firesmiПожаровзрывобезопасность/Fire and Explosion SafetyPozharovzryvobezopasnost/Fire and Explosion Safety0869-74932587-6201ФГБОУ ВО «Национальный исследовательский Московский государственный строительный университет»10.18322/pvb.2018.27.7-8.24-31firesmi-664Research ArticleПРОЦЕССЫ ГОРЕНИЯ, ДЕТОНАЦИИ И ВЗРЫВАCOMBUSTION, DETONATION AND EXPLOSION PROCESSESВлияние неоднородного распределения температур по высоте помещения на высоту плоскости равных давлений при пожареInfluence of heterogeneous temperature distribution along the premise height on the height of a plane of equal pressures during fireПузачС. В.PuzachS. V.

Доктор технических наук, профессор, заслуженный деятель науки РФ, начальник кафедры инженерной теплофизики и гидравлики.

129366, Москва, ул. Бориса Галушкина, 4

Doctor of Technical Sciences, Professor, Honoured Scientist of the Russian Federation, Head of Thermal Physics and Hydraulic Department.

Borisa Galushkina St., 4, Moscow, 129366

puzachsv@mail.ruСитниковИ. В.SitnikovI. V.

Старший преподаватель кафедры техносферной и пожарной безопасности.

394006, Воронеж, Московский просп., 14

Senior Lecturer of Technospheric and Fire Safety Department.

Voronezh, 394006, Moscow Avenue, 14

igorsitnikov.vrn@gmail.comЛебедченкоО. С.LebedchenkoO. S.

Кандидат юридических наук, доцент, доцент кафедры инженерной теплофизики и гидравлики.

129366, Москва, ул. Бориса Галушкина, 4

Candidate of Legal Sciences, Assistant Professor, Assistant Professor of Thermal Physics and Hydraulic Department.

Borisa Galushkina St., 4, Moscow, 129366

ol-26@mail.ruКомраковП. В.KomrakovP. V.

Кандидат технических наук, доцент, начальник кафедры процессов горения.

129366, Москва, ул. Бориса Галушкина, 4

Candidate of Technical Sciences, Assistant Professor, Head of Combustion Processes Department.

Borisa Galushkina St., 4, Moscow, 129366

ТунгДо ТханьTungDo Thanh

Кандидат технических наук, научный сотрудник.

100000, Ханой, ул. Динх Ле, 2А

Candidate of Technical Sciences, Researcher.

Dinh St., 2A, Hanoi, 100000, Vietnam

dotung1288@gmail.comАкадемия ГПС МЧС РоссииРоссияState Fire Academy of Emercom of RussiaRussian FederationВоронежский государственный технический университетРоссияVoronezh State Technical UniversityRussian FederationГлавное управление пожарной безопасности и спасения Министерства общественной безопасности ВьетнамаВьетнамVietnam Fire and Rescue Police Department, Ministry of Public SecurityViet Nam201802102018277-82431Copyright © Пузач С.В., Ситников И.В., Лебедченко О.С., Комраков П.В., Тунг Д.Т., 20182018Пузач С.В., Ситников И.В., Лебедченко О.С., Комраков П.В., Тунг Д.Т.Puzach S.V., Sitnikov I.V., Lebedchenko O.S., Komrakov P.V., Tung D.T.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.fire-smi.ru/jour/article/view/664

Выполнена теоретическая оценка влияния неоднородного распределения температур по высоте помещения на высоту плоскости равных давлений при пожаре. Показано, что в открытом проеме могут существовать две нейтральные плоскости. Получены экспериментальные зависимости распределения температур по высоте и высоты плоскости равных давлений от времени. Проведено сравнение теоретических распределений температур по высоте экспериментального объема, полученных с учетом и без учета неоднородного распределения температур, с экспериментальными данными. Экспериментально подтверждено существование двух плоскостей равных давлений на начальной стадии развития пожара. Показано, что для достоверного обоснования времени срабатывания пожарных температурных извещателей необходимо учитывать неоднородность температурного поля по высоте помещения.

Introduction

Introduction. Heat and mass transfer through open holes is influenced significantly by the temperature distribution over the height of the premise. In the first approximation in the integral model of calculating the dynamics of dangerous fire factors, the temperature along the height of the premise is assumed to be constant and equal to its average volume value. However, the temperature varies significantly along height, and the distribution of pressures along the height inside the premise is not linear. Therefore, it is necessary to conduct further experimental and theoretical studies of the influence of the inhomogeneity of the temperature field inside the premise on the parameters of heat and mass transfer through the openings.

Goals and objectives

Goals and objectives. The purpose of the paper is to evaluate experimentally and theoretically the influence of the inhomogeneity of the temperature distribution along the height of the premise upon the height of the neutral plane. To achieve this, we used the formula for the temperature distribution along the altitude, which includes the empirical coefficient of the inhomogeneity of the tempera ture field. Experimental studies were carried out that made it possible to refine the above-mentioned coefficient and determine the position of the plane of equal pressures at the initial stage of the fire.

Methods

Methods. A theoretical method for calculating the temperature distribution over the height of the premise and the height of the neutral plane is used, as well as an experimental method for studying heat and mass transfer in a small experimental installation.

Results

Results. Experimental dependences of the temperature distribution along the height of the experi Mental volume at different times and the height of the plane of equal pressures on time are obtained. A comparison is made between experimental data and the theoretical temperature distributions along the height obtained with and without allowance for temperature inhomogeneity. The existence of two planes of equal pressures at the initial stage of the fire is experimentally confirmed. It is shown that for a reliable justification of the response time of fire temperature detectors it is necessary to take into account the inhomogeneity of temperature along the height of the premise.

Conclusion

Conclusion. The temperature distribution along the height of the premise, taking into account the inhomogeneity of the temperature field, is in satisfactory agreement with the experimental data. The above dependence allows us to justify the simultaneous existence of two planes of equal pressures, which has been experimentally confirmed for the initial stage of a fire in a pilot installation.

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The authors declare that there are no conflicts of interest present.