Analysis on Mainstream Hydraulic Resistance coefficient of Cylinder Wall Groove Recoil Mechanism
PAN Xiao-bin1，SONG Yan-ming2，TAN Le-bin1
1.School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China；
2. Research and Development Center, Inner Mongolia North Heavy Industries Group Co., Ltd，Baotou 014033, Inner Mongolia, China
Abstract：Hydraulic resistance coefficient k1, which reflecting mainstream channel structure characteristic, is a key parameter in artillery recoil mechanism design. It can be initialized by experience when the channel structure is similar, otherwise it may be different completely. The cylinder wall groove recoil mechanism is studied in the paper. For obtaining the reasonable range of k1 in theoretic design, the influence parameters are studied. Based on the mainstream channel 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 channel section area ax, the piston force is calculated. And then，the coefficient k1 can be deduced from Bernoulli equation. And the method is validated with a mature recoil mechanism. According to the method，the influence of V and ax on k1 are studied. The coefficient k1 is increased gradually within a range when V and ax decrease 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 k1 should be 2.4~2.7.
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