Multiple engineering and acoustic studies confirm that flame trenches and their integrated deflectors successfully redirect high-velocity rocket exhaust and mitigate intense acoustic and thermal loads during lift-off.
The claim states that a flame trench deflects rocket exhaust and acoustic energy during launch. Papers [0], [1], and [6] analyze the deflection of rocket exhaust plumes by flame deflectors. Papers [2], [3], and [9] directly address how flame trenches and deflectors interact with and redirect acoustic energy and noise generated during lift-off. Thus, the evidence thoroughly supports the claim.