Application of pressure-sensitive paint to low-speed flow around a U-bend of strong curvature

作者：Quinn Mark Kenneth^*; Gongora Orozco Nalleli; Kontis Konstantinos; Ireland Peter

来源：Experimental Thermal and Fluid Science, 2013, 48: 58-66.

DOI：10.1016/j.expthermflusci.2013.02.008

• PSP
• Low-speed
• U-bend flow

Pressure measurements are traditionally made using pressure taps connected to a transducer. These measurements are labor-intensive, expensive and only yield discrete values. Pressure-sensitive paint is a method of optically measuring the pressure across an entire model. Originally designed for use in transonic flow, pressure-sensitive paints are absolute pressure sensors. Therefore, application of pressure-sensitive paint to low-speed flow represents a significant challenge to researchers. This study investigates the surface pressure distribution around a U-bend of sharp curvature with three different inlet velocities: 29.7, 21.5 and 12.0 ms(-1). The absolute accuracy of the paint has been measured and compared with previously published literature and empirical relations. The paint was excited using two LED lamps, and full-field pressure maps have been gathered using a CCD camera. The absolute accuracy of the pressure measurements is ultimately limited by CCD shot noise, but is more commonly limited by the temperature-induced error and the microheterogeneity of the painted surface.

• 出版日期2013-7