Abstract
In this paper, a piezoelectric-sensor-based free-field shock-wave test method for measuring the muzzle overpressure of a meteorological air is proposed. The test system is described, and the measurement-point layout is introduced. Experimental verification of the results from Autodyn numerical simulations based on the Sadowski formula was conducted, and the distributions of pressure, density, and velocity of the muzzle flow field were simulated as references for the free-field shock-wave pressure for the actual tests. The experimental results from different models of air cannons demonstrate that the proposed method can accurately measure the peak of the free-field shock-wave overpressure. Considering the location of each sensor and the time interval between the shock-wave overpressure peak reaching adjacent test points, the propagation speed can be obtained, and the muzzle-pressure propagation law can be established. This work has certain guiding significance for the development and design of meteorological air cannons.
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