Flames, Their Structure, Radiation and Temperature (Second Revised Edition)

Gaydon, A. G.; Wolfhard, H. G.; Penner, S.S.

doi:10.1115/1.3644062

Cited by 38 publications

(34 citation statements)

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“…In general, the flame zone is composed of the reaction zone and pre-heated zone (Williams, 1994), (Takeno and Bray, 2008) which both emit light at varying peak wavelengths according to the dominant emission source (Gaydon and Wolfhard, 1979). With the filtered images, it is impossible to distinguish the 430 nm filtered light as emissions from CH radicals and background emissions.…”

Section: Visualization Of Luminous Thicknessmentioning

confidence: 99%

“…With the filtered images, it is impossible to distinguish the 430 nm filtered light as emissions from CH radicals and background emissions. The filter also has a width of permeability, so it is inappropriate to consider the luminousity of the image as any representation of the flame zone or reaction zone (Gaydon and Wolfhard, 1979). When making qualitative comaprisons though, the luminous area in the images can be used as a measure of the luminous intensity emitted from the reaction, convinient for providing a measure of the amount of light reaching the camera lens.…”

Section: Visualization Of Luminous Thicknessmentioning

confidence: 99%

“…The flame was observed using a Canon iVIS HF G10 video camera with Kenko MC No.3 close up lens and Asahi bunko MZ0430 430 nm band pass filter with 10 nm FWHM. This configuration was choosed to capture the luminous intensity of CH radical (Gaydon and Wolfhard, 1979). The filtered images were filmed with a consistent setting of aperture stop F2.8 and frame rate 30 fps.…”

Section: Research Objectivesmentioning

confidence: 99%

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Effect of combustion pressure on regression rate of solid fuel under an impinging oxidizer jet counterflow diffusion flame

Terakawa

Saito

Nakamura

et al. 2014

JTST

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Flame spread and counterflow diffusion flame experiments are widely conducted to investigate the combustibility of solid fuels. Although the use of the gas phase Damköhler number to organize the flame spread rate or regression rate of a solid fuel is effective under constant pressure, some research point out the possibility that the combustion pressure may be an independent factor in determining the regression rate. This research employs a counterflow diffusion flame to investigate the effects of combustion pressure on regression rate, and clarifies the deviation of results using the classical Damköhler number under varying pressures. First, a numerical flow analysis was conducted to determine the oxidizer velocity gradient near the fuel surface, which is an essential factor in evaluating the non-dimensional regression rate. Next, using an enclosed combustion chamber with independently variable oxidizer flux and pressure, experiments with a quasi two-dimensional flame were conducted with polyethylene solid fuel and nitrogen diluted oxygen oxidizer, and the regression rate was measured for two experiment series, constant pressure, and constant oxidizer flux. By comparing the two series, the effect of pressure on non-dimensionalized regression rate is clarified. The results suggest that contrary to the theoretical reaction rate of the gas phase, the non-dimensional regression rate increases when the combustion pressure is decreased, even in the thermal regime. This suggests that the classic method of organizing the regression rate with Damköhler number in thermal regime could not be implemented with varying pressure conditions, possibly due to the change in diffusion rates involved with varying pressures.

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Section: Visualization Of Luminous Thicknessmentioning

confidence: 99%

Section: Visualization Of Luminous Thicknessmentioning

confidence: 99%

Section: Research Objectivesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of combustion pressure on regression rate of solid fuel under an impinging oxidizer jet counterflow diffusion flame

Terakawa

Saito

Nakamura

et al. 2014

JTST

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“…결과 및 토의 화염안정성 3.1 연료조성 변화에 따라 연소기에 영향을 미치는 요소 중에는 화염안정성과 발열량 그리고 유량 등이 있다. (8) 화염안정성은 화염의 연소상태를 나 타내는 것으로 연소기의 작동영역을 결정짓는 중 요한 요소 중 하나이다. (9,10) 연소는 유동과 화학반 응의 상호작용이므로 유동에 영향을 미치는 기하 학적 요소들과 화학반응에 영향을 미치는 압력, 온도 반응물의 조성 등이 복잡하게 얽혀 서로 영 , 향을 미치기 때문이다.…”

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Characteristics of Non-premixed Synthetic Natural Gas-Air Flame with Variation in Fuel Compositions

Oh¹,

Dong²,

Yang³

2013

Transactions of the Korean Society of Mechanical Engineers B

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“…KovAcs and FELTHAM [1] took the numerical values of ~ and fl to be 1/3 and 2.24, respectively, but they indicated that these values were underestimated because the mean torsional strain was evaluated on the assumption that the wire was purely elastic: they pointed out that GAYDON'S [3] assumption of ideal plasticity would be more appropriate. Recent work [4,5] has indicated that the values of ~ and fl are 2~/3 and 3, respectively.…”

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confidence: 99%

Validity of Kovács and Nagy’s equation as a measure of the total equivalent mean shear strain in twisted 99.7% Al wires

1971

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KovXcs and FErTtIAM [1] and Kov 93 and NAGY [2] derived an equation for the total equivalent mean shear strain ~ of a wire plastically twisted about its axis at constant tensile load. In this equation ~ consists of a torsional shear strain ND/L and the shear strain component equivalent to the associated tensile strain dL/L o, as follows:where N is the number of turns of twist, D is the diameter of the wire, L o and L ate the initial and instantaneous lengths of the wire, ~ and/~ are constants. KovAcs and FELTHAM [1] took the numerical values of ~ and fl to be 1/3 and 2.24, respectively, but they indicated that these values were underestimated because the mean torsional strain was evaluated on the assumption that the wire was purely elastic: they pointed out that GAYDON'S [3] assumption of ideal plasticity would be more appropriate. Recent work [4,5] has indicated that the values of ~ and fl are 2~/3 and 3, respectively. Eq. (1) can be written in the form:,JLILo = --(~I~)mblL + Ylt~ of C = --(~/~)e + y/~,where C = AL~Lo and O = ND/L.

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Flames, Their Structure, Radiation and Temperature (Second Revised Edition)

Cited by 38 publications

References 0 publications

Effect of combustion pressure on regression rate of solid fuel under an impinging oxidizer jet counterflow diffusion flame

Effect of combustion pressure on regression rate of solid fuel under an impinging oxidizer jet counterflow diffusion flame

Characteristics of Non-premixed Synthetic Natural Gas-Air Flame with Variation in Fuel Compositions

Validity of Kovács and Nagy’s equation as a measure of the total equivalent mean shear strain in twisted 99.7% Al wires

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