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References in periodicals archive ?
It is noted that in practice the term of blade pitch angle is usually referred to as [theta] at the hub section of the blade, but in this paper [theta] at the mid-blade height is used as the blade pitch angle in order to determine the shaft power matching.
After the blade pitch angle shown in Figure 2 is determined and the deviation angle is obtained from Figure 10, the distribution of [[beta].sub.2F] and [[beta].sub.2R] can be calculated from Equation 1.
In order to further discuss the effects of k, the approximate optimum blade pitch angle [[theta].sub.R] can also be calculated using the guideline for k = 1.6, 1.7, 1.77, 1.9, and 2.0.
The authors analyzed the work done by two impellers of CRAFF using the method of velocity triangle and discovered that there exists a shaft power matching coefficient k, a tangent ratio of the relative outflow angles of two impellers, which not only determines the overloading of the rear impeller but also directly affects the flow rate and shaft power at design operation, the operation range of flow rate, and the blade pitch angle of the rear impeller.
Finally a guideline of shaft power matching for determining the approximate optimum of blade pitch angle of the two impellers is presented and applied to six different model fans for the same series of CRAFF.
Effect of k on the Approximate Optimum of Blade Pitch Angle of Rear Impeller ([degrees]) Fan A Fan B Fan C Fan D Fan E Fan F [[theta].sub.RC] (CFD) 19.5 24.5 18.5 21.5 20.8 23.3 [[theta].sub.RG] (k = 1.6) 22.0 28.6 18.5 24.2 20.7 26.9 [DELTA][[theta].sub.R] (k = 2.5 4.1 0.0 3.2 -0.1 3.6 1.6) [[theta].sub.RG] (k = 1.7) 20.9 27.2 17.5 23.0 19.6 25.6 [DELTA][[theta].sub.R] (k = 1.4 2.7 -1.0 1.5 -1.2 2.3 1.7) [[theta].sub.RG] (k = 1.77) 20.2 26.3 16.9 22.2 18.9 24.7 [DELTA][[theta].sub.R] (k = 0.7 1.8 -1.6 0.7 -1.9 1.4 1.77) [[theta].sub.RG] (k = 1.9) 18.9 24.8 15.9 20.9 17.8 23.3 [DELTA][[theta].sub.R] (k = -0.6 0.3 -2.6 -0.6 -3.0 0.0 1.9) [[theta].sub.RG] (k = 2.0) 18.1 23.7 15.2 20.0 17.0 22.3 [DELTA][[theta].sub.R] (k = -1.4 -0.8 -3.3 -1.5 -3.8 -1.0 2.0)
In order to determine the approximate optimum of blade pitch angles of two impellers, a guideline for shaft power matching is then presented.
* In order to reduce cost, all different-sized fans in the same series have only one set of blueprints, and blade profiles are scaled up or down, but the blade pitch angles are varied to match the rated power of motors.
Therefore, it is still of practical significance to come up with an effective guideline for shaft power matching, with which the optimum combination of blade pitch angles can be achieved easily and quickly.
But when the blade shape and rotating speed are determined, the magnitude of the shaft powers at different flow rates is only dependent on the blade pitch angles of the two impellers.
The blade pitch angles of the front and the aft propellers are both set as [[beta].sub.70] = 45.3[degrees].