In the thesis, the design method of the diagonal flow fan impeller has detailedly researched different from the previous means borrowing and extending design methods for axial flow or centrifugal type, a complete design method has presented on the basis of quasi-three dimensional design idea . the course is mainly composed of such steps as meridional surface design, inverse problem computation in meridional surface, blade shaping on stream surface, and verifying through three dimensional computation, until the design requirement is met at last 不同于以往的軸流式或離心式延長設(shè)計(jì)方法或經(jīng)驗(yàn)方法,本文按照準(zhǔn)三元設(shè)計(jì)的思路給出了一套完整的設(shè)計(jì)方法,即子午面設(shè)計(jì)?子午面反問題計(jì)算?斜流流面上葉片造型?三維計(jì)算驗(yàn)證優(yōu)化,直至符合設(shè)計(jì)目標(biāo)。