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The design of high-efficiency fans is often based on the experience of the designer. In order to determine its main dimensions, fan designers use the Cordier diagram. For a given operating point (i.e. flowrate and pressure, and a rotating speed), the optimum diameter of highefficiency fans can be found in the Cordier diagram. The Cordier diagram is an empirical diagram based on measurements.

Cordier diagram can be used to determine specific speed and impeller tip diameter . Accordingly solidity ratio and hub-tip ratio (range 0.3-0.7) can be adjusted. Solidity ratio …

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The correlations used for obtaining the Cordier diagram are often not fit for the low Reynolds number and large-gap machines. Therefore, one major weakness in the application of this low-order model to the blade geometry of the blood pumps is that the detailed flow features cannot be properly accounted for.

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For axial, radial and mixed flow fans, a single relationship (CORDIER-diagram) exists and it is well accepted that this line represents "optimum" fan designs with high efficiency. The paper provides a theoretical interpretation of the CORDIER-lines for squirrel-cage and cross-flow fans, since they differ considerably from the classical ...

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The Cordier diagram is an empirical diagram based on measurements. It delivers a relation between flowrate, pressure, rotating speed, and diameter. However, the Cordier diagram does not provide any information on the blade shape (i.e. the angles and the blade width). In order to fill this gap, there are design rules based on the experience of ...

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