An Experimental Study Of The Vortical Structures In Supersonic Steam Jet Impinged On To The Wall

This study presents an experimental investigation into the impingement of a supersonic steam jet onto a wall. Steam was injected through a supersonic nozzle at a varying total pressure of 1.5-3.0 bars, producing a supersonic steam jet at a pressure gradient of 0.5-2.0 bars. The whole fluid domain is comprised of two regions: the jet region and the region near the wall involving the impingement of the supersonic steam jet. Within this region, the transformation of primary vortices into secondary vortices occurs and these vortices expel outward in the radial direction after impingement. Measurements have shown the spreading of the normalized density of the vortical structures along the axial length within the region near the wall. However, the probability density function analysis has indicated that the vortical structures become denser within the impingement region. Whereas subsequent to an impingement of the steam jet onto the wall, along the radial direction, weak traces of their existence in the jet region may be attributed to the vorticity diffusion within the jet region.