Performance analysis and enhancement of the ballistic range

Rajesh, G.; Kim, Heuy Dong; Setoguchi, Toshiaki; Raghunathan, Srinivasan

doi:10.1243/09544100jaero229

Cited by 10 publications

(10 citation statements)

References 16 publications

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“…Rajesh et al [18][19][20] studied analytically the effects of important parameters such as pump tube pressure, piston mass, type of light gas, and the diameters of pump and launch tubes on the performance of two stages gas gun. They used the fifth order Rung-Kutta method to solve the resultant equations ignoring the effect of viscosity and heat transfer.…”

Section: Rajesh Theorymentioning

confidence: 99%

“…They examined the effect of various gas parameters such as piston and projectile mass on the projectile speed. Rajesh et al [19] also investigated the effect of adding a pump tube in between the pump tube and launch tube and its influence on the efficiency of the gun. Rajesh et al [20] investigated the fluid dynamic features of the compression process in the pump tube of a ballistic range and to assess how it affects the performance of the ballistic range.…”

Section: Introductionmentioning

confidence: 99%

“…The features of the gas gun in studied by numerical simulations using the Autodyn commercial software. The features are also investigated using the theory of Rajesh [18][19][20]. The effect of parameters such as the chamber and pump tubes pressures and piston mass on performance of the gun is evaluated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Majzoobi

Rahmati

Kashfi

2019

IJE

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Two stages gas guns are used for various purposes, particularly for mechanical characterization of materials at high rate of deformations. The performance of a two stages gas gun is studied in this work using the theory of the two-stage gas gun proposed by Rajesh, numerical simulation using combined Eulerian/ Lagrangian elements in Autodyna commercial code and experiment using a two stage gas gun developed by the authors of this study. Equations governing the motion of the piston and projectile are solved using Runge-Kutta method. The effects of parameters such as chamber pressure, pump tube pressure and piston mass on the performance of gun are explored. The results of numerical simulation and analytical methods are validated by experiment. Finally, a comparison between the analytical, numerical and experimental results shows that the theory proposed by Rajesh, yields reasonable predictions for the two stage gas gun performance in the first place, and Autodyn software, using combined Eulerian/ Lagrangian elements, gives accurate estimations for gas gun parameters, in the second place. A 3-D working diagram is provided for prediction of projectile velocity for any state of pump and chamber pressures which are the most important variables for a gas gun with a fixed geometry.

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Section: Rajesh Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Majzoobi

Rahmati

Kashfi

2019

IJE

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“…[1][2][3][4][5] Most of the previous studies focused on understanding the complex running cycle and optimizing the operational parameters to improve the performance. [6][7][8] However, only little work has been devoted to improve the conditions for launching fragile models. The study by Young and Rushing 9 reduced the maximum acceleration loads of model by changing the configuration of gun, and achieved soft launch capabilities for fragile models.…”

Section: Introductionmentioning

confidence: 99%

The effect of waves rupture diaphragm on acceleration loads of projectile

Shi-chang

Huang

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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The acceleration loads of projectile during launch process of two-stage light gas gun were studied by the developed computational fluid dynamics program. With the usage of LS-DYNA software, the diaphragm rupture pressure was calculated by finite element method. The influence of different waves rupture diaphragm on the maximum acceleration loads of projectile was analyzed, keeping the configurations of gun unchanged. It is found that the maximum acceleration loads can be reduced and the muzzle velocity objective can be achieved by choosing the ruptured wave appropriately and optimizing other operational parameters. Soft launch capability is provided for launching complex lifting configuration models up to hypervelocity.

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“…In addition to such base pressure problems, suddenly expanded flow fields find application in combustion chambers, propulsion system, parallel diffusers, heat exchangers, ballistic ranges [1], thrust augmentation systems for cruise missiles [2], ejectors when operated without the secondary flow [3], etc. In all these engineering applications, the ability to predict the behaviour of the wallbounded supersonic flow has become increasingly important.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effects of base size on supersonic flow through a sudden duct enlargement

Lijo

Kim

Setoguchi

2011

Proceedings of the Institution of Mechanical Engineers, Part G:

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An abrupt increase in duct cross-section is often found in pressure-reducing devices, valves of internal-combustion engines, flow control devices in pipe systems of power plants, launch tubes of the ballistic ranges, thrust augmentation systems for cruise missiles, zero secondary flow ejectors, etc. The objective of this study is to revisit the classical base flow fields in a wall-bounded supersonic flow past a sudden expansion, to study and exploit their dependence on the size of the enlarged part -termed as the base size. Two-dimensional numerical simulations are performed for a nozzle flow, which is suddenly expanded in a larger rectangular channel. Five different turbulence models have been utilized in this study. Flow determination near the base is influenced by the proper selection of the turbulence model. The numerical solutions are compared with available experimental data and good agreement is achieved with renormalization group k-" turbulence model. This investigation is concerned with the determination of the base size, for which the jet characteristics and the base pressure become independent of the size of the enlarged part. For a given duct, base pressure tends to a minimum for a particular pressure ratio. In this study, the authors have been able to link the jet characteristics to the base size by both analytical and numerical methods. This has led to the conclusion that for a constant driving pressure, the base pressure asymptotically decreases when the base size is increased up to a critical value, and it becomes independent of the base size thereafter. It is believed that the results of this study can provide a better understanding of the wall-bounded supersonic flow past a sudden expansion. The relevance of the present observations in some of the engineering applications is also discussed.

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Performance analysis and enhancement of the ballistic range

Cited by 10 publications

References 16 publications

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

The effect of waves rupture diaphragm on acceleration loads of projectile

Numerical investigation of the effects of base size on supersonic flow through a sudden duct enlargement

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