COMPUTER-AIDED DESIGN OF TYPE C4: COMPRESSOR BLADE PROFILE

Abstract

The paper presents the results of designing a compressor blade profile of type C4 using CAD, which implements the method of nonlinear transformation. Girst transformation was used by the authors. All calculations and graphical representations were made in the computer algebra system Mathcad. For the calculation and graphical representation the centreline is approximated with three nonlinear segments in the form of second order Bezier curve. After determining the first and last point of the second order Bezier curve, the coordinates of the middle point on the intersection of tangential lines that start at the first and last point of the curve are determined. After the approximation of three sections with second order Bezier curves the integral function of the blade back (convex side of the contour) of the profile C4 considering the leading and trailing edges are made as arcs. According to the analytical formulas, the geometric parameters of the curved profile were calculated, which are necessary for calculating the strength of the compressor blade.

Keywords

• компрессор
• профиль С4
• решетка
• САПР
• нелинейные преобразования