 m/s。最后对该型水下滑翔机的阻力试验进行了验证。得出的结论是，随着滑翔速度的增加，高压区的压力增加，低压区的压力减小，压差阻力不断增加。在小攻角（< 8°）的情况下，升阻比随着攻角的增加而线性增加，当攻角达到一定程度（> 8°）时，升阻比有小幅下降的趋势随着攻角的增加。最大升阻比是在8°左右的攻角处产生的，水下滑翔机在这个攻角下可以获得最大的水动力效率。