... swirl combustor. Experiments were conducted at two global equivalence ratios (Φ = 0.24 and Φ = 0.40), focusing on laminar flame speed (LFS) and flame properties through chemiluminescence imaging and modal analysis techniques. The primary objective was to understand how these nano-additives modulate...

...Eric Petersen; Madeleine Kopp; Nicole Donato; Felix Güthe Chemiluminescence continues to be of interest as a cost-effective optical diagnostic for gas turbine combustor health monitoring. However, most chemical kinetics mechanisms of the chemiluminescence of target species such as OH*, CH*, and CO...

... study, combustion of pure methane and blended methane-hydrogen with hydrogen-levels up to 80% by volume has been conducted in a swirl stabilized premixed combustor. Particle imaging velocimetry (PIV) and OH* chemiluminescence imaging have been used in this study. Results show that there is a single...

..., 130 (1), pp. 011505; Lammel et al., 2010. “FLOX ® Combustion at High Power Density and High Flame Temperatures,” ASME J. Eng. Gas Turbines Power, 132 (12), p. 121503 ff ). The analysis was accomplished by different laser measurement techniques. Flame structures were visualized by OH* chemiluminescence...

... of the flame during its upstream motion, tests were done on an atmospheric combustion test rig providing almost complete optical access to the mixing section as well as the flame tube. OH * chemiluminescence, HS-Mie scattering and ionization detectors were applied and undiluted H 2 was used as fuel...

... parameter is varied, the system undergoes a series of bifurcations leading to characteristically different nonlinear oscillations. Through the application of nonlinear time series analysis to pressure and flame (CH* chemiluminescence) intensity time traces, these oscillations are characterized as periodic...

..., the heat release by OH chemiluminescence imaging and the temperatures by coherent anti-Stokes Raman scattering. Two flames are compared: a fuel-rich partially premixed flame with moderate soot concentrations and a second one with the same parameters but additional injection of secondary air. Instantaneous...

...Martin Lauer; Mathieu Zellhuber; Thomas Sattelmayer; Christopher J. Aul Imaging of OH* or CH* chemiluminescence with intensified cameras is often employed for the determination of heat release in premixed flames. Proportionality is commonly assumed, but in the turbulent case this assumption...

... forcing power with velocity fluctuations of up to 100% of the mean flow. The test rig consists of a generic combustor with a premixed swirl-stabilized natural gas flame, where the upstream part has a variable length to generate adaptive resonances of the acoustic field. The OH ∗ chemiluminescence response...

... imaging of the OH ∗ chemiluminescence associated with the igniting flame kernels at a frame rate of 5 kHz. The flow-field characteristics were determined by high-speed particle image velocimetry and Schlieren images. Furthermore, high-speed imaging of laser-induced fluorescence of OH was applied...

... in the development process of low NO x combustion systems. The proposed method is particularly useful in harsh environments. It makes use of simultaneous measurement of the chemiluminescence of different species in order to obtain the heat release fluctuations via inverse method. Generally, the heat release...

...Martin Lauer; Thomas Sattelmayer The determination of the heat release in technical flames is commonly done via bandpass filtered chemiluminescence measurements in the wavelength range of OH ∗ or CH ∗ radicals, which are supposed to be a measure for the heat release rate. However, these indirect...

...Kyu Tae Kim; Jong Guen Lee; Hyung Ju Lee; Bryan D. Quay; Domenic A. Santavicca Flame transfer function measurements of turbulent premixed flames are made in a model lean-premixed, swirl-stabilized, gas turbine combustor. OH ∗ , CH ∗ , and CO 2 ∗ chemiluminescence emissions are measured to determine...

... and operated with preheated air at various thermal powers P , equivalence ratios Φ , and pressures up to p = 6 bars . For the visualization of the flame emissions OH ∗ chemiluminescence imaging was applied. Absolute flow velocities were measured using particle image velocimetry (PIV), and the reaction zones...

...-induced fluorescence imaging of OH radicals and chemiluminescence imaging, and spontaneous Raman scattering. The results indicate that the combustor has two stabilization regions, with the primary region downstream of the injector where there are low average velocities and high turbulence levels where...

... * chemiluminescence imaging and planar laser-induced fluorescence of OH were applied in order to characterize the flame zone and the relative temperature distributions. The combustion behavior was investigated as a function of equivalence ratio and fuel composition, and the influence of the gas inlet velocity...

... diameters ranging from 45 μm to 180 μm. The overall flame structure was visualized with time-averaged OH chemiluminescence and soot luminosity images acquired during the quasi-steady portion of the diesel combustion event that occurs after the transient premixed burn is completed and the flame length...

... disturbances. A photomultiplier recorded the OH * chemiluminescence of the flame. For the agreed operating conditions frequency scans of these values were registered. Additionally images of the OH * chemiluminescence were taken at selected frequencies and evaluated in a statistical manner, to separate...