Internal ballistics simulatin on and improving of rod-less cylinder cold launching device
YAO Lin1,MA Dawei1,REN Jie1,WEI Longtao2,LI Ya1
1.School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China；
2.Aerospace Long-March International Trade ,Beijing 100039,China
In order to achieve a type of new ejection device with low acceleration,long travel-length and small size,a kind of high-pressure pneumatic missile cold ejection device with rod-less cylinder was designed.The real gas state equation—‘Redlich-Kwong’ equation was used as a theoretical basis.Based on the ‘RK’ state equation,the mathematical expressions of specific thermodynamic energy and specific enthalpy were deduced and a pneumatic internal ballistics equation was proposed.The variation of thermodynamic and kinematic parameters were obtained in the process of catapult.The results show that the mass flow rate from the high pressure chamber to low pressure chamber raises by 52.9% compared with the single valve scheme.Besides,in the later stage in launching,the pressure in low pressure chamber is increased by 14.3% and the missile overload coefficient is improved by 41.3%.Most of all,the launching speed of missiles is increased by 15.8% with the maximum overload and effective stroke kept constant.
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