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Applications of Laser-Induced Fluorescence Spectroscopy for Combustion and Plasma Diagnostics
Published in Leon J. Radziemski, Richard W. Solarz, Jeffrey A. Paisner, Laser Spectroscopy and Its Applications, 2017
Fluorescence imaging was also used to study the interaction of a flame propagating out of a small cylindrical prechamber into a stagnant, stoichiometric methane-air mixture (Cattolica and Vosen, 1986). The experimental apparatus is shown in Fig. 9.15. A portion of the input beam was directed onto a diode array to correct for nonuniformities in laser intensity along the laser sheet. OH concentration fields were measured outside the prechamber at various times after ignition, providing important information on the interaction of fluid mechanics and chemistry during flame propagation. The fluid mechanics of the flame propagation were also studied using Schlieren photography.
Explosive Flows: Shock Tubes and Blast Waves
Published in Wen-Jei Yang, Handbook of Flow Visualization, 2018
Schlieren photography has been used in shock-wave research primarily to identify the positions of shock fronts, contact surfaces, and vortices. Limited use has been made of colored schlieren, in which the aperture is replaced by a multicolored filter [31–34] to better visualize small variations of the gas density. Complete and up-to-date descriptions of colored schlieren and its application to the study of shock waves are given by Kleine and Grönig [35, 36].
Experimental Investigation of Turbulent Flame Propagation and Pressure Oscillation in a Constant Volume Chamber Equipped With an Orifice Plate
Published in Combustion Science and Technology, 2018
Haiqiao Wei, Dongzhi Gao, Lei Zhou, Jianfu Zhao, Rui Chen
The combustion chamber was a closed cylindrical cavity with an inner diameter of 100 mm and length of 230 mm. Replaceable orifice plates with different aperture sizes were installed in the combustion chamber to accelerate the flame and promote the formation of turbulent flame. The orifice plate was constructed using a 3-mm-thick stainless-steel plate with several through-holes in it, which were distributed in a rectangular configuration (18 rows, 14 columns). For safety reasons, an 8-MPa pressure-release valve was installed in the combustion vessel. The entire vessel was uniformly preheated by a set of electrical heating elements with a total power of 2 kW. With the help of a closed-loop feedback controller, the combustion chamber was heated to the target temperature within 2 K. The mixture was ignited using a slightly modified standard ignition plug with extended electrodes. The ignition system generated a spark with a duration of 0.7 ms. The combustion images were recorded by the image acquisition system using high-speed Schlieren photography technology at the frame rate of 90,000 fps and exposure time of 1 µs. The high-speed Schlieren photography technology can capture the density field and was widely used to capture flame and shock wave. The pressure rise during the combustion process was recorded using a Kistler 6113B pressure transducer at 100 kHz. With the help of the synchronization controller, the spark plug, the pressure recording system, and the high-speed camera started to work at the same time.