Electrically-heated flat plate testing in a free-piston driven shock tunnel

Hypersonic shock impingement on a heated flat plate at Mach 7 flight enthalpy

“…The boundary layer height () at the shock impingement location () for Condition A was found to be and for the unheated ( K) and heated ( K) wall cases, respectively, based on our previous results (Chang et al. 2020). When heated, the boundary layer thickened and formed ‘rope-like’ structures at a more upstream location.…”

“…In the recent flat plate testing of Chang et al. (2020), a thicker boundary layer formed when the wall was heated. A heated, thicker boundary layer has a lower density.…”

“…Further information regarding the design and testing of the heated flat plate is provided in Chang et al. (2020). In addition to the heated plate, an unheated instrumented plate was also utilised to obtain the quantitative surface data.…”

“…For optical diagnostics, schlieren and an infrared (IR) thermography system were employed to characterise the flow field and plate temperature, as described in Chang et al. (2020). The schlieren field of view is shown in figure 1.…”

“…In recent work (Chang et al. 2020), the authors found that the flat plate boundary layer thickened with higher from the hypersonic flow testing of a heated flat plate. In the present study, the authors installed a shock generator to generate a strong oblique shock to separate the flat plate boundary layer.…”