摘要
在水下高速航行的弹体表面的局部低压区会形成空泡,而空泡的形成会对弹体周围的流场造成很大的影响.当弹体在一定攻角下航行时,弹体周围的流场非常复杂.文中采用S inghal提出的空泡模型,利用有限容积法对三维弹体的外流场进行了数值模拟.将零攻角下的数值结果与文献中的经典实验结果进行了比较,二者数据符合较好.利用此方法对5种小攻角进行了研究,比较分析了5种攻角下弹体表面的空泡分布和压力系数分布,并通过数值积分的方法得出弹体在不同攻角下的侧向力和力矩.计算结果表明,当攻角大于2.5°后,侧向力和力矩会大幅度的增加.文中结论可供水下垂直发射与水下导弹的研究与设计参考.
Vapor cavitation occurs in low pressure areas on the surface of high speed underwater projectiles, greatly effecting flow fields around the projectiles. These flow fields become very complicated when the projectile moves with certain attack angles. In this paper simulations of flow fields around a 3-D projectile were made with the cavi- tation model suggested by Singhal, and the finite volume method. The numerical results for zero attack angle agree well with those found in related documents. Thereafter, simulations were conducted for five different small attack angles. The distribution of cavity and pressure coefficients on the projectile surface were compared and analyzed. Also transverse forces and momentums on the projectile for different attack angles were derived by numerical integration. Simulations show that transverse forces and momentum on projectiles increase quickly when the attack angle is larger than 2.5°. The conclusions in this paper will be helpful in design and research of underwater projectiles and underwater vertical launch.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2007年第7期738-742,共5页
Journal of Harbin Engineering University
基金
黑龙江省自然科学基金资助项目(A0210)
关键词
空泡
水下导弹
攻角
侧向力
cavitation
underwater projectile
attack angle
transverse force
