In-cylinder measurement of mixture maldistribution in a L-head engine

Chou, Tachih; Patterson, Donald J.

doi:10.1016/0010-2180(94)00174-q

Cited by 47 publications

(29 citation statements)

References 3 publications

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“…Chemiluminescence-based fuel-air ratio measurements are becoming a standard approach in industrial applications as several researchers have employed this technique in internal combustion engines and model gas turbine combustors [9][10][11][12][13]. A principle idea for the chemiluminescence-based F/A sensing is to use the ratio of the chemiluminescence intensity of one species to another such as OH(A) to CH(A) [11,14,15].…”

Section: Introductionmentioning

confidence: 99%

Basic aspects of OH(A), CH(A), and C2(d) chemiluminescence in the reaction zone of laminar methane–air premixed flames

Kojima

Ikeda

Nakajima

2005

Combustion and Flame

193

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Section: Introductionmentioning

confidence: 99%

Basic aspects of OH(A), CH(A), and C2(d) chemiluminescence in the reaction zone of laminar methane–air premixed flames

Kojima

Ikeda

Nakajima

2005

Combustion and Flame

193

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“…Usually two laser beams, with one in the infrared light range and the other in the visible-light (VIS) range, are used. Chemiluminescence from radial species has been used to determine equivalence ratios for different combustion systems, including premixed laminar, premixed turbulent, and even spray flames [7][8][9]. Compared with PLIF and absorption measurements, chemiluminescence-based methods do not require a complicated optical setup.…”

Section: Introductionmentioning

confidence: 99%

Flame Spectra of a Turbulent Liquid-Fueled Swirl-Stabilized Lean-Direct Injection Combustor

Santavicca

2009

Journal of Propulsion and Power

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Flame spectra within the UV/visible-light range are measured for a turbulent, liquid-fueled, swirl-stabilized, leandirect injection combustor. The flame spectra are quite similar to those of lean premixed combustion, which can be attributed to the small droplet size and fast fuel/air mixing. Broadband background emissions around 431 nm, which mainly consist of CO 2 chemiluminescence, are found to be self-similar with wavelength for both stable and unstable combustion. Chemiluminescence from OH , CH , and CO 2 is found to be a nonlinear function of the airflow rate, the equivalence ratio, preheat temperature, and pressure. Procedures for the determination of the instantaneous heat release rate and equivalence ratios along the flame front are developed. For both combustion instability and forced flame responses, the prediction errors are within 2.0% in the mean heat release rate, the mean air consumption rate, and the mean equivalence ratio. The assumption that chemiluminescence is proportional to the instantaneous heat releaser rate is generally invalid. Probably the proportionality is valid only in the weakly turbulent or wrinkled flamelet region in the absence of equivalence ratio variations and strong acoustic oscillations. NomenclatureCHs = Laplace transform of CH chemiluminescence It = instantaneous chemiluminescence intensity, AU L f = curvilinear flame front _ m a t = instantaneous air consumption rate, g=s _ m a t = instantaneous air consumption rate divided by 100 g=s pt = instantaneous combustor pressure divided by the atmospheric pressure p 0 a t = acoustic pressure near the heat release zone, Pa p f t = instantaneous fuel pressure 0.29 m upstream of the fuel nozzle, Pa _ Q R t = instantaneous heat release rate, kW S L = laminar burning velocity, m=s s = symbol of the Laplace transform T = mean temperature in the heat release zone, K T 0 a t = acoustic temperature near the heat release zone, K T i = preheat temperature, K Xs = Laplace transform of xt jWsj = gain of the transfer function Ws Ws = phase angle of the transfer function Ws, deg = thermal diffusivity, m 2 =s H R = lower heating value of fuel, J=kg L = thickness of the laminar flame, m = fuel/air equivalence ratio = wave length divided by 431 nm = wavelength, nm a = air density, kg=m 3 u = reactant density, kg=m 3 c = chemical reaction time, s

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“…The latter represent the dominating physical quantity which considerably determines the stability of combustion processes [7]. Furthermore, in various investigations it was shown that ratios of chemiluminescence intensities I CH * /I OH * [5,8] and I C2 * /I CH * [9,10] are measures for the equivalence ratio which represents an ultimate parameter for diffusion flames. Therefore, chemiluminescence measurements are a prospective tool for non-intrusive diagnostic of combustion phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…LIF (Laser-induced Fluorescence), Rayleigh-and Raman-scattering, CARS (Coherent Anti-Stokes Raman-Scattering) or DFWM (Degenerate Four-Wave Mixing) etc., the utilization of chemiluminescence in combustion research has gained increasing interest during the last two decades: E.g. the chemiluminescence of OH * in premixed laminar and moderate turbulent hydrocarbon flames [3][4][5][6][7][8][9] was found to be correlated with heat release rates. The latter represent the dominating physical quantity which considerably determines the stability of combustion processes [7].…”

Section: Introductionmentioning

confidence: 99%

Tomographic reconstruction of 2D-OH∗-chemiluminescence distributions in turbulent diffusion flames

2012

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A recently developed fast tomographic reconstruction device (Anikin et al. in Appl. Phys. B 100:675, 2010) has been applied to detect 2-D chemiluminescence distributions of OH * in reaction zones of a near laminar and a turbulent diffusion flame. A series of single-shot experiments has been carried out in both flames offering cold gas flow velocities of 0.43 m/s and 4 m/s and flame diameters up to 60 mm, respectively.The emission of OH * -chemiluminescence originating from the reaction zones of the flame fronts was registered by ten Kepler-telescopes surrounding the object under investigation at different pre-defined angles. The signals emerging from each telescope are collected by a fiber cable consisting of 90 single fibers arranged side by side in a single row, respectively. The signals originating from the ten cables/10 × 90 = 900 fibers represent the corresponding Radon transforms. These signals are imaged by a relay-optics onto the photocathode of a single image intensified CCD-camera. The output data of the camera are used for the reconstructions of the 2D-distributions of OH * -emission using a numerical procedure solving the inverse problem of tomogra-N.B. Anikin · R. Suntz ( )

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In-cylinder measurement of mixture maldistribution in a L-head engine

Cited by 47 publications

References 3 publications

Basic aspects of OH(A), CH(A), and C2(d) chemiluminescence in the reaction zone of laminar methane–air premixed flames

Basic aspects of OH(A), CH(A), and C2(d) chemiluminescence in the reaction zone of laminar methane–air premixed flames

Flame Spectra of a Turbulent Liquid-Fueled Swirl-Stabilized Lean-Direct Injection Combustor

Tomographic reconstruction of 2D-OH∗-chemiluminescence distributions in turbulent diffusion flames

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