目的 研究导弹在意外点火时排气道的力学性能及导弹发射的安全性,对排气道的极限承压性能进行研究.方法 建立排气道的极限承压的仿真模型,通过水压试验及发射试验,获取排气道不同种试验方式下的极限承压数据.结果 排气道在导弹正常发射时承压设计值为0.3MPa.极限承压仿真试验过程中,排气道在受到0.5MPa压强时,所受应力超过材料最大抗拉极限.水压试验过程中,排气道受0.58MPa压强时,其结构发生破坏.意外点火试验过程中,排气道所受最大压强值为0.24MPa.结论 排气道的极限承压能力可以满足正常发射及意外点火的发射要求,排气道的设计裕量充足.%Objective To study limit pressure property of exhaust chimney, mechanical property of the exhaust chim-ney in unexpected ignition of missile and the safety of missile launching.Methods A simulation model for limit pressures of exhaust chimney was built. Water pressure experiment and launching experiment were carried out to obtain date on limit pressure of the exhaust chimney in different types of test.Results The design pressure of the exhaust chimney in abnormal launching was 0.3 MPa. The stress of the exhaust chimney surpassed the maximum tensile limit was 0.5 MPa. The structure was destroyed at 0.58 MPa in the water pressure experiment. The limit pressure of the exhaust chimney was 0.24 MPa in unexpected ignition.Conclusion The limit pressure of exhaust chimney meets the requirements of normal launching and unexpected ignition. The design allowance of the exhaust chimney is enough.
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