Characteristic curves of centrifugal pumps are their head, kW (bhp), NPSHR and iso-efficiency curves plotted against capacity for a given rpm. They are extremely important in the pump selection process. Head/capacity curves come in several forms: a single curve that might represent the maximum ...
Despite the considerable efforts that have been devoted to the study of head-flow curve instability in single-stage centrifugal pumps with volute casing, the cause of such phenomenon is not sufficiently understood. In this study, we investigated the variation of hydraulic losses based on the......
Downsizing and improvement of efficiency in a centrifugal pump have been required still now. It is well known that the flow instability such as a positive slope in Q-H curve, rotating stall often may appear in case of the above advanced design. Though a lot of studies of flow instability ...
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Fig. 3 shows the effect of the type of tube surface on evaporator performance during the boiling of R-141b refrigerant on the tube bundle with a 1.7d pitch. In this figure, the boiling curve for the porous coated evaporator tubes shifts to the left towards lower superheats. The phenomenon...
The load–displacement curve when n = 2. Full size image Fig. 6 The load–displacement curve when n = 3. Full size image Fig. 7 The load–displacement curve when n = 6. Full size image Fig. 8 The load–displacement curve when n = 9. Full size image Fig. 9 The...
The difference of the head curve between the experiment and numerical simulation under the optimal operating condition and large flow rate condition was relatively small with differences of less than 4 %. However, Conclusions In this study, a pump-turbine model of a certain power plant was taken...
curve of a small axial flow pump in reverse power generation operation and noted that the axial flow pump can be used as a turbine to reverse power generation in a low-head Pico hydropower plant. Qian et al.10studied two pump and turbine modes for a small axial flow pump and found that...
curve of the mechanism can be obtained as follows. as shown in figure 2 , in the initial workspace, the natural frequencies of each order presented an obvious symmetry with the position change, and that for the first-order natural frequency was the most evident, corresponding to the movement ...
In the process of bionic airfoil design, the selection of bionic objects and data acquisition are only the preliminary basic steps, and the key step is the curve fitting based on known data. Typical airfoil parameterization methods mainly include the Hicks–Henne shape function method with strong ...