Figure 3
From: Preventing a global transition to thermoacoustic instability by targeting local dynamics

Schematic of the bluff bodies. (a) Baseline bluff body without slots. (b) Bluff body with slots near the center—inner slot bluff body (IS). (c) Bluff body with slots near the edge of the circle—outer slot bluff body (OS). Both slotted bluff bodies have the same area of slots.