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发表于 2025-3-30 10:38:24
Appendices,Table 17.1 provides the properties of saturated water. They are rounded. In the liquid phase the properties depend little on pressure. The values from the table can therefore be used approximately also for pressures higher than the saturation pressure: at a pressure of 1000 bar the water density is about 4–5 % higher than the saturation pressure.
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发表于 2025-3-30 13:00:41
Fluid Dynamic Principles,d on a few basic physical laws only. In this chapter these will be briefly reviewed and their general nature illuminated. Emphasis will be on the phenomena which are of special interest and significance to the pump engineer. Basic knowledge of the terms of fluid dynamics is taken for granted.
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发表于 2025-3-30 20:01:27
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发表于 2025-3-30 22:19:20
Performance Characteristics, Overload corresponds to q* > 1, while operation at q* < 1 is called “partload”. The pump characteristics describe the behavior of head, power consumption and efficiency as functions of the flow rate (the behavior of NPSH=f(Q) is discussed in Chap. 6). The shape of these performance curves over the
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发表于 2025-3-31 01:18:45
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发表于 2025-3-31 05:19:13
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发表于 2025-3-31 11:56:29
Design of the Hydraulic Components, such as described in this chapter. The first design created that way is then subject to analysis and optimization by CFD. Even then the accuracy of performance prediction is not always satisfactory. This, because the 3D-flow through the pump depends on the complex shapes of the flow paths given by
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发表于 2025-3-31 16:34:19
Numerical Flow Calculations,into a multitude of small cells, these equations can be solved in an . by numerical methods. Because of their wide range of application, numerical flow calculations (“computational fluid dynamics” or “CFD” for short) have become a special discipline of fluid dynamics.