Experimental study of n-heptane/air combustion in meso-scale burners with porous media

Li, Junwei; Huang, Jinghuai; Yan, Mi; Zhao, Dan; Zhao, Jianxun; Wei, Zhijun; Wang, Ningfei

doi:10.1016/j.expthermflusci.2013.08.021

Cited by 60 publications

(14 citation statements)

References 29 publications

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“…Various strategies and methods have been carried out by researchers to stabilize the flame in the micro/mesoscale combustor or increase the stability of the flame. Aspects studied about the microcombustor are as follows: combustion using porous media [21,[26][27][28][29], combustion using a catalyst [18, [30][31][32][33], combustion using a flame holder [9,[34][35][36][37][38], combustion utilizing thermal circulation. Combustion with thermal circulation itself consists of two kinds, first namely thermal circulation accompanied by gas circulation [2,10,[39][40][41][42][43], included the swiss-roll type combustor [2,[43][44][45][46].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

The use of heat circulator for flammability in mesoscale combustor

Soegiharto

Wardana

Yuliati

et al. 2019

EEJET

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Мезомасштабна камера згоряння є частиною мало потужного електрогенератора. Функція мезомасштаб ної камери згоряння полягає в перетворенні вуглевод ня в теплову енергію в результаті реакції згоряння. Підтримання стійкості полум'я в мезомасштабній каме рі згоряння є важким через її міліметровий розмір. Метою даного дослідження є визначення продуктив ності і розпізнавання явищ мезомасштабних камер зго ряння, що мають теплові рециркулятори з нержавіючої сталі. Це дослідження призначене для перевірки особ ливостей згоряння рідкого та газового палива в мезока мерах згоряння, що використовують тепловий рецир кулятор. Тепловий циркулятор складається з труби з нержавіючої сталі з внутрішнім діаметром 3,5 мм. Спостережуваними параметрами були межі займисто сті, розподіл температури і візуалізація полум'я. Підтверджено, що тепловий рециркулятор з нер жавіючої сталі може використовуватися для підігріву і випаровування рідкого палива в мезомасштабній каме рі згоряння. Полум'я рідкого палива може стабілізува тися при коефіцієнті надлишку палива від 0,9 до 1,25 і приблизно до 900 градусів Цельсія. Таким чином, роз робка рекомендується для малопотужного рідкопалив ного генератора. Відзначено, що при занадто близько му розташуванні теплового рециркулятора до полум'я, відбувається надмірне охолодження полум'я, в резуль таті чого полум'я гасне. Мезокамера згоряння, яка не має теплового рециркулятора і призначена тільки для газового палива, здатна стабілізувати полум'я при кое фіцієнті надлишку палива 0,7-1,5 . Також підтвердже но, що неточний вибір матеріалу теплового рециркуля тора може привести до зниження стійкості полум'я. Важливо відзначити, що при виході газового палива з накопичувальної труби відбувається розширення та зниження температури, що може вплинути на межі займис тостіКлючові слова: мікрокамера згоряння, займистість, рециркуляція тепла, рідке паливо, малопотужний гене ратор UDC 536.3

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

The use of heat circulator for flammability in mesoscale combustor

Soegiharto

Wardana

Yuliati

et al. 2019

EEJET

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“…where Y H2 presents the yield of H 2 , S H2 presents the selectivity of H 2 that was calculated by Equation (6), and N H 2 ,out and N H 2 O,out respectively represent the number of moles of H 2 and gas-phase H 2 O in the exhaust products. X CH4 is the corresponding fuel conversion calculated by Equation (2).…”

Section: Exhaust Gas Analysismentioning

confidence: 99%

“…Besides, the porous medium plays an important role in heat accumulation, which helps the lean mixtures stabilize the flame and makes the flammability limits lower. A great number of studies report on combustion using porous burners [3][4][5][6]. Generally speaking, SiC or Al 2 O 3 honeycomb is inserted as the porous matrix inside the porous combustion burner.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Catalytic Combustion of Methane in a Microcombustor with Metal Foam Monolithic Catalyst

Luo

Liu

et al. 2018

Catalysts

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Utilizing catalysts in microcombustors is probably an excellent practical solution to stabilize fuel combustion because of the relatively fast reaction speed. In the present work, the monolithic catalyst Pd/A2O3/Fe-Ni with metal foam as matrix was used inside a 5 mm in diameter microcombustor. Then the effects of inlet velocity and equivalent ratio on catalytic combustion characteristics of methane were studied experimentally. The results showed that the methane and air mixture with the stoichiometric ratio Φ = 1.0 could be ignited at v = 0.2–0.6 m/s. The velocity of premixed mixture had a great influence on the catalytic combustion of methane. The larger the inlet velocity, the higher the temperature and the brighter the flame were. The experiment results also showed that the equivalence ratio had a large essential impact on the catalytic combustion, especially for the lean mixture of methane and air. It seemed the addition of the porous matrix with catalysts could significantly extend the limits of stable combustion. In the detection of exhaust gas, CO selectivity increased and CO2 selectivity decreased with the equivalence ratio. When Φ was between 0.94 and 1.0 m/s, a little amount of hydrogen was produced due to the lack of oxygen. The measured conversion of methane to CO and CO2 was very high, usually greater than 99%, which indicated the excellent performance of the catalyst.

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“…The experimental results are promising. And the energy harvesting techniques have potential to be applied on a thermoacoustic system with diffusion flames [37,38].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Feedback Control of Thermoacoustic Oscillations Using Least Mean Square-Based Algorithms

Zhang

Guan

2015

Journal of Low Frequency Noise, Vibration and Active Control

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Thermoacoustic instabilities are characterized by self-sustained largeamplitude pressure oscillations, which are produced by the interaction between unsteady heat release and acoustic waves. Such instabilities are detrimental to land-based gas turbine and aero-engines. To mitigate thermoacoustic instabilities, the coupling between unsteady heat release and pressure perturbations must somehow be interrupted. Feedback control techniques with a dynamic controller implemented can be used to achieve this. One of the most classical controllers is based on a finite-or infinite-impulse response filter, whose coefficients are optimized using least mean square algorithm (LMS). In this work we experimentally investigated and compared the performance of four LMS-based algorithms on stabilizing an unstable thermoacoustic system. Effects of the step size and filter length are studied one at a time. It is found that the filter length plays an important role in determining the convergence speed and steady error. In addition, the step size involved in the LMS algorithms is shown to be varied over a wide range. However, when the step size is small, simplified/revised LMS-based algorithms perform better than the conventional one in the absence of a feedback term. However, with the step size increased, these algorithms behave similarly. In order to improve the performance of conventional LMS-based algorithms, a time-varying step-size controller is developed and experimentally implemented. Approximately 50 dB sound reduction is achieved. The controller is also demonstrated to be able to track and prevent the onset of new limit cycle resulting from the changes of fuel flow rate. Finally, the transfer function of the thermoacoustic system is measured by injecting broad-band white noise.

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Experimental study of n-heptane/air combustion in meso-scale burners with porous media

Cited by 60 publications

References 29 publications

The use of heat circulator for flammability in mesoscale combustor

The use of heat circulator for flammability in mesoscale combustor

Experimental Study on Catalytic Combustion of Methane in a Microcombustor with Metal Foam Monolithic Catalyst

Experimental Investigation of Feedback Control of Thermoacoustic Oscillations Using Least Mean Square-Based Algorithms

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