Fluent筒壁沟槽式火炮驻退机流场仿真分析
毕业论文关键词：驻退机；液压阻力系数；后坐阻力；流场仿真
毕业设计说明书外文摘要
Title Analysis on Mainstream Hydraulic Resistance coefficient of Cylinde Wall Groove Recoil Mechanism
Abstract
Hydraulic resistance coefficient ,which reflecting mainstream channel structure characteristic,is a key parameter in artillery recoil mechanism design.It can be initialized by experience when the chanel structure is similar,otherwise itmay be different completely,The cylinder wall groove recoil veloil mechanism is studied in the paper. Forobtaining the reasonable range of in theoretic design ,theinfluence parameters are studied. Based on the mainstream chanel structure analysis and reasonable simplification,by fixing the piston and rod,translating recoil velocity V by inlet velocity V’and setting free outlet, the equivalent flow field model is set up and simulated in Fluent.Under the certain condition of inlet velocity v’and the chanel section area ax, the piston force is calculated. And then,the coefficient can be deduced from Bernoulli equation.And the method is validated within a range when V and ax decreace during recoil.Under the condition of the recoil mechanism parameters in the paper, and based on the recoil force comparison of simulation and test, the reasonable range of should be 2.9～3.6.
Keywords: recoil mechanism;hydraulic resistance coefficient;recoil force;flow field simulation
目 次
1引言 1
2 筒壁沟槽式驻退机结构 1
3流场分析 2
4 筒壁沟槽式驻退机主流系数分析 3
4.1 入流速度和流道面积的影响 3
4.2 试验验证 4
5 结构设计 6
5.1 驻退后坐分析 6
5.2 自由后坐分析与计算7
5.3 驻退机沟槽正面设计 10
结论 17
致谢 18
参考文献19
附录A 21
附录B 22
1 引言
反后坐装置是火炮最核心的部件，火炮发射过程当中炮身上所承受的巨大冲击力经过反后坐装置缓冲后再作用于炮架上，从而缓解了火炮机动性和威力之间的矛盾。而这其中，驻退机是消耗后坐能量以及控制炮身平稳后坐的关键部件。驻退机的结构形式主要有活塞沟槽式、节制杆式、筒壁沟槽式等结构形式，一般都通过活塞挤压工作腔室中的驻退液通过孔口提供后坐阻力。这其中节制杆式驻退机因为结构简单、动作确实可靠儿广泛应用于各种类的制式火炮当 。
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