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The peculiarities of applying CAD/CAE systems for the primary combustion chamber flame tube cycle life prolongation of the tactical military aircraft afterburning turbofan jet engine

Pashchenko Serhii, Kharchenko Oleksandr, Shulhin Artem, Chemerys Yevheniy

Journal of KONBiN

2022

Vol. 52, iss. 4

167--176

In this article, the computational simulation of the workflow in the primary combustion chamber flame tube of the afterburning turbofan jet engine (ATJE) on the tactical military aircraft was carried out. The geometric model of a flame tube was created and adapted to perform the interrelated calculation of the thermal and stress-strain behaviour of the walls of the flame tube influenced by the operational loads during the computational simulation of the workflow. Quantitative and qualitative analysis of the simulation results was conducted, and the connection between the peculiarities of the workflow and the characteristic damage of the flame tubes, detected during the operation, was established. The possibility of using modern CAD/CAE systems to solve the scientific tasks towards maximizing the cycle life potential of the main and primarily important components of the ATJE on the assessment basis of their damage exhaustion degree was determined.

Cycling behaviour of barium doped LiMn2O4 cathode materials for Li ion secondary batteries

Sahan H., Göktepe H., Patat S.

Materials Science Poland

2010

Vol. 28, No. 4

773--780

In order to improve the cycling performance of LiMn2O4, the spinel phase LiMn2-xBaxO4 (x = 0.01, 0.02 and 0.05) compounds were fabricated by the glycine-nitrate method. The structures of the products were investigated by X-ray diffraction. Electrochemical studies were carried out using the Li|LiMn2O4 and Li|LiMn2-xBaxO4 cells. The capacity loss of Li|LiMn2O4 cell is about 15% after 30 cycles, whereas that for Ba doped spinel materials (x = 0.01, 0.02 and 0.05) are 7.5%, 3.5% and 1.8% respectively. The good capacity retention of LiMn2-xBaxO4 electrodes is attributed to stabilization of the spinel structure by Ba doping of Mn sites. Ba substituted spinals display better cycle performance in terms of cycle life compared with LiMn2O4.