Quantitative Schlieren and its Applications as a Measurement Method in the Energy-Based Industry

Abstract

Quantitative Schlieren is a relatively underexplored measurement technique. Although the Schlieren method has been established since the mid-20th century, its quantitative advantages have become more apparent with advancements in image post-processing. This post-processing generates a density map that can be converted into maps for temperature and pressure specific to the observed phenomena. Because the method is non-intrusive, it requires minimal auxiliary equipment—such as cables or transducers—and eliminates the need for consumables typically associated with pressure probe calibration. The non-intrusive nature of the method minimizes measurement errors, as it does not disrupt the flow where pressure probes are used, and relies solely on optical equipment, which is versatile for various experimental setups. This presents an entrepreneurial opportunity to develop a wind tunnel for pressure probe calibration, allowing for the design and calibration of probes with specific geometries. Such an innovation would contribute to a more environmentally friendly industry and position Romania among European nations capable of sustainable pressure probe production and calibration.