Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants

Gardiner, P A; Egawa, Yuya; Watanabe, Keiko

doi:10.1299/mej.16-00273

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…3. The maximum projectile speed was approximately 500 m/s (Gardiner et al, 2016). The projectile consisted of a brass impactor and polyethylene sabot as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Measurement of plasma for elucidation of crater formation mechanism on aluminum foam under high speed impact

Sakai

Umeda

Watanabe

2016

Mechanical Engineering Journal

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“…3. The maximum projectile speed was approximately 500 m/s (Gardiner et al, 2016). The projectile consisted of a brass impactor and polyethylene sabot as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Measurement of plasma for elucidation of crater formation mechanism on aluminum foam under high speed impact

Sakai

Umeda

Watanabe

2016

Mechanical Engineering Journal

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“…2. The projectile sabot diameters ranged from 14.96 to 14.98 mm, as determined from a previous study [4]. A neodymium magnet was placed inside the projectile to measure the projectile velocity using the magnet-coil method, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…At the Impact Engineering Laboratory in Ritsumeikan University, a diaphragmless vertical gas gun was designed. The performance of this gun has previously been evaluated for pressure ranges of 1 MPa and higher in a high-pressure vessel [4]. The maximum velocity, optimal projectile sabot diameters, and theoretical formula to accurately predict the projectile velocity were investigated.…”

Section: Introductionmentioning

confidence: 99%

Velocity Control of Diaphragmless Vertical Gas Gun for Low Pressure Ranges

Yano

Gardiner

Egawa

et al. 2016

KEM

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In the field of impact engineering, high-speed impact phenomena are simulated using a projectile accelerator. At the Impact Engineering Laboratory in Ritsumeikan University, a single-stage gas gun was designed to investigate the high-speed penetration phenomena of impacts in sand, which is known to show fluid-like behavior. The gas gun consists of a 2 m launch tube that can achieve projectile muzzle velocities of up to around 500 m/s. The theoretical muzzle velocity of the projectile can be calculated by considering the speed of sound and the specific heat ratio of propellant gases. A performance evaluation for high-pressure ranges of 1 MPa and higher in a high-pressure vessel has been conducted. When fitting parameters are introduced to the theoretical formula, good agreement is obtained with the experimental results. In this study, experiments for low pressure ranges were conducted to predict the projectile velocity and to investigate the minimum velocity limit of the projectile. By introducing fitting parameters to the theoretical formula, the projectile velocity could be predicted accurately for pressure ranges less than 1 MPa. Furthermore, the minimum velocity limit of this equipment was found to be around 30 m/s.

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“…На рис. 1 показана зависимость максимально достижимых скоростей в известных экспериментах на одноступенчатых газовых пушках по результатам анализа источников [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] от отношения давления в камере p 0 к коэффициенту массы снаряда c q = m/d 3 , традиционно измеряемому в g/cm 3 . С точки зрения расчета режимов, а также конструирования газовых лабораторных установок, важнейшим вопросом является адекватное моделирование физических процессов, позволяющее предсказывать результаты эксперимента с высокой степенью точности.…”

Section: Introductionunclassified

Влияние Уширения Газового Ресивера На Баллистические Характеристики Одноступенчатых Установок На Сжатом Газе

Быков¹,

Шестаков²

2020

Журнал Технической Физики

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The effect of the broadening of the gas reservoir on the exit velocity of the projectile during acceleration in the barrel by compressed gas is investigated. The simulation was carried out in the framework of quasi-one-dimensional and two-dimensional axisymmetric gas-dynamic models. Models are validated on experimental results. It is shown that the use of a wider reservoir with the same volume and initial pressure can increase efficiency by 25%. The significant effect of air compression in front of a light projectile under supersonic conditions on its speed is demonstrated. Accounting for air compression in front of the projectile was carried out using an approximate formula, which showed good results compared to the two-dimensional model. The effect of accelerating a light projectile due to the expulsion of an air column through the muzzle has been revealed.

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Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants

Cited by 7 publications

References 3 publications

Measurement of plasma for elucidation of crater formation mechanism on aluminum foam under high speed impact

Measurement of plasma for elucidation of crater formation mechanism on aluminum foam under high speed impact

Velocity Control of Diaphragmless Vertical Gas Gun for Low Pressure Ranges

Влияние Уширения Газового Ресивера На Баллистические Характеристики Одноступенчатых Установок На Сжатом Газе

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