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Список видань за алфавітом назв: Авторський покажчик Покажчик назв публікацій  |
Пошуковий запит: (<.>A=Chernai A$<.>) | |||
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Загальна кількість знайдених документів : 7 Представлено документи з 1 до 7 |
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| 1. | 
Chernai A. V. The kinetics of the methane acidification by the oxygen and its role in the blast air wave formation in mine workings [Електронний ресурс] / A. V. Chernai, M. M. Nalysko, H. S. Derevianko // Науковий вісник Національного гірничого університету. - 2016. - № 1. - С. 63-69. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2016_1_12 Purpose. The numerical calculation of the gas explosion parameters subject to the kinetics of the methane oxidation by oxygen in mine atmosphere, carryin out the model testing accounts of the methane-air mixtures explosion. Methodology. The mathematical modeling of the gas-dynamic and physicochemical processes of the gas explosion. The numerical experiment of the methane ignition process, deflagration and detonation combustion, formation and propagation the explosive airwaves. Findings. The choice of the chemical kinetics model of methane combustion mechanism in open reactor has been substantiated. The nonstationary processes of the methane-air environment explosion, formation and spreading of the explosion wave in mine workings has been modeled. The numerical experiment results have been analyzed. Originality. The new approach in realization of the pattern of gas dynamic process numerical account - methane explosion - has been developed, in which the kinetics of methane oxidation chemical reaction and dynamics of explosion energy transmission by explosion wave and gas environment streams have been combined. Practical value. The results of the numerical account scheme modification are applied during the technical solutions substantiation regarding the explosion security of mine workings emergency areas. | ||
| 2. |
Chernai A. V. Mathematical simulation of gas mixture forsed ignition for the calculation of the damaging factors of emergency explosion [Електронний ресурс] / A. V. Chernai, M. M. Nalysko // Науковий вісник Національного гірничого університету. - 2016. - № 5. - С. 106-114. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2016_5_18 Purpose. Selection and substantiation of the method of calculating the parameters of the ignition of gas mixtures with a heated body, the calculation of parameters and the evaluation of the reliability of performance of the established criteria for the initiation of the gas explosion. Methodology. Mathematical simulation, numerical experiment, analysis and synthesis of the results. Findings. The task of unsteady-state conduction problem of finding the temperature distribution in the thermal layer, near a source of ignition of air-gas mixture was set. Boundary conditions for a spherical source of ignition were defined. To solve the problem it was proposed to use the method of integral heat balance in which the thermal conductivity equation is replaced by the integral heat balance. Solutions of this equation are sought in the form of a polynomial of the second degree, i.e., the desired temperature profile in the thermal layer is represented as a quadratic parabola. As a result, an equation of the parabola as a dependence of temperature on the coordinates, time, heat capacity and heat generation from the ignition source is obtained. This solution allowed determining the effect of thermal oxidation of methane and, on that basis showing the convergence of the numerical method with the results of the analytical solution. Originality. On the basis of the theory of thermal ignition and quasi-static approach, an analytical solution of the problem is found by methods of the integral balance, non-stationary temperature distribution in the thermal layer near a source of ignition of air-gas mixture. The thermal effect of oxidation of methane near a source of ignition is defined and the convergence of the numerical method of calculation of parameters of shock airwaves with the results of the analytical solution in terms of performance of the ignition criterion is shown. Practical value. The resulting solution makes it possible to analyze the accuracy of the computing process methods of numerical simulation of gasdynamic parameters of shock waves in the air of the initiation of combustion and explosion of gas-air mixtures. The analysis of the accuracy of the computational process allows the use of numerical methods in practical calculations of finding a safe distance from the centers of the explosion in the liquidation or predicting the consequences of accidents. | ||
| 3. | 
Aulin V. Features of electrochemical-mechanical running-in of chrome-plated piston rings to the cast-iron surface of the cylinder liner under different friction modes [Електронний ресурс] / V. Aulin, T. Zamota, A. Hrynkiv, S. Lysenko, M. Chernovol, A. Chernai // Problems of tribology. - 2019. - Vol. 24, no. 3. - С. 85-91. - Режим доступу: http://nbuv.gov.ua/UJRN/Ptl_2019_24_3_13 | ||
| 4. |
Aulin V. Regularities of dynamics of change in tribotechnical characteristics of coatings formed by tribotechnologies of restoration [Електронний ресурс] / V. Aulin, S. Lysenko, A. Hrynkiv, D. Velykodnyi, A. Chernai, A. Lukashuk // Problems of tribology. - 2019. - no. 1. - С. 73-80. - Режим доступу: http://nbuv.gov.ua/UJRN/Ptl_2019_91_1_13 | ||
| 5. |
Aulin V. Wear resistance increase of samples tribomating "Steel 45-cast iron SCH20" with geo modifier KGMF-1 [Електронний ресурс] / V. Aulin, S. Lysenko, A. Hrynkiv, A. Chernai, I. Zhylova, A. Lukashuk // Problems of tribology. - 2019. - no. 2. - С. 55-60. - Режим доступу: http://nbuv.gov.ua/UJRN/Ptl_2019_92_2_10 | ||
| 6. |
Aulin V. V. Creation of theoretical bases of tribotechnologies of running-in and restoration as means of effective increase of operational wear resistance of motor transport and mobile agricultural machinery [Електронний ресурс] / V. V. Aulin, S. V. Lysenko, A. V. Hrinkiv, V. V. Slon, A. E. Chernai // Problems of tribology. - 2021. - Vol. 26, no. 1. - С. 51-58. - Режим доступу: http://nbuv.gov.ua/UJRN/Ptl_2021_26_1_9 | ||
| 7. |
Aulin V. V. New approach to elucidating the physical nature of the processes that occur in the friction zone of mates of machine parts [Електронний ресурс] / V. V. Aulin, S. V. Lysenko, A. V. Hrinkiv, A. E. Chernai, I. V. Zhylova // Problems of tribology. - 2020. - Vol. 25, no. 4. - С. 13-19. - Режим доступу: http://nbuv.gov.ua/UJRN/Ptl_2020_25_4_4 | ||
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