To satisfy the need for high-precision wind tunnel testing, research on flow quality measurement technique of compressible fluid in a subsonic wind tunnel is carried out. On the premise of one-dimensional is entropic flow, the modes of disturbance included in the freestream of the wind tunnel are analyzed. The method for solving modes of disturbance and acoustic and vorticity modes components of flow variables is derived theoretically, and its relationship with mass flow fluctuation, total temperature fluctuation and their cross-correlation as known quantities is established. Flow quality measurement experiments are conducted with Mach number varying from 0.3 to 0.7. Modes of disturbance and acoustic and vorticity modes components of flow variables are solved using the established method, and the variation rule of the results with Mach number is analyzed. The uncertainty of modes of disturbance and acoustic and vorticity modes components of flow variables is obtained using Monte Carlo simulation and uncertainty transfer formula. Uncertainty accounts for about 1% of the corresponding variable and most results are only on the order of 0.1%, exhibiting high accuracy of the flow quality measurement test results. The results validate the feasibility of the established method for analysis of modes of disturbances in compressible fluid in the subsonic wind tunnel.
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