TURBULENCE MODELING IMPROVEMENTS FOR JET NOISE PREDICTION USING PIV DATASETS
TURBULENCE MODELING IMPROVEMENTS FOR JET NOISE PREDICTION USING PIV DATASETS
复制标题
使用 PIV 数据集改进喷射噪声预测的湍流模型
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
D. Kenzakowski
中科院分区：
文献类型：
--
作者：
D. Kenzakowski
基于与发展中喷流区已有的PIV数据的定量比较，讨论了湍流模型的修正，以改进用于喷流噪声预测的流场模拟。过去的喷流模型验证主要依赖于与平均速度中心线衰减率的比较和自相似区域中可用的实验径向测量，该区域位于喷流噪声产生区的下游。这些过去的建模工作对上游预测的湍流行为的影响现在得到了评估，并表明需要进行修订。此外，还强调了喷嘴出口流型对该区域内射流混合模拟的关键作用。对基本k-e模型的拟议修改在自由剪切数据集上得到验证，解决了发展中的射流混合问题，并提供了良好的数据一致性，而无需对亚音速射流的热范围进行进一步修改。在冷热超音速喷流预报中观察到的混合异常现象归因于湍流动能方程的可压缩性修正项的模式缺陷；讨论了一个初步验证的经验修正，得到了令人满意的结果。
Turbulence model modifications toward improving flowfield simulations for jet noise prediction are discussed based on quantitative comparisons with available PIV data in the developing jet region. Past jet modeling validation has relied primarily on comparisons with mean velocity centerline decay rate and experimental radial measurements available in the self-similar region, well downstream of the jet noise-producing region. Impact of these past modeling efforts on the predicted turbulence behavior upstream is now assessed and indicates need for revisions. Additionally, the critical role of the nozzle exit flow profile on the jet mixing simulation within this region is highlighted. Proposed modifications to a basic k-e model, validated across free shear datasets, address developing jet mixing issues and provide excellent data agreement without further modification for a thermal range of subsonic jets. Mixing anomalies still observed between hot and cold supersonic jet predictions are attributed to model deficiencies in the compressibility correction term of the turbulent kinetic energy equation; an empirical correction with preliminary validation is discussed with promising results.