尾涡数值模拟的曲涡元技术

连接涡线端点形成涡段并计算其对空间任意点的影响系数是尾迹分析的基本环节,称为涡元技术。本文推出圆弧涡元与其应用程序,并引进抛物拱弧涡元,以代替传统的直涡元。提供的曲涡元程序可方便地用于尾迹分析,算例表明曲涡元在提高精度减少计算量方面的先进性。

CURVED VORTEX ELEMENTS FOR NUMERICAL WAKE MODELING

Connecting two vortex end points to form a vortex segment and evaluating its contribution to the induced velocity at an arbitraty point is the key element in wake numerical analysis. The conventional straight line vortex element (SLVE) is unable to produce high accuracy evaluation in the case of complex wake structure, such as helicopter rotor wake, where a substitution for the SLVE is essentially needed. This paper covers the derivation and development of CVEC (Curved Vortex Element on Circular arcs) and CVEP (Curved Vortex Element on Parabolic arcs) and conscientiously prepared numerical tests to show their high accuracy and efficiency. Both CVEC and CVEP are recommended for use in advanced wake modeling.