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Correlation model for noise sources in turbulent jet based on birth of vortices as a key event

机译:基于旋涡产生为关键事件的湍流射流噪声源相关模型

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A new approach for modelling of noise sources in the turbulent jets is proposed. In this approach the first stage of turbulent pulsation cascade is supposed to be responsible for the noise generation. This stage includes the birth of the primary vortices due to jet flow instability and their evolution until disintegration. The birth of vortices accompanied by abrupt change of variables is just a key event that provides specific features of correlation model that is necessary to describe the process of sound radiation. The model is based on stochastic description of the process of birth of the primary vortices and deterministic description of their subsequent evolution. The proposed approach gives a new insight on the well-known correlation models based on empirical modelling of the noise source correlation functions. It is shown that the main difference between the models is related not only with multipole structure of the noise sources but also with different conceptions of the vortex dynamics implicitly adopted in the model. As an example of the proposed approach a correlation model is developed for the noise generated by the eigen-oscillations of the vortex rings in the jet. The jet noise spectrum predicted by the model is close to the measurement data for the turbulent jet with velocity 120 m/s.
机译:提出了一种湍流射流中噪声源建模的新方法。在这种方法中,湍流脉动级联的第一阶段被认为是造成噪声的原因。该阶段包括由于射流不稳定引起的初级涡旋的产生以及它们的演化直至解体。伴随着变量突然变化的涡流的诞生只是一个关键事件,它提供了描述声音辐射过程所必需的相关模型的特定功能。该模型基于对初级涡旋的诞生过程的随机描述以及对其后续演化的确定性描述。所提出的方法对基于噪声源相关函数的经验建模的众所周知的相关模型提供了新的见解。结果表明,模型之间的主要区别不仅与噪声源的多极结构有关,而且与模型中隐含采用的涡旋动力学的不同概念有关。作为所提出方法的示例,针对由射流中的涡流环的本征振荡产生的噪声建立了相关模型。该模型预测的射流噪声频谱接近于速度为120 m / s的湍流射流的测量数据。

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