Experiments have characterized the acoustics of axisymmetric high-speed jets at a variety of Mach numbers and velocities and at pressure-matched, overexpanded, and underexpanded conditions. The effect of an annular secondary flow on noise emission was also investigated. The fully expanded jet velocity ranged from 630 to 920m/s and the fully expanded jet Mach number ranged from 1.27 to 1.75. The secondary flow was supplied at 400 m/s and was designed for Mach wave elimination conditions.
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机译：实验已经表征了在各种马赫数和速度以及压力匹配，过度膨胀和膨胀不足条件下轴对称高速射流的声学特性。还研究了环形二次流对噪声发射的影响。完全膨胀的射流速度范围为630至920m / s，完全膨胀的射流马赫数范围为1.27至1.75。二次流的供应速度为400 m / s，设计用于消除马赫波的条件。
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