Aeroacoustic resonance in a rectangular cavity: Part 2 Effect of yaw and of leading and trailing edge angles

Experimental results of flow over a generic 'open' rectangular cavity having lengths of 200 and 250 mm and a depth and width of 50mm at Mach numbers ranging between 0.3 to 1.3 was reported in Part 1 [1]. In this paper, Part 2, the effect of yawing these rectangular cavities is investigated, as well as how the yawing resonant behaviour changes when the shorter cavity is transformed to a range of parallelograms by changing the leading and trailing edge angles while keeping the length to depth and width ratios fixed. The results show that small leading and trailing edge angles changes of up to 15 degrees have a small influence on resonance behaviour and for the two largest angles, 30 degrees and 45 degrees, the magnitude of resonances are suppressed at a zero yaw.