In the acoustic fatigue experiment for hypersonic vehicle in simulated harsh service environment on
ground, acoustic loads on the surface of test pieces of the vehicle need to be measured. However, for
the normal microphones without high temperature resistance ability, the near field sound measurement
cannot be achieved. In this work, on the basis of previous researches, an acoustic tubes array is designed
to achieve the near field measurement of acoustic loads on the surface of the test piece in the supersonic
airflow with high temperature achieved by coherent jet oxygen lance. Firstly, the process of designing
this acoustic tubes array is introduced. Secondly, the equality of phase differences at the front and at
the end of the tubes is stated and proved using a phase differences test with an acoustic tubes array
whose design is presented in this text; therefore, the phase differences of signals acquired by microphones
can be directly applied to beamforming algorithm to determine the acoustic load source. Finally, using
above mentioned acoustic tubes array, measurement of acoustic load, with and without a test piece in the
supersonic airflow made by the coherent jet oxygen lance, is conducted respectively, and the measurements
results are analyzed.
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