Experimental and numerical investigation of a gearless one-motor contra-rotating fan

Heinrich, Martin; Friebe, Christian; Schwarze, Rüdiger

doi:10.1177/0957650916633014

Cited by 9 publications

(10 citation statements)

References 10 publications

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“…A given technical problem of axial fans is the emergence of unavoidable swirl in the wake flow with high peripheral speeds. While contra-rotating axial fans already reduce the swirl in the wake flow [51], detecting angular momentum in real-time using our flow sensor platform could possibly further reduce mechanically unfavourable flow dynamics in the wake.…”

Section: Resultsmentioning

confidence: 99%

Bidirectional biomimetic flow sensing with antiparallel and curved artificial hair sensors

Abels¹,

Qualtieri²,

Lober³

et al. 2019

Beilstein J. Nanotechnol.

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Background: Flow stimuli in the natural world are varied and contain a wide variety of directional information. Nature has developed morphological polarity and bidirectional arrangements for flow sensing to filter the incoming stimuli. Inspired by the neuromasts found in the lateral line of fish, we present a novel flow sensor design based on two curved cantilevers with bending orientation antiparallel to each other. Antiparallel cantilever pairs were designed, fabricated and compared to a single cantilever based hair sensor in terms of sensitivity to temperature changes and their response to changes in relative air flow direction. Results: In bidirectional air flow, antiparallel cantilever pairs exhibit an axially symmetrical sensitivity between 40 μV/(m s−1) for the lower air flow velocity range (between ±10–20 m s−1) and 80 μV/(m s−1) for a higher air flow velocity range (between ±20–32 m s−1). The antiparallel cantilever design improves directional sensitivity and provides a sinusoidal response to flow angle. In forward flow, the single sensor reaches its saturation limitation, flattening at 67% of the ideal sinusoidal curve which is earlier than the antiparallel cantilevers at 75%. The antiparallel artificial hair sensor better compensates for temperature changes than the single sensor. Conclusion: This work demonstrated the successive improvement of the bidirectional sensitivity, that is, improved temperature compensation, decreased noise generation and symmetrical response behaviour. In the antiparallel configuration, one of the two cantilevers always extends out into the free stream flow, remaining sensitive to directional flow and preserving a sensitivity to further flow stimuli.

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Section: Resultsmentioning

confidence: 99%

Bidirectional biomimetic flow sensing with antiparallel and curved artificial hair sensors

Abels¹,

Qualtieri²,

Lober³

et al. 2019

Beilstein J. Nanotechnol.

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“…Development of high-performance turbomachinery is always an important orientation in the field of aeroengines. Thanks to unique advantages in structural and aerodynamic aspects, the contrarotating fan (CRF) technology is deemed as an important technology which can break through development limits in traditional rotor-stator blade row compressors and has drawn close attention from lots of scholars at present [1][2][3]. Basic ideas of the contrarotating fan technology are as follows: the stator component is canceled and the contrarotation of rotor is used to increase the power capability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Speed Matching Affecting Contrarotating Fan’s Performance Using Wireless Sensor Network including Big Data and Numerical Simulation

et al. 2018

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This paper describes the investigations performed to better understand two-stage rotor speed matching in a contrarotating fan. In addition, this study develops a comprehensive measuring and communication system for a contrarotating fan using ZigBee network. The investigation method is based on three-dimensional RANS simulations; the RANS equations are solved by the numerical method in conjunction with a SST turbulence model. A wireless measurement system using big data method is first designed, and then a comparison is done with experimental measurements to outline the capacity of the numerical method. The results show that when contrarotating fan worked under designed speed, performance of two-stages rotors could not be matched as the designed working condition was deviated. Rotor 1 had huge influences on flow rate characteristics of a contrarotating fan. Rotor 2 was influenced by flow rates significantly. Under large flow rate condition, the power capability of rotor 2 became very weak; under working small flow rate condition, overloading would take place to class II motor. In order to solve the performance mismatch between two stages of CRF under nondesigned working conditions, under small flow rate condition, the priority shall be given to increase of the speed of rotor 1, while the speed of rotor 2 shall be reduced appropriately; under large flow rate condition, the speed of rotor 1 shall be reduced and the speed of rotor 2 shall be increased at the same time.

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“…The resulting package size is large compared to a single stage fan with guide vanes but similar when a motor concept is available with the motors internal rotor connected to one fan stage and the external rotor connected to the other. The motor concept of Heinrich et al 4 therefore offers the possibility of offering the inherently more efficient counter-rotating fan configuration in the same package size as a single stage fan with guide vanes.…”

mentioning

confidence: 99%

“…Heinrich et al. 4 conducted an experimental and numerical investigation of a gearless one-motor contra-rotating fan. Traditionally counter-rotating fans have been used in applications requiring a higher design pressure ratio than can be achieved in a single stage fan.…”

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confidence: 99%

See 1 more Smart Citation

Editorial for Special Issue on Air Movement Fan Technology

Sheard

2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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Experimental and numerical investigation of a gearless one-motor contra-rotating fan

Cited by 9 publications

References 10 publications

Bidirectional biomimetic flow sensing with antiparallel and curved artificial hair sensors

Bidirectional biomimetic flow sensing with antiparallel and curved artificial hair sensors

Investigation of Speed Matching Affecting Contrarotating Fan’s Performance Using Wireless Sensor Network including Big Data and Numerical Simulation

Editorial for Special Issue on Air Movement Fan Technology

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