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Aeroacoustic Characteristics of Model Jet Test Facility Flow Conditioners

机译:模型喷射试验设施流量调节器的空气声学特性

摘要

An experimental investigation of flow conditioning devices used to suppress internal rig noise in high speed, high temperature experimental jet facilities is discussed. The aerodynamic and acoustic characteristics of a number of devices including pressure loss and extraneous noise generation are measured. Both aerodynamic and acoustic characteristics are strongly dependent on the porosity of the flow conditioner and the closure ratio of the duct system. For unchoked flow conditioners, the pressure loss follows conventional incompressible flow models. However, for choked flow conditioners, a compressible flow model where the duct and flow conditioner system is modeled as a convergent-divergent nozzle can be used to estimate pressure loss. Choked flow conditioners generate significantly more noise than unchoked conditioners. In addition, flow conditioners with small hole diameters or sintered metal felt material generate less self-noise noise compared to flow conditioners with larger holes.
机译:讨论了用于抑制高速,高温实验射流设施中钻机内部噪声的流量调节装置的实验研究。测量了许多设备的空气动力学和声学特性,包括压力损失和外部噪声的产生。空气动力学和声学特性都强烈取决于流量调节器的孔隙率和管道系统的封闭率。对于未阻塞的流量调节器,压力损失遵循传统的不可压缩流量模型。但是,对于阻塞的流量调节器,可将管道和流量调节器系统建模为收敛-发散喷嘴的可压缩流量模型可用于估计压力损失。阻塞的流量调节器比未阻塞的调节器产生更多的噪声。此外,与具有较大孔的流动调节器相比,具有小孔直径的流动调节器或金属毡烧结材料产生的自噪声较小。

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