Flaperon Modification Effect on Jet-Flap Interaction Noise Reduction for Chevron Nozzles
Flaperon Modification Effect on Jet-Flap Interaction Noise Reduction for Chevron Nozzles
复制标题
襟翼改进对人字形喷嘴射流襟翼相互作用降噪的影响
DOI：
10.2514/6.2007-3666
复制
发表时间：
2007
期刊：
影响因子：
2.5
通讯作者：
Russell H. Thomas
中科院分区：
文献类型：
--
作者：
V. Mengle;R. Stoker;L. Brusniak;Ronen Elkoby;Russell H. Thomas
当襟翼浸没在发动机推进气流中或处于其卷吸区域时，如翼下发动机布局的进场条件下，喷气襟翼干扰（JFI）噪声可成为远场噪声的重要组成部分。本文用缩比模型在自由喷流条件下，对襟翼（内侧襟翼和外侧襟翼之间的高速副翼）的改型效果进行了实验研究。襟副翼的改型有两种：双后缘和微型涡流发生器。这两个概念的参数变化进行了测试与一个圆形的同轴喷嘴和先进的人字形喷嘴，与方位角变化的风扇人字形，使用远场麦克风阵列和相控麦克风阵列源诊断的目的。一般来说，相控阵结果证实了远场噪声源的变化，在上游象限指向JFI的襟副翼后缘附近的远场结果。特殊的后缘与圆形喷管相结合，使进场时JFI噪声略有降低，而平行同向旋转的小型垂直起落飞机在更宽的角度范围内更有益处，但这两种方案在起飞条件下噪声更大。这两种方案在进近和起飞条件下与先进的人字形喷管一起使用时，一般都有不利的JFI效应。
Jet-flap interaction (JFI) noise can become an important component of far field noise when a flap is immersed in the engine propulsive stream or is in its entrained region, as in approach conditions for under-the-wing engine configurations. We experimentally study the effect of modifying the flaperon, which is a high speed aileron between the inboard and the outboard flaps, at both approach and take-off conditions using scaled models in a free jet. The flaperon modifications are of two types: sawtooth trailing edge and mini vortex generators (vg's). Parametric variations of these two concepts are tested with a round coaxial nozzle and an advanced chevron nozzle, with azimuthally varying fan chevrons, using both far field microphone arrays and phased microphone arrays for source diagnostics purposes. In general, the phased array results corroborate the far field results in the upstream quadrant pointing to JFI near the flaperon trailing edge as the origin of the far field noise changes. Specific sawtooth trailing edges in conjunction with the round nozzle give marginal reduction in JFI noise at approach, and parallel co-rotating mini-vg's are somewhat more beneficial over a wider range of angles, but both concepts are noisier at take-off conditions. These two concepts have generally an adverse JFI effect when used in conjunction with the advanced chevron nozzle at both approach and take-off conditions.