Influence of leading edge bluntness on hypersonic flow in a generic internal-compression inlet

Abstract

Flow and heat transfer inside a generic inlet are investigated experimentally. The cross section of the inlet is rectangular. The inlet is installed on a §at plat at a signi¦cant distance from the leading edge. The experiments are performed in TsAGI wind tunnel UT-1M working in the Ludwieg tube mode at Mach number M ∞ = 5 and Reynolds numbers (based on the plate length L = 320 mm) Re ∞L = 23 · 10 6 and 13 · 10 6 . Steady §ow duration is 40 ms. Optical panoramic methods are used for investigation of §ow outside and inside the inlet as well. For this purpose, the cowl and one of two compressing wedges are made of a transparent material. Heat §ux distribution is measured by thin luminescent Temperature Sensitive Paint (TSP). Surface §ow and shear stress visualization is performed by viscous oil containing luminophor particles. The investigation shows that at high contraction ratio of the inlet, an increase of plate or cowl bluntness to some critical value leads to sudden change of the §ow structure.

Starting of generic inlet with blunted wedges

“…The above described methods are applied in the present work similar to [16] for investigation of external and internal §ow as well. To do that, some parts of the cowl and one wedge were made of a material transparent to the exciting ultraviolet (UV) light and to the luminescent visible light.…”

“…The present paper is the completion of studies started in [15] and continued in [16]. The subject of the study in [15] was a pair of wedges located on sharp or blunt plate.…”

“…The subject of the study in [15] was a pair of wedges located on sharp or blunt plate. In [16], the pair of wedges was replaced by the inlet and the in §uence of plate-and cowl-bluntness on the §ow was investigated. In the present paper, the same model as in [16] was used, but the study is focused on the wedgebluntness e¨ect on the inlet starting.…”

“…In [16], the pair of wedges was replaced by the inlet and the in §uence of plate-and cowl-bluntness on the §ow was investigated. In the present paper, the same model as in [16] was used, but the study is focused on the wedgebluntness e¨ect on the inlet starting. Figure 1 presents the experimental model.…”