NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES最新文献

{"title":"ROLES OF IONIC REACTIONSIN NANOSECOND DISCHARGE PLASMA-ASSISTED TEMPERATURE-DEPENDENT PYROLYSISAND OXIDATION OF METHANE FUEL","authors":"Qi Chen, Jintao Sun, Jianyu Liu, Baoming Zhao","doi":"10.30826/nepcap9b-02","DOIUrl":"https://doi.org/10.30826/nepcap9b-02","url":null,"abstract":"Kinetic roles of ionic reactions in nanosecond discharge (NSD) plasma-assisted temperature-dependent pyrolysis and oxidation of methane fuel were investigated by integrated studies of experimental measurements and mathematical simulation. A~detailed plasma chemistry mechanism governing the pyrolysis and oxidation processes in a He/CH4/O2 combustible mixture was proposed and studied by including a set of electron impact reactions, ionic reactions, dissociative recombination reactions, reactions involving excited species, and some important three-body recombination reactions. The calculation results of fractional power dissipated by electrons show that at the studied E/N of 78—281~Td, most of the nonequilibrium cold discharge power can be focused on the ion and radical production. The rate coefficients for CH4 and O2 ionization by electron impact increase with the increasing of E/N values, demonstrating that increasing the system temperature and, thus, the E/N values will have increasing kinetic effects on plasma-enhanced decomposition and oxidation. By modeling the reaction pathways of key ions, it is seen that O2+ presents the largest concentration in the discharge mixture, followed by CH4+, CH3+, and CH2+, which agrees well with the molecular beam mass spectrometric investigation. The calculation results further indicate that with the mixture temperature increasing, production of major ions including CH4+, CH3+, CH2, and O2+ play more and more important roles in CH4 pyrolysis and oxidation.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121691696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF ADDITIONAL AIR ON THE DETONATION VELOCITY IN HEPTANE/OXYGEN AND JET A-1 / OXYGEN MIXTURES IN A PULSING REACTIVE TYPE COMBUSTOR","authors":"M. Assad, O. Penyazkov, I. I. Chernuho, K. Alhussan","doi":"10.30826/nepcap9b-28","DOIUrl":"https://doi.org/10.30826/nepcap9b-28","url":null,"abstract":"В работе произведена оценка распространения волны горения в малогабаритной детонационной установке реактивного типа при сжигании смесей «гептан-воздух-кислород» и реактивного топлива «Jet A1-воздух-кислород» с учетом изменения концентраций компонентов и отношения кислорода к воздуху в смеси в диапазоне [02/воздух] < 1. Показано, что характер горения гептана и реактивного топлива Jet A1 в целом одинаков. Скорость волны относительно переменной f - коэффициента избытка горючего - описывается квадратичной функцией с экстремумом, соответствующим сжиганию смесей стехиометрического состава. С обогащением смеси топливом скорость волны замедляется почти на 50% в смеси «Jet A-1-воздух - кислород» и до 60% в смеси «гептан-воздух-кислород».","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130226394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"СКОРОСТЬ ГОРЕНИЯ ВЫСОКОЭНЕРЕЕТИЧЕСКИХ МАТЕРИАЛОВ, СОДЕРЖАЩИХ МЕТАЛЛИЧЕСКОЕ ГОРЮЧЕЕ НА ОСНОВЕ AL И B","authors":"Александр Геннадьевич Коротких, И. В. Сорокин, Е. А. Селихова, Владимир Афанасьевич Архипов","doi":"10.30826/nepcap9b-23","DOIUrl":"https://doi.org/10.30826/nepcap9b-23","url":null,"abstract":"An effective method of increasing the energy characteristics of high-energy materials (HEMs) is the use of boron and metal borides powders which have high values of specific energy released during oxidation and its combustion. This study investigates the powders of amorphous boron and aluminum borides which are used to the composition of solid propellant based on ammonium perchlorate, ammonium nitrate, and an active fuel-binder. Aluminum borides powders were obtained at RI AMM TSU (Tomsk) using the self-propagating high temperature synthesis (SHS) method. We carried out a~series of combustion measurements for the metallized HEM compositions in the range of nitrogen pressure of 0.5—7.0~MPa. The burning rate and power exponent were determined for the test HEM compositions in a constant pressure bomb. It was established that the complete replacement of pure aluminum by amorphous boron powder in HEM increases the burning rate of the HEM sample by 1.9—3.2 times depending on pressure. In this case, the exponent in the combustion law increases from~0.58 to~0.84. The burning rate of the HEM samples containing aluminum borides AlB2 and AlB12 increases by 1.2—1.6 times but the exponent remains constant.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"36 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113977005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE SOOT OPTICAL PROPERTIESIN PREMIXED ACETYLENE/AIR FLAME MEASURED BY LASER-INDUCED INCANDESCENCE","authors":"A. Drakon, A. V. 1EREMIN, E. V. 1GURENTSOV, E. Mikheyeva, R. Kolotushkin","doi":"10.30826/nepcap9b-07","DOIUrl":"https://doi.org/10.30826/nepcap9b-07","url":null,"abstract":"To understand the behavior of the optical properties of soot in the visible and near-infrared spectral range, it is crucial to determine the magnitude of their emission and absorption. Such information is necessary for a development of diagnostic methods for soot. We measured the absolute value of the refractive index functions of soot nanoparticles E(m,1064) at a wavelength of 1064~nm as well as the ratio of the refractive index functions at laser wavelengths of~532 and 1064~nm in a premixed acetylene/air flame (equivalence ratio~1.8) using laser-induced incandescence (LII). The results have shown that E(m,1064) increased with the flame height from~0.19 to~0.53. Depending on the height above the burner, the ratio of E(m,1064)/E(m,532) increased from~1.12 to~1.55. These changes in the optical properties are attributed to differences in the soot structure, such as the different distances between graphene planes inside soot crystallites, which decreased from~0.43 to~0.36~nm as the height above the burner (HAB) increased from~5 to~20~mm. The presented data provide comprehensive information about the optical properties of soot in a premixed acetylene/air flame depending on the HAB and make it possible to compare the measurements of the soot optical properties in various target flames.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125812817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ON THE POSSIBILITY OF THE POST-TRANSITION STATE CLASSICAL TRAJECTORY PREDICTIONS OF ENERGY DEPOSITION IN THE REACTION PRODUCTS£ DEGREESOF FREEDOM","authors":"Boris I. Loukhovitski","doi":"10.30826/nepcap9b-01","DOIUrl":"https://doi.org/10.30826/nepcap9b-01","url":null,"abstract":"The possibility of applying the method of post-transition state classical trajectory dynamic simulations to study the nascent energy distribution among the molecular degrees of freedom of the reaction products is considered on the example of a number of bimolecular reactions. The results obtained for the energy deposition in the vibrational degrees of freedom of the reaction products are compared both with the reliable experimental and theoretical data. We show that the methodology under consideration gives, in principle, adequate estimates of the energy released into vibrations; however, slight discrepancies are observed, the nature of which lies in the methodological grounds of this approach.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132548574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"УПРАВЛЕНИЕ С ПОМОЩВЮ ЖИДКОСТНОГО ЭЛЕКТРОКАПИЛЛЯРНОГО РЕЗОНАТОРА СОСТАВОМ РЕАГЕНТОВ ГАЗОФАЗНЫХ РЕАКЦИЙ","authors":"П. С. Кулешов","doi":"10.30826/nepcap9b-12","DOIUrl":"https://doi.org/10.30826/nepcap9b-12","url":null,"abstract":"Рассмотрены принципы бесконтактного управления составом газофазных реакций в ограниченном объеме вблизи или внутри электрокапиллярных жидкостных резонаторов. В качестве таких резонаторов могут служить выступы на жидкой пленке, жидкие капли или пузыри. Показана возможность управления с помощью электрического поля параметрами диспергации вещества резонатора из жидкой фазы в газовую: массовым расходом, электрическим током, распределением по размерам фрагментов дробления. Показана связь параметров диспергации с составом газофазных реагентов.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123128185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"СВЕРХКРИТИЧЕСКОЕ ИСТЕЧЕНИЕ КРИОГЕННОЙ СТРУИ АЗОТА","authors":"Никита Максимович Кузнецов, Сергей Николаевич Медведев, Сергей Михайлович Фролов, Ф. С. Фролов, Б. Басара, К. Пахлер","doi":"10.30826/nepcap9b-27","DOIUrl":"https://doi.org/10.30826/nepcap9b-27","url":null,"abstract":"Using the wide-range real-gas equation of state (EOS) of nitrogen, the gasdynamic calculations of the supercritical injection of a submerged turbulent jet of cryogenic nitrogen into a chamber filled with nitrogen at normal temperature are performed. The results of calculations are compared with available experimental data on nitrogen density variation in the jet. Satisfactory agreement of the results is obtained.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127560115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ВЛИЯНИЕ БОРА НА ХАРАКТЕРИСТИКИ ГОРЕНИЯ МЕТАЛЛИЗИРОВАННЫХ ВЫСОКОЭНЕРГЕТИЧЕСКИХ МАТЕРИАЛОВ","authors":"Александр Геннадьевич Коротких, И. В. Сорокин","doi":"10.30826/nepcap9b-22","DOIUrl":"https://doi.org/10.30826/nepcap9b-22","url":null,"abstract":"","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124495496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"СТОХАСТИЧЕСКАЯ МОЛЕКУЛЯРНАЯ ДИНАМИКА НАНОСТРУКТУР ПОРИСТОСТИ И КЛАСТЕРОВ КОНДЕНСАЦИИ","authors":"Г. И. Змиевская","doi":"10.30826/nepcap9b-11","DOIUrl":"https://doi.org/10.30826/nepcap9b-11","url":null,"abstract":"Формирование пористости материалов при имплантации высокоэнергетических ионов инертных газов в твердую поверхность, конденсация паров в плазме разряда с образованием наночастиц, образование доменов в ферроэлектриках, зарождение пульсаций турбулентности и другие процессы можно моделировать, формулируя кинетические уравнения в частных производных: Колмогорова–Феллера, Смолуховского или Фоккера–Планка. В работе рассматриваются процессы фазовых переходов на начальной стадии с помощью компьютерного моделирования. Кластеризация зародышей новой фазы и их броуновское движение анализируются методами стохастической молекулярной динамики на основе решения стохастических дифференциальных уравнений для траекторий случайных процессов, которыми описываются модели неравновесных стадий зародышеобразования, в результате получаем распределения плотностей вероятности или кинетических функций распределения, позволяющих рассмотреть механизмы возникновения неравновесных состояний начальной стадии фазового перехода 1-го или 2-го рода. Распределения кластеров (капель конденсации) по размерам отражают роль неустойчивостей фазового перехода, приводящих к формированию неравновесной бимодальной зависимости числа наночастиц от размера, для карбида кремния моделирование может быть учтено при получении как наноразмерных аморфных порошков, так и тонких покрытий. Образование пористости в кристаллической решетке при взаимодействии потока инертных газов и их имплантации в тонкие слои поверхности твердого образца приводит к образованию слоев аморфизации покрытия. Накопление деформаций в решетке за счет пористости зависит от энергии ионов и температуры с поверхности. Новым в характеристике процессов фазового перехода являются «структуры» самоорганизации, долгоживущие пространственно-временные образования в многомерных фазовых пространствах стохастических динамических переменных, таких как размеры частиц, скорости, координаты и др., связанные с моделями кластеризации (или нуклеацией). Алгоритмы численного метода устойчивы, метод стохастической молекулярной динамики для непрерывных траекторий дополнен статистическими алгоритмами потоков Пуассона для скачкообразных случайных процессов. Рассмотрены флуктуации заряда на зародышах капель в разряде и локальные напряжения, вызываемые пористостью в кристаллической решетке образца, а также уточнение коэффициента теплопроводности пористого карбида кремния для высоких температур.","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"27 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132610922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CONTROL OF WATER TRACES IN JET FUEL BY HEAT-PULSE TECHNIQUE","authors":"D. Volosnikov, I. I. Povolotskiy, A. A. Starostin, P. Skripov","doi":"10.30826/nepcap9b-26","DOIUrl":"https://doi.org/10.30826/nepcap9b-26","url":null,"abstract":"","PeriodicalId":384046,"journal":{"name":"NONEQUILIBRIUM NATURAL AND TECHNOLOGICAL PROCESSES","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}