Pressure Drop of Perforated Orifice in Single-Phase Flow

This study studied the performance of perforated orifices by a new method, namely field synergy theory (FST). Pressure loss was obtained theoretically by connecting flow field and pressure loss, and pointed out the direction to optimization. To validate the theory, pressure loss was measured experimentally under different orifice structures by changing the parameters of porosity, thickness, hole diameter, hole distribution, and etc. Theoretical results showed that pressure loss was determined by the synergy of velocity and velocity gradient over the flow field passing the orifice. Pressure loss increased as the synergy being stronger. To decrease pressure loss, it was the most effective to decrease the synergy with the biggest weight. The comprehensive performance of a perforated orifice is better than a standard one. All the structure parameters should be optimized to improve the performance of a perforated orifice.