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当设计透平时,轴流式透平进口处子午面通道形式的选择具有很大的意义。通道的形状确定了透平的尺寸和它的经济性。当轴向尺寸受到严格限制时,这种选择较复杂。这时通流部份的急剧扩张既要依靠级间的过渡扩压器,又要依靠导叶来实现。子午面扩张对透平级内损失的影响相当大。在旋转模型的试验研究中获得有关损失的最可靠的定量数据,而研究叶栅时,得到的只是定性的比较结果,因为子午面扩张的导向叶栅中的损失仅是级损失中的一部份。大多数研究是对工作于汽轮机低压缸中的叶栅和级的模型进行的。
When designing a turbine, the choice of the meridian channel at the axial turbine inlet is of great significance. The shape of the passage determines the size of the turbine and its economy. This choice is complicated when the axial dimension is severely limited. At this moment, the rapid expansion of the flow-through part depends on the inter-stage transitional diffuser and the guide vane. The meridional expansion has a considerable impact on the loss within the turbine. The most reliable quantitative data on losses are obtained in the experimental study of the rotating model and the study of cascades yields only qualitative comparisons as the loss in the guide cascades of meridional expansion is only one of the stage losses Copies Most studies have conducted on models of cascades and stages working in low pressure cylinders of steam turbines.