Numerical investigation on the generation, mixing and convection of entropic and compositional waves in a flow duct
Numerical investigation on the generation, mixing and convection of entropic and compositional waves in a flow duct
复制标题
流道中熵波和组合波的产生、混合和对流的数值研究
DOI：
10.1016/j.jsv.2019.115155
复制
发表时间：
2020
影响因子：
4.7
通讯作者：
S. Hochgreb
中科院分区：
文献类型：
--
作者：
J. Rodrigues;Andrea Busseti;S. Hochgreb
最近的模型和实验表明，间接噪声可以通过加速通过喷嘴的熵或成分扰动产生。这些研究发现，声学签名取决于对流过程中扰动波的色散效应的程度。在这项工作中，数值模拟进行使用的URANS公式来模拟非定常熵和成分波的混合在一个开放的流动管道中的过渡制度（2500 <Re< 8100）。通过加热或径向注入比空气重（氩）或轻（氦）的惰性气体来扰动流动。计算的温度和质量分数场进行比较，使用侵入式和非侵入式技术获得的实验结果。与实验数据吻合良好。两个扰动的签名，以及捕获使用两个方程湍流模型。然而，它们落后于下游探头位置的实验结果，表明中心线速度被低估。色散对成分波的影响是微不足道的系统研究这里。在热添加的情况下，热损失被发现是一个关键因素，在捕捉正确的熵扰动长对流长度。
Recent models and experiments have demonstrated that indirect noise can be generated via acceleration of either entropic or compositional perturbations through a nozzle. These studies found that the acoustic signature depends on the extent of the dispersion effects on the perturbation waves during the convection process. In this work, numerical simulations are undertaken using the URANS formulation to model the mixing of unsteady entropic and compositional waves in an open-ended flow duct in the transitional regime (2500 <Re< 8100). The flow is perturbed by either heat addition or radial injection of an inert gas that is heavier (argon) or lighter (helium) than air. The computed temperature and mass fraction fields are compared to experimental results obtained using both intrusive and non-intrusive techniques. Agreement with the experimental data is good. The signatures of both perturbations are well captured using two-equation turbulence models. However, they lag behind the experimental results at downstream probe locations, suggesting that the centreline velocity is underpredicted. Dispersion effects on the compositional waves are shown to be insignificant for the system studied here. In the heat addition case, heat loss is found to be a key factor in capturing the correct entropic perturbation for long convection lengths.
检测管道中合成热点产生的直接和间接噪声
DOI：
10.17863/cam.8524
发表时间：
2017
期刊：
--
影响因子：
--
作者：
De Domenico F
通讯作者：
De Domenico F