Gemeinsame physikalische Grundlagen der Axial- und Radialkompressoren

Eckert, Bruno; Schnell, Erwin

doi:10.1007/978-3-642-80543-1_4

Cited by 1 publication

(3 citation statements)

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“…Basically, the result of the design solver, as indicated in Fig. 4, is the camber line, and by attributing some thickness around it, a blade and an airfoil, Eckert [18] profile is obtained. The thickness distribution is again an important design choice and one has to carefully weigh if profiling really pays.…”

Section: Further Design Assumptions Based On the Profile Theorymentioning

confidence: 99%

“…5 Flow over a profile cascade Fig. 6 Performance curves for a constant thickness blade and an airfoil, Eckert [18] profile is obtained. The thickness distribution is again an important design choice and one has to carefully weigh if profiling really pays.…”

Section: Further Design Assumptions Based On the Profile Theorymentioning

confidence: 99%

“…However, such methods were originally proposed for axial flow water turbines where the operating regime requires high pressures. For axial fans, where the pressures are in the range of thousands of Pascals, a variable thickness along the camber is unnecessary since, according to Eckert [18], when measuring two impellers, one with aerofoil profiles and the other one with constant thickness, their performance is identical, as shown in Fig. 6.…”

Section: Further Design Assumptions Based On the Profile Theorymentioning

confidence: 99%

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Analytical and numerical investigation of the optimum pressure distribution along a low-pressure axial fan blade

Pascu

Miclea

Epple

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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Abstract:In the field of axial flow turbomachines, the two-dimensional cascade model is often used experimentally or numerically to investigate fundamental flow characteristics and overall performance of the impeller. The core of the present work is a design method for axial fan cascades aiming to derive inversely the optimum blade shape based on the requirements of the impeller and not using any predefined aerofoil profiles.While most design strategies based on the aerofoil theory assume constant total pressure at all streamlines, i.e. free-vortex flow, this paper investigates the possibility of varying the total pressure along the blade and based on that, an analytical expression of the outlet blade angle is determined. When computing the blade profile at a specified radius, critical parameters reflecting on the flow characteristics are observed and adjusted (i.e. sufficient lift and controlled deceleration of the flow on the contour) so that the resulting profile is derived for minimum losses.The validation of this design strategy is given by the numerical results obtained when employed as an optimization tool for an industrial fan: 10-20 per cent absolute increase in the static efficiency of the optimized impeller.

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Section: Further Design Assumptions Based On the Profile Theorymentioning

confidence: 99%

Section: Further Design Assumptions Based On the Profile Theorymentioning

confidence: 99%

Section: Further Design Assumptions Based On the Profile Theorymentioning

confidence: 99%

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