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该文从分析影响超高速火炮初速的理想工质入手，根据国外超高速发射技术的最新实验研究成果，介绍一种吸收电热化学炮、轻气炮优点的新型火炮装置———电热化学轻气炮。由于该炮在电热化学炮的基础上加入轻质气体这一理想工质，因而能大大改善弹丸后部的压力分布，提高火炮弹丸的初速。该文以内弹道学原理为理论基础，介绍了这种新型火炮装置的工作原理，并建立了其内弹道物理数学模型，为这种超高速射弹装置的设计和实际应用提供了理论依据。
According to the latest experimental research results of ultra-high-speed launch technology in foreign countries, this paper introduces a new type of artillery device that absorbs the advantages of electro-chemical chemical light gun and light gas gun --- electrothermal chemical light gas gun. As the gun in the electro-chemical gun based on the addition of light gas, the ideal working fluid, which can greatly improve the projectile rear pressure distribution, improve the velocity of artillery projectile. Based on the theory of internal ballistics, this paper introduces the working principle of this new type of artillery device, and establishes the mathematical model of its internal ballistic physics to provide a theoretical basis for the design and practical application of this ultra-high speed projectile device.