The Khokhlovâ??Zabolotskayaâ??Kuznetsov (KZK) equation has been widely used in the simulation and calculation of nonlinear sound fields.\nHowever, the accuracy of KZK equation reduced due to the deflection of the direction of the sound beam when the sound beam is inclined\nincidence. In this paper, an equivalent sound source model is proposed to make the calculation direction of KZK calculation model\nconsistent with the sound propagation direction after acoustic refraction, so as to improve the accuracy of sound field calculation under the\ninclined incident conditions. The theoretical research and pool experiment verify the feasibility and effectiveness of the proposed method.
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