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- W2188275338 abstract "This article presents the method of analyzing a mach 2 flow of air through a scramjet and over a cavity using hydroxyl tagging velocimetry (HTV). This method is of particular use in supersonic engines, where, fuel is ignited by a flame protected from airflow by a cavity. Emphasis of the experiment discussed is placed on the image analysis portion of the HTV experiments. The current software used to analyze laser intersections, created by Michigan State University, is user-intensive and inefficient because of the large number of inputs needed to produce a result. The conceptual method behind this imaging software is explained along with the mathematical algorithms related to the spatial correlation technique. The spatial correlation technique offers a way to determine the distance that an object has moved from one photograph to another. This work focuses on improvements to the dynamic analysis of images to expand the applicability of current software tools. The failures and successes of each method are explained. Hydroxyl tagging velocimetry (HTV) is the process of extracting the velocity vectors of an air flow by splitting apart water molecules in air and tagging the OH atom. The OH atom is tagged by taking a photograph of the molecule at an initial position and a final position over some time interval. The velocity vector of the molecule and airflow is determined by dividing the change in position by the finite time interval. Using the HTV process, Dr. Robert Pitz, Michael D. Lahr, and Zach W. Douglas determine how air flow, traveling at mach 2 in a scramjet nozzle, reacts when it encounters a small rectangular cavity of height 17 mm, width 153 mm, and length 66 mm. This cavity may be used in future systems to act as a place where a flame pilot may be used to ignite fuel. In a typical mach 2 flow, the flame would not ignite the fuel because it had no air-flow resistance. The cavity will be used to provide protection for the flame (Pitz et al. 2005, 6693). The experimental setup is as follows. Humid air is pushed through a two-dimensional nozzle at mach 2, with a flow rate of 1.4 kg/s, with isentropic conditions of a pressure of 22 kPa, and a temperature of 290 K. As the humid air flows into the testing section, an ArF excimer laser of approximately 193 nm photo-dissociates water molecules into OH and H atoms. The lasers used in the experiment consist of two sets of eleven split lasers intersecting at 121 points, positioned by using a beam splitter, mirror, 300 mm focal length cylindrical lens, and 300 mm focal length cylindrical lenslets. The OH tags may" @default.
- W2188275338 created "2016-06-24" @default.
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- W2188275338 date "2006-01-01" @default.
- W2188275338 modified "2023-09-27" @default.
- W2188275338 title "Methods of Dynamic Image Analysis for Hydroxyl Tagging Velocimetry" @default.
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- W2188275338 hasPublicationYear "2006" @default.
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