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

The main difficulty in conducting a high velocity experiment with a projectile accelerator is predicting the projectile velocity with great accuracy. This is of crucial importance in order to keep experimental conditions constant. During the design process of the single stage diaphragmless vertical...

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Autores principales:	Peter A. GARDINER, Yuya EGAWA, Keiko WATANABE
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	gas gun performance evaluation projectile velocity theoretical prediction equation of motion Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/b71ada08b0cb49b68a77fba3cd9b3432
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spelling	oai:doaj.org-article:b71ada08b0cb49b68a77fba3cd9b34322021-11-26T06:58:32ZPerformance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants2187-974510.1299/mej.16-00273https://doaj.org/article/b71ada08b0cb49b68a77fba3cd9b34322016-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/6/3_16-00273/_pdf/-char/enhttps://doaj.org/toc/2187-9745The main difficulty in conducting a high velocity experiment with a projectile accelerator is predicting the projectile velocity with great accuracy. This is of crucial importance in order to keep experimental conditions constant. During the design process of the single stage diaphragmless vertical gas gun installed at the Impact Engineering Laboratory in Ritsumeikan University, a theoretical formula proposed by Seigel was used to predict the projectile velocity for various ranges of gas pressure. However, the complexity of projectile dynamics such as frictional effects between the projectile and the launch tube, the aerodynamics of the projectile, temperature effects and pressure disturbances occurring during projectile acceleration are factors excluded from the theoretical formula, making it challenging to predict the actual velocity of the projectile. Hence, it was necessary to conduct a performance evaluation of single stage diaphragmless vertical gas gun. For the experiment, flat projectiles were used consisting of a brass impactor and a high-density polyethylene sabot. A neodymium magnet was placed inside the sabot for velocity measurement using Magnet-Coil method, and nitrogen and helium were selected as gas propellants. The experimental results were carefully analyzed, and found to show a similar trend with the theoretical solution. Fitting parameters were then introduced to make the final adjustment to the theoretical formula, showing good agreement with the experimental results.Peter A. GARDINERYuya EGAWAKeiko WATANABEThe Japan Society of Mechanical Engineersarticlegas gunperformance evaluationprojectile velocitytheoretical predictionequation of motionMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 6, Pp 16-00273-16-00273 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	gas gun performance evaluation projectile velocity theoretical prediction equation of motion Mechanical engineering and machinery TJ1-1570
spellingShingle	gas gun performance evaluation projectile velocity theoretical prediction equation of motion Mechanical engineering and machinery TJ1-1570 Peter A. GARDINER Yuya EGAWA Keiko WATANABE Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
description	The main difficulty in conducting a high velocity experiment with a projectile accelerator is predicting the projectile velocity with great accuracy. This is of crucial importance in order to keep experimental conditions constant. During the design process of the single stage diaphragmless vertical gas gun installed at the Impact Engineering Laboratory in Ritsumeikan University, a theoretical formula proposed by Seigel was used to predict the projectile velocity for various ranges of gas pressure. However, the complexity of projectile dynamics such as frictional effects between the projectile and the launch tube, the aerodynamics of the projectile, temperature effects and pressure disturbances occurring during projectile acceleration are factors excluded from the theoretical formula, making it challenging to predict the actual velocity of the projectile. Hence, it was necessary to conduct a performance evaluation of single stage diaphragmless vertical gas gun. For the experiment, flat projectiles were used consisting of a brass impactor and a high-density polyethylene sabot. A neodymium magnet was placed inside the sabot for velocity measurement using Magnet-Coil method, and nitrogen and helium were selected as gas propellants. The experimental results were carefully analyzed, and found to show a similar trend with the theoretical solution. Fitting parameters were then introduced to make the final adjustment to the theoretical formula, showing good agreement with the experimental results.
format	article
author	Peter A. GARDINER Yuya EGAWA Keiko WATANABE
author_facet	Peter A. GARDINER Yuya EGAWA Keiko WATANABE
author_sort	Peter A. GARDINER
title	Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
title_short	Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
title_full	Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
title_fullStr	Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
title_full_unstemmed	Performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
title_sort	performance evaluation of single stage diaphragmless vertical gas gun for nitrogen and helium gas propellants
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/b71ada08b0cb49b68a77fba3cd9b3432
work_keys_str_mv	AT peteragardiner performanceevaluationofsinglestagediaphragmlessverticalgasgunfornitrogenandheliumgaspropellants AT yuyaegawa performanceevaluationofsinglestagediaphragmlessverticalgasgunfornitrogenandheliumgaspropellants AT keikowatanabe performanceevaluationofsinglestagediaphragmlessverticalgasgunfornitrogenandheliumgaspropellants
_version_	1718409740869959680

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

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