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首页> 外文会议>AIAA/3AF aircraft noise and emissions reduction symposium 2014 >Verification of Noise Forecast Capabilities for Application to Full-scale Supersonic-capable Jet Engine Development
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Verification of Noise Forecast Capabilities for Application to Full-scale Supersonic-capable Jet Engine Development

机译：验证噪声预测能力在全尺寸超音速喷气发动机开发中的应用

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摘要

Jet noise theory has been developed and validated based on controlled laboratory scale measurements with considerable success. However, few full-scale jet engine noise studies have been conducted. The analytic methods of Tarn and Viswanathan were applied to full-scale high-performance aircraft flight noise measurements. These measurements were recorded to produce reference spectra for the U.S. Department of Defense community noise prediction model. The aircraft noise measurement's atmospheric conditions at the flight altitude were estimated using meteorological ground heating methods. Ambient conditions and engine speed were used to calculate jet noise parameters using substantiated engine thermodynamic cycle models. Fluid-dynamic measures of exhaust jet velocity, V_(j), diameter, Dj, and temperature ratio, T_t/T_a, were used to determine variation of OverAll Sound Pressure Levels (OASPLs). Flight-measured noise data compare well to the relations developed by Viswanathan and Tarn, but did not collapse as anticipated. Previous studies of jet noise propagation have shown that non-spherical spreading loss occurs in the measurements under study. Both non-spherical losses and scaling of OASPL to account for propagation range and jet diameter improve collapse. This favorable result substantially verifies the methodology of this study, leaving some concerns about scaling rules.
机译：基于受控实验室规模的测量，喷气噪声理论得到了发展和验证，取得了巨大的成功。但是，很少进行全尺寸喷气发动机噪声研究。塔恩和维斯瓦纳森的分析方法被应用于全面的高性能飞机飞行噪声测量。记录这些测量结果以产生美国国防部社区噪声预测模型的参考光谱。使用气象地面加热方法估算了飞行高度处飞机噪声的大气条件。使用确定的发动机热力学循环模型，使用环境条件和发动机转速来计算喷射噪声参数。排气射流速度V_（j），直径Dj和温度比T_t / T_a的流体动力学测量用于确定总体声压级（OASPL）的变化。飞行测量的噪声数据与Viswanathan和Tarn建立的关系比较好，但没有像预期的那样崩溃。先前对喷气噪声传播的研究表明，在所研究的测量中会发生非球形扩展损失。 OASPL的非球形损耗和缩放比例都可以解决传播距离和射流直径的问题，从而可以改善崩溃效果。这个良好的结果从本质上验证了本研究的方法论，而对定标规则仍然存在一些担忧。

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