Abstract Flow regimes and mixing characteristics in non-aligned T-jets reactors were investigated by Planar Laser Induced Fluorescence (PLIF) at 30 ≤ Re ≤ 400. The misalignment of inlet jets in non-aligned T-jets reactors leads to a steady engulfment flow at low Reynolds numbers. With the increase of Re, the unsteady engulfment flows with different oscillation behaviors occur. Unlike the vortex-merging oscillation in reactors of ws/h = 0 and 0.5 (ws and h are the misalignment degree and height of inlet jets), an S-shaped self-excited oscillation is identified in reactor of ws/h = 1. Mixing in non-aligned T-jets reactors is quantified by time-averaged Intensity of Segregation (IOS) and the mixing mechanism is revealed. The mixing is significantly enhanced in non-aligned T-jets reactors at low Re due to the earlier emergence of the steady engulfment flow. Both the vortex-merging oscillation in reactors of ws/h = 0 and 0.5 and the S-shaped self-excited oscillation in reactor of ws/h = 1 contribute to the mixing enhancement.

中文翻译：

---

非对齐 T 射流反应器中的流态和混合特性

摘要 利用平面激光诱导荧光 (PLIF) 在 30 ≤ Re ≤ 400 下研究了非对齐 T 射流反应器中的流态和混合特性。非对齐 T 射流反应器中入口射流的错位导致稳定的吞没流在低雷诺数下。随着 Re 的增加，出现具有不同振荡行为的不稳定吞没流。与 ws/h = 0 和 0.5（ws 和 h 是入口射流的错位度和高度）的反应器中的涡流合并振荡不同，在 ws/h = 1 的反应器中识别出 S 形自激振荡。非对齐 T 喷嘴反应器中的混合通过时间平均分离强度 (IOS) 进行量化，并揭示了混合机制。由于稳定吞没流的较早出现，在低 Re 下，非对齐 T 射流反应器中的混合显着增强。ws/h = 0 和 0.5 的反应器中的涡流合并振荡和 ws/h = 1 的反应器中的 S 形自激振荡都有助于混合增强。