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以某风扇/增压级为研究对象,利用NUMECA(Numerical Mechanics Application)软件,计算了设计点和非设计点的三维流场和性能,并给出了风扇/增压级的特性。研究了叶尖间隙对风扇/增压级流场和气动特性的影响,对比分析了叶尖间隙分别为设计间隙的0、0.25、0.5、1和1.5倍时的风扇/增压级的气动性能。研究表明,随着叶尖间隙的增加,风扇/增压级总效率、风扇增压比和风扇/增压级增压比都有所下降。综合考虑,风扇/增压级的最佳间隙应为0.5～1倍设计间隙。
Taking a fan / supercharger as the research object, the three-dimensional flow field and performance of the design point and the non-design point are calculated by NUMECA (Numerical Mechanics Application) software, and the characteristics of the fan / supercharging stage are given. The influence of tip clearance on flow field and aerodynamic characteristics of fan / supercharger was studied. The aerodynamic performance of fan / supercharger at tip clearance of 0, 0.25, 0.5, 1 and 1.5 times of design clearance . Research shows that as the tip clearance increases, the total fan / supercharger efficiency, fan pressure ratio and fan / supercharger pressure ratio decrease. Taken together, the best fan / supercharger clearance should be 0.5 to 1 times the design gap.