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三角形截面导弹气动性能的研究主要依靠实验，理论研究尚显不足。该文构造了一种从圆柱绕流到三角形绕流的近似解析变换，给出了复势、复速度、压力系数的表达式与典型算例。这种变换可便捷地给出三角形绕流的流动图谱、流速分布以及压力系数分布。其结果对认识三角形绕流以及其他非圆截面气动性能的研究具有重要意义。
The research on the aerodynamic performance of triangular cross-section missiles relies mainly on experiments, and theoretical studies are still inadequate. In this paper, an approximate analytic transformation of a circular flow around a cylinder to a triangular flow is constructed. The expressions of complex potential, complex velocity and pressure coefficient and typical examples are given. This transformation gives a quick and easy flow chart of the flow around the triangle, the flow velocity distribution and the pressure coefficient distribution. The results are of great significance for the study of the flow around the triangle and the aerodynamic performance of other noncircular sections.