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.
Temperature measurement based on fluorescence intensity in hydroxyl tagging velocimetry (HTV)