Volume 20, Issue 1 (January 2020)
Modares Mechanical Engineering 2020, 20(1): 193-202 |
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Zhaleh D, Ommi F, Saboohi Z. Numerical Investigation of Pore-Structure in Design of Catalytic Beds for Mono-Propellant Thrusters. Modares Mechanical Engineering 2020; 20 (1) :193-202
URL: http://mme.modares.ac.ir/article-15-27494-en.html
URL: http://mme.modares.ac.ir/article-15-27494-en.html
1- Aerospace Department, Mechanical Engineering Faculty, Tarbiat Modares University, Tehran, Iran
2- Aerospace Department, Mechanical Engineering Faculty, Tarbiat Modares University, Tehran, Iran , fommi@modares.ac.ir
3- Aerospace Research Institute, Ministry of Science, Research, and Technology, Tehran, Iran
2- Aerospace Department, Mechanical Engineering Faculty, Tarbiat Modares University, Tehran, Iran , fommi@modares.ac.ir
3- Aerospace Research Institute, Ministry of Science, Research, and Technology, Tehran, Iran
Abstract: (2751 Views)
The idea of designing new geometries for catalytic bed in the decomposition chamber of monopropellant thrusters is introduced with numerical simulations of pore-scale turbulent flows. The LES numerical technique is used for simulation of turbulent structures in the flow-field. The efficiency and reliability of the results obtained from numerical simulation have been determined by solving a benchmark problem of turbulent flow over the pack of cubes. The results show very good agreement with the experimental data, indicating the accuracy of the used model and numerical solution process. The characteristics of turbulent flow over two different geometries have been investigated using the numerical method. The results have been analyzed to evaluate the effectiveness of geometrical changes on the parameters associated with the catalytic reaction. All simulations have been conducted for cold flow, and the exact effects of the geometrical design of porous bed on reactive flow have not been quantified. The eddy dissipation and length scales of turbulence have been considered as the main parameters, because of their effect on rates of turbulent mixing and rate of reaction. The difference between the turbulent dissipation and length scales in the investigated flows in two different geometries indicates the effectiveness of the geometrical changes of the porous bed on the flow characteristics. Coherent structures are seen in the new geometry and the wall shear stress is reduced significantly, which increases the life of the catalytic coating.
Article Type: Original Research |
Subject:
Experimental Fluid Mechanics
Received: 2018/11/24 | Accepted: 2019/05/4 | Published: 2020/01/20
Received: 2018/11/24 | Accepted: 2019/05/4 | Published: 2020/01/20
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