|
|
|
|
|
Koichiro Hirose, Koji Fukudome, Hiroya Mamori and Makoto Yamamoto
Ice crystal icing occurs in jet engine compressors, which can severely degrade jet engine performance. In this study, we developed an ice crystal trajectory simulation, considering the state changes of ice crystals with a forced convection model, indicat...
ver más
|
|
|
|
|
|
|
|
|
|
|
Thomas Carolus and Konrad Bamberger
This study targets determining impellers of impeller-only axial fans with an optimal hub-to-tip ratio for the highest achievable total-to-static efficiency. Differently from other studies, a holistic approach is chosen. Firstly, the complete class of the...
ver más
|
|
|
|
|
|
|
|
|
|
|
Felix Czwielong and Stefan Becker
A novel active turbulence grid of the Institute of Fluid Mechanics at FAU Erlangen-Nuremberg is introduced. The focus of this grid is not on basic investigations of fluid mechanics, as is usually the case with active turbulence grids, but the generation ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Philipp Dietrich and Marc Schneider
In applications, the acoustics of fans can differ significantly from the measurements of the standalone fan. This is due to disturbed inflow conditions, for example, caused by a heat exchanger upstream of an axial fan. Resolving the complex geometry and ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Matteo Dellacasagrande, Edward Canepa, Andrea Cattanei and Mehrdad Moradi
The present work reports an experimental study of the leakage flow in a low-speed fan ring. Existing 2D Particle Image Velocimetry (PIV) measurements taken in a meridional plane in front of the rotor gap have been further processed and analyzed by means ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Gábor Daku and János Vad
This paper presents a critical overview on worst-case design scenarios for which low-speed axial flow fans may exhibit an increased risk of blade resonance due to profile vortex shedding. To set up a design example, a circular-arc-cambered plate of 8% re...
ver más
|
|
|
|
|
|
|
|
|
|
|
Fredrik Marincowitz, Michael Owen, Jacques Muiyser and Peter Holkers
Ambient wind has a negative effect on mechanical forced-draft direct air-cooled steam condenser (ACC) fan volumetric performance, and increases dynamic fan blade loading. Investigating these effects directly using on-site measurement or numerical analysi...
ver más
|
|
|
|
|
|
|
|
|
|
|
Dipali Ghodake, Marlène Sanjosé, Stéphane Moreau and Manuel Henner
The effect of blade sweep has been studied numerically with the Lattice Boltzmann Method on a family of low-speed free-vortex axial fans with sweeps of ±45°. Good overall aerodynamic agreement is first demonstrated on all fans at the design condition, pa...
ver más
|
|
|
|
|
|
|
|
|
|
|
Yinhui Zhong, Yinong Li and Jun Li
Due to the fact that the noise caused by axial fan blades of vehicles is large, which seriously affects ride comfort, and there is no effective mathematical model to quantitatively study the contribution of the various parameters of the blades to the noi...
ver más
|
|
|
|
|
|
|
|
|
|
|
Edward Canepa, Andrea Cattanei, Mehrdad Moradi and Alessandro Nilberto
The present paper reports a 2D-PIV (particle image velocimetry) study of the effect of the operating point on the leakage flow in a low-speed ring fan. First, the flow pattern has been studied at 12 operating points covering the whole characteristic curv...
ver más
|
|
|
|
|
|
|
|
|
|
|
Emmanuel Benichou, Nicolas Binder, Yannick Bousquet and Xavier Carbonneau
This paper introduces a semi-analytical approach which enables one to deal with distorted inflow in axial fans or compressors. It is inspired by the classical parallel compressor (PC) theory but relies on a local flow-loading coefficient formalism. It is...
ver más
|
|
|
|
|
|
|
|
|
|
|
Edward Canepa, Andrea Cattanei and Fabio Mazzocut Zecchin
The effect of rotational speed and pressure rise on the leakage flow noise radiated by a low-speed axial fan, provided with rotating shroud, has been systematically investigated. The flow in the gap region has been studied by means of particle image velo...
ver más
|
|
|
|
|
|
|
|
|
|
|
Gino Angelini, Alessandro Corsini, Giovanni Delibra and Lorenzo Tieghi
Since the 1960s, turbomachinery design has mainly been based on similarity theory and empirical correlations derived from experimental data and manufacturing experience. Over the years, this knowledge was consolidated and summarized by parameters such as...
ver más
|
|
|
|
|
|
|
|
|
|
|
Irina Filimonikhina,Yuriy Nevdakha,Lubov Olijnichenko,Viktor Pukalov,Hanna Chornohlazova
Pág. 60 - 69
The paper reports determining and comparison of the quality of dynamic balancing of rotating parts in the assembly (impeller) by correction mass and applying passive auto-balancers using the axial fan VO 06-300-4 as an example. The impeller is balanced i...
ver más
|
|
|
|
|
|
|
|
|
|
|
Till Heinemann and Stefan Becker
In thermal power plants equipped with air-cooled condensers (ACCs), axial cooling fans operate under the influence of ambient flow fields. Under inlet cross-flow conditions, the resultant asymmetric flow field is known to introduce additional harmonic fo...
ver más
|
|
|
|
|
|
|
|
|
|
|
Esztella Balla, János Vad
Pág. 122 - 129
The paper presents wind tunnel experiments, supplemented with phased array microphone measurements, on 2D basic models of low-speed axial fan blade sections: a flat plate, a cambered plate, and a RAF6-E airfoil. It aims at documenting the establishment o...
ver más
|
|
|
|
|
|
|
|
|
|
|
Bence Tóth, János Vad
Pág. 152 - 158
Axial fans operate in large numbers, often in the close vicinity of humans, therefore reducing their noise is a primary concern. In this paper, beamforming is applied to get information about the location and strength of noise sources on the rotor. This ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Alessandro Corsini, Sara Feudo, Cecilia Tortora, Graziano Ullucci
Pág. 153 - 163
This work investigates the use of unconventional sensors to measure pressure modulation interpreted as pseudo sound in the near field on the casing of a fan in a view to detect rotating stall. Rotating stall is an aerodynamic issue with a frequency signa...
ver más
|
|
|
|
|
|
|
|
|
|
|
Tamás Kalmár-Nagy, Bendegúz Dezso Bak, Tamás Benedek, János Vad
Pág. 109 - 113
We describe a mechanical/acoustic study of a short-ducted axial flow fan. The purpose is to compare mechanical noise to that caused by flow phenomena.The eigenfrequencies of the fan are identified through measurement and finite element computations. The ...
ver más
|
|
|
|
|
|
|
|
|
|
|
Tamás Benedek, Péter Tóth
Pág. 37 - 46
This paper summarizes a case study example on the methodology used for phased array microphone measurements in a realistic acoustic environment. A ducted fan rotor is measured in an environment, where structure born noise and aerodynamically generated no...
ver más
|
|
|
|
|
|