1.概论 1.1 轴流鼓风机的压力-流量特性与内部流动的关系在叙述本试验结果之前,打算先谈谈轴流机械特性与叶轮内部流动之间的关系。实际上,叶轮的内部流动是十分复杂的非恒定三元流动,按惯例假定流动是圆周方向的平均值,亦即为轴对称的子午面流动。叶轮各叶片在无失速的流量条件下,可以比较容易地计算子午面流动,鼓风机性能也能相当正确地推算。如果是轮毂与外壳同旋转轴平行的鼓风机,那么古典的单纯半径平衡条件式或作动器盘理论比较适用;在与旋转轴相倾斜的情况下,最近流行的流线法或矩阵法等数值计算法比较 1. Introduction 1.1 Relationship between pressure-flow characteristics of an axial blower and internal flow Prior to describing the results of this test, it is intended to first talk about the relationship between the mechanical properties of an axial flow and the flow inside the impeller. In fact, the internal flow of the impeller is a very complex and unsteady ternary flow. It is conventionally assumed that the flow is the average value in the circumferential direction, that is, the axisymmetric meridional flow. The impeller blades can calculate the meridional flow relatively easily without stalling flow rate, and the blower performance can also be calculated fairly correctly. In the case of a blower with a hub and a housing parallel to the axis of rotation, the classic purely radial equilibrium condition or actuator disk theory is suitable; in the case of tilting with the rotating shaft, the recent popular streamline or matrix methods Comparison of calculation methods