An experimental study on the onset processes of detonation waves downstream of a perforated plate

Qin, Hui; Lee, John H. S.; Wang, Zhenguo; Zhuang, Fengchen

doi:10.1016/j.proci.2014.07.056

Cited by 26 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, in the process of flame propagation, there are various combustion phenomena induced by flame instabilities, shock waves, and pressure waves. [23][24][25][26][27][28][29] Autoignition is a typical destructive abnormal combustion phenomenon. There are extensive studies [30][31][32][33][34][35][36][37][38][39][40][41][42] on autoignition but there has not been agreed on conclusion due to its inherent randomness and complicated physical mechanism.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

Zhang

Wang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

The aim of this paper is to analyze local autoignition induced by secondary flame acceleration. The secondary flame acceleration process and the local autoignition formation mechanism at the condition of the secondary flame acceleration propagation were investigated by utilizing an improved designed constant volume combustion bomb (CVCB) with two perforated plates. Primary flame and secondary flame propagation were recorded via high‐speed schlieren photography. The results showed that there were three distinct stages in the process of flame propagation through two perforated plates, which were the primary jet flame stage, secondary jet flame stage, and flame‐shock interaction stage. The morphologies of the flame were analyzed by high‐speed Schlieren images, flame velocities, and pressure oscillation including primary jet propagation, secondary flame formation and acceleration, and location autoignition. Results show the effect of initial pressure on flame propagation, flame velocity, and pressure oscillation. Acceleration of secondary flame and local autoignition phenomenon was more precisely demonstrated as unburnt gases were compressed by flame waves (different velocities) with initial pressure increasing. Based on the morphology of flame, three different types of flame combustion modes were captured at different initial pressure involving turbulent flame, deflagration, and quasi‐detonation. The present work might provide a new insight for combustion science in a confined space, such as autoignition due to compression effect of secondary jet flame and primary flame interaction. It also provides the theory guidance and research direction towards further studies on propane storage vessel deflagration.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Indeed, in the process of flame propagation, there are various combustion phenomena induced by flame instabilities, shock waves, and pressure waves 23–29 . Autoignition is a typical destructive abnormal combustion phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

Zhang

Wang

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

“…A controlled detonation initiation in certain propulsion systems could revolutionize transportation (e.g. pulse detonation engines (PDEs)), whereas uncontrolled detonations can destroy facilities and result in disasters [10][11][12][13], such as gas explosions during mining operations and knocks in downsized spark ignition engines.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the stochastic nature of end-gas autoignition with detonation development in confined combustion chamber

Zhao

Zhou

Zhong

et al. 2019

Combustion and Flame

View full text Add to dashboard Cite

In the present work, end-gas autoignition formation, and the effects of oxygen concentration on the flame/shock waves propagation and pressure oscillation, are investigated in a self-designed constant-volume chamber equipped with a perforated plate. A hydrogen-oxygen-nitrogen mixture with adjustable oxygen to nitrogen ratio is chosen as the test fuel. In an oxygen-enriched condition, the probability of an end-gas autoignition occurrence increases significantly. End-gas autoignition with detonation development is further investigated, with a special emphasis on the stochasticity of the detonation development. In a low-oxygen condition, detonation occurs randomly owing to its stochastic physical behavior. However, when the oxygen concentration increases to 28%, the stochastic factors have a lower impact, and the detonation occurrence is certain. Nevertheless, the pressure and pressure oscillation in the autoignition exhibit random behaviors and are unrelated to the oxygen concentration. The variation tendency of the flame tip velocity remains constant under different oxygen concentrations. However, an increase in the oxygen concentration improves the flame tip velocity, thereby inducing stronger shock waves and promoting autoignition. Based on the start time of the autoignition, two types of autoignition modes were identified: Mode 1 and Mode 2. In Mode 2, the unburnt mixture experiences merely one compression by the shock wave before autoignition and only occurs under high oxygen concentrations of 27%-28%. Under equal oxygen concentrations, the pressure and pressure oscillation of Mode 2 are higher than those of Mode 1 owing to the larger amount 2 of unburnt mixture. Finally, the exhaust gas was introduced into the initial unburnt mixture to investigate the effect of an inert gas on the combustion.

show abstract

“…Так, в рамках развития атомно-водородной энергетики высока потребность в разного рода конструктивных решениях как элементах пассивной системы безопасности. Исследования показали, что для разрушения распространяющейся детонационной волны можно использовать завесы из нереагирующих частиц пыли [1], помещенные в газ неподвижные инертные частицы или облака частиц [2,3], щелевые пластины [4], перфорированные стенки [5,6], различные пористые вставки на внутренней поверхности канала [7][8][9]. Разрушающее воздействие на волну оказывают также расположенные в канале барьеры.…”

unclassified

Гашение Детонационного Горения Водородно-Воздушной Смеси В Плоском Канале

Левин¹,

Журавская²

2023

Письма В Журнал Технической Физики

View full text Add to dashboard Cite

Представлены результаты численного исследования взаимодействия сформированной ячеистой волны детонации, распространяющейся в заполненном покоящейся стехиометрической водородно-воздушной смесью плоском канале, с расположенными на внутренней поверхности канала множественными препятствиями (барьерами). Исследовано влияние геометрических параметров области с препятствиями на распространение детонации. Обнаружено, что локализация препятствий в углублении стенки канала приводит к снижению их разрушающего воздействия на волну. Изучена возможность гашения детонации расположенным вдоль стенки канала слоем воздуха, ограниченным одиночными барьерами. Установлено, что заполнение области с серией барьеров воздухом или аргоном усиливает их разрушающее воздействие на волну, способствуя тем самым гашению детонационного горения. Ключевые слова:: плоский канал, детонация, множественные препятствия, слой воздуха, разрушение детонации.

show abstract

An experimental study on the onset processes of detonation waves downstream of a perforated plate

Cited by 26 publications

References 6 publications

Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

Flame propagation behavior of propane–air premixed combustion in a confined space with two perforated plates at different initial pressures

Experimental investigation of the stochastic nature of end-gas autoignition with detonation development in confined combustion chamber

Гашение Детонационного Горения Водородно-Воздушной Смеси В Плоском Канале

Contact Info

Product

Resources

About