Observation of local heat release rate with changing combustor pressure in the CH4/air flame (wrinkled laminar regime)

Kim, Jong-Ryul; Akamatsu, Fumiteru; Choi, Gyung‐Min; Kim, Duck-Jool

doi:10.1016/j.tca.2009.03.012

Cited by 12 publications

(9 citation statements)

References 18 publications

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“…In the flame region (jrj 6 15 mm), it has been shown that density fluctuations are largely dominated by heat release rate disturbances linked by Eq. (12). The LV yields then a signal which is proportional and in phase opposition to the contribution of the heat release rate integrated in the line-of-sight.…”

Section: Resultsmentioning

confidence: 99%

“…Light emission measurement of CH Ã or OH Ã radicals is a well established technique [4,5], which works well in perfectly premixed flames. However, the emission may depend on local equivalence ratio [6][7][8][9], turbulence intensity [9,10], flame front properties [11], and temperature and pressure [12][13][14][15]. As a consequence, for obtaining quantitative information of the heat release rates, the signals have to be calibrated in subsequent steps (see for instance [9,16,17] for different strategies).…”

Section: Introductionmentioning

confidence: 99%

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Interferometric determination of heat release rate in a pulsated flame

Leitgeb

Schuller

Durox

et al. 2013

Combustion and Flame

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interferometric determination of heat release rate in a pulsated flame

Leitgeb

Schuller

Durox

et al. 2013

Combustion and Flame

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“…With increasing altitude, the reduced atmospheric pressure can slow the fuel burning rate and make the coefficient increase. 11,24,25 Consequently, more unburned fuel diffuses toward the wall and rear of the furnace, which swells flame and increases H T and L T . As the altitude increases, the spectral absorption bands of the triatomic gas spectrum (CO 2 and H 2 O) get narrow, and the absorption coefficient decreases, as shown in Figure 6a.…”

Section: Temperature Distributionmentioning

confidence: 99%

“…As an intermediate species, the OH production and consumption is an important process of hydrocarbon fuel combustion, and its concentration can generally reflect the intensity of the combustion. 25 the OH distribution can be conducted by employing the height of rich OH zone (H OH ). It can be seen from Figure 8a-c that the ROZ in furnace moves back with increasing This indicates that the fuel diffusion velocity is accelerated at the low-pressure condition, and the combustion reaction was delayed.…”

Section: Combustion and Burnoutmentioning

confidence: 99%

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Zhang

et al. 2023

Asia-Pacific J Chem Eng

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The reduced atmospheric pressure and oxygen mass concentration at high altitudes have brought tremendous problems to the operation of gas‐fired boiler, mainly due to their influence on gas combustion and flow within furnace. Boilers designed for plateau region generally experience insufficient output, incomplete combustion, and reduced thermal efficiency when operating at high altitudes. However, the impacts from increasing altitude to the combustion characteristics within furnace are still ambiguous, which greatly hampers the boiler design for high‐altitude area. In this paper, the influences of altitude on the gas combustion characteristics within furnace were explored by using the computational fluid dynamics (CFD) method. The simulation shows that when altitude rises from 0 to 4000 m, the flame length and width increase as well as the temperature within furnace, but the burnout rate decreases due to the reduced residence time. The furnace length and diameter of the boiler designed for high altitudes should be appropriately increased to avoid the high temperature flame from scouring the back tube sheet and the furnace liner. While the CO emissions are generally very low, an increasing trend with altitude was observed. In addition, for each 1000 m of altitude rise, the NOx emissions increase by about 14 mg·m−3 at 100% loads and α = 1.05. The present work reveals the influence of altitude on combustion characteristics within gas‐fired boiler, which can guide the design and operation of the gas‐fired boiler at high altitudes.

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“…If this technique is to be applied to an automotive engine, it is behavior that must be characterized by considering the various parameters that affect the chemiluminescence intensity of the radical species. Known parameters that affect the chemiluminescence intensity of radical species associated with a flame are fuel composition, , equivalence ratio, ,− , temperature, − and pressure. − …”

Section: Introductionmentioning

confidence: 99%

Relationship between the Chemiluminescence Intensity Ratio of C₂* and CH*, Charge Pressure, and Equivalence Ratio for Gasoline

2018

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This work presents the results of an intensity-based fuel–air calibration for a range of charge pressures for gasoline fuel. The radical intensity ratio of diatomic carbon (C2 *) to methylidene (CH*) was acquired through line-of-sight chemiluminescence imaging at pressures up to 10 bar. Certified gasoline (99% iso-octane, 0.9% n-heptane, and 0.1% other additives) and air are injected into an optically accessible pressure vessel capable of handling pressures up to 200 bar and ignited with an automotive spark plug. Line-of-sight images of C2 * and CH* are recorded simultaneously on a single image sensor utilizing an intensifier, a high-speed camera, and various optical components to split the light signals associated with C2 * and CH* (centered at 513 and 427 nm, respectively). The ratio of the signals (C2 */CH*) are acquired and compared to the measured equivalence ratio of the exhaust gases and charge pressure. The approach allowed for characterization of the behavior of the intensity ratio at various charge pressures for gasoline. The comparison of the intensity ratio (C2 */CH*), equivalence ratio, and charge pressure resulted in the generation of a correlation map that can be used to calculate equivalence ratio if intensity ratio and charge pressure are known.

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Observation of local heat release rate with changing combustor pressure in the CH4/air flame (wrinkled laminar regime)

Cited by 12 publications

References 18 publications

Interferometric determination of heat release rate in a pulsated flame

Interferometric determination of heat release rate in a pulsated flame

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Relationship between the Chemiluminescence Intensity Ratio of C₂* and CH*, Charge Pressure, and Equivalence Ratio for Gasoline

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Observation of local heat release rate with changing combustor pressure in the CH4/air flame (wrinkled laminar regime)

Cited by 12 publications

References 18 publications

Interferometric determination of heat release rate in a pulsated flame

Interferometric determination of heat release rate in a pulsated flame

The influence of altitude on combustion characteristics within gas‐fired boiler by numerical simulation

Relationship between the Chemiluminescence Intensity Ratio of C2* and CH*, Charge Pressure, and Equivalence Ratio for Gasoline

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Product

Resources

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Relationship between the Chemiluminescence Intensity Ratio of C₂* and CH*, Charge Pressure, and Equivalence Ratio for Gasoline