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Research Papers

Determination of Pressure Profile During Closed-Vessel Test Through Computational Fluid Dynamics Simulation

[+] Author and Article Information
Ahmed Bougamra

School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001, China
e-mail: ahmed.bougamra@yahoo.fr

Huilin Lu

School of Energy Science and Engineering, Harbin Institute of Technology,
92 West Dazhi Street,
Nan Gang District,
Harbin 150001,China
e-mail: huilin@hit.edu.cn

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 29, 2014; final manuscript received October 21, 2015; published online November 24, 2015. Assoc. Editor: Mehmet Arik.

J. Thermal Sci. Eng. Appl 8(2), 021005 (Nov 24, 2015) (6 pages) Paper No: TSEA-14-1116; doi: 10.1115/1.4031930 History: Received April 29, 2014; Revised October 21, 2015

Two-phase flow modeling of solid propellants has great potential for simulating and predicting the ballistic parameters in closed-vessel tests as well as in guns. This paper presents a numerical model describing the combustion of a solid propellant in a closed chamber and takes into account what happens in such two-phase, unsteady, reactive-flow systems. The governing equations were derived in the form of coupled, nonlinear axisymmetric partial differential equations. The governing equations with customized parameters were implemented into ansys fluent 14.5. The presented solutions predict the pressure profile inside the closed chamber. The results show that the present code adequately predicts the pressure–time history. The numerical results are in agreement with the experiment. Some discussions are given regarding the effect of the grain shape and the sensitivity of these predictions to the initial pressure of the solid propellant bed. The study demonstrated the capability of using the present model implemented into Fluent, to simulate the combustion of solid propellants in a closed vessel and, eventually, the interior ballistic process in guns.

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References

Figures

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Fig. 1

Example of a closed-vessel test result, in which the ignition time (ting) is indicated [14]

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Fig. 2

An example of pressure–time data curve: (a) unmodified pressure–time data curve and (b) modified pressure–time data curve [9]

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Fig. 3

Experimental closed-vessel schematic [15]

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Fig. 4

Average pressure–time history of the closed vessel, for mp = 20.5 g and p0 = 101,325 Pa

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Fig. 5

Average pressure–time history of the closed vessel, for mp = 20.5 g

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Fig. 6

Over 10–80% maximum average pressure–time history of the closed vessel, for mp = 20.5 g

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Fig. 7

Average pressure–time history of the closed vessel, for mp = 12.8 g

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Fig. 8

Average pressure–time history of the closed vessel, for mp = 20.5 g

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Fig. 9

Relationships (a) between Z and Σ and (b) between Δu and Z

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