Preliminary Study of Two-Stage Light Gas GunUsing Reactive Gas as Driving Energy
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摘要: 二级轻气炮是一种常见的超高速发射装置，其发射速度的调节范围大，弹速重复性好，对场地条件的要求不高，在高压物理、空间碎片防护、材料力学性能及动态响应研究等方面有广泛的应用。但是传统的轻气炮采用火药作为驱动能源，存在火药分子质量大、声速低、产物有毒、运输和存储受限等缺点。为此，设计并发展了用气体反应释能代替火药作为驱动能源的反应气体驱动二级轻气炮技术，实测发射弹速达到5.6 km/s。该技术是一种廉价、无需火工品、环境友好型气炮驱动技术。Abstract: The two-stage light gas gun is a conventional device for accelerating a projectile commonly chosen for research owing to its wide range of launching velocities, good repeatability and flexible work environment, and is widely used in studies of high pressure physics, space debris protection, and mechanical properties and dynamic responses of materials.However, as the traditional light gas gun uses explosive as the energy source, it suffers from the disadvantages of comparatively heavy molecular weight and low sound velocity, poisonous products, requirement of special conditions for transportation and storage.In this work we developed a novel two-stage light gas gun, whose driving energy is supplied by the gaseous chemical reaction, and whose highest velocity in projectile-launching reaches 5.6 km/s.This novel technology is inexpensive, free from use of explosive and environment-friendly.
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Key words:
- hypervelocity launching /
- gas reaction /
- two-stage light gas gun /
- high pressure physics
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图 1 不同推进剂下弹底与反应室的压强比(pb/pchamber)与弹丸速度(up)的关系曲线
Figure 1. Curves of ratio of projectile base pressure tochamber pressure (pb/pchamber) vs.projectilevelocity (up) with different propellants
图 2 反应气体驱动二级轻气炮结构示意图
Figure 2. Structural diagram of two-stage light gas gun using reactive gas as driving energy
图 5 实验后活塞、大膜片和小膜片的实物图
Figure 5. Photographs of actual pistons, big films and small films after experiments
表 1 反应气体驱动20/57 mm二级轻气炮实验数据
Table 1. Experimental data of 20/57 mm two-stage light gas gun using reactive gas as driving energy
No. dlaunch/(mm) dpump/(mm) E/(MJ) mnitrocotton*/(g) Cu flyer dimension/(mm×mm) mp/(g) up/(km/s) 1 20 57 2.59 612 Ø18×1.5 9.47 4.52 2 20 57 2.59 612 Ø18×1.5 9.21 4.70 3 20 57 3.52 831 Ø18×1.0 8.06 5.64 
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