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SOFT_2011
By admin at 2 January, 2011, 11:50 pm
FANBPF is a software package devoted to fan/ventilator designers and acousticians enabling them to optimise the fan geometry at the draft stage in the view of reducing pressure pulsation and the associated vibration without large experimental expenses. The code employs numerical techniques for prediction of pressure fluctuations in the working cavity of a centrifugal fan. [...]
Read More >>NUMERICAL AND EXPERIMENTAL STUDY OF 3D UNSTEADY FLOW IN A LAWN MOWER FOR PREDICTION OF PRESSURE PULSATION AND NOISE
By admin at 4 February, 2010, 4:42 pm
Michael BOCKHOFF1, Karine MONES1, Serguei TIMOUCHEV2, Kirill ILHICOV2, Andrey AKSENOV3 SUMMARY Experiments fulfilled in CETIM have shown that tonal blade-passing-frequency (BPF) noise becomes predominant for lawn-mowers with a big rotor diameter. 2-D and 3-D CFD unsteady computations give a clear picture of pseudo-sound perturbation inside the casing of lawn-mower. Method of representation of unsteady motion [...]
Read More >>RESULTS OF 3D COMPUTATION
By admin at 21 October, 2009, 2:08 pm
RESULTS OF 3D COMPUTATION The 3D method is currently validated on centrifugal pumps and lawn mowers. The lawn mower consists of a volute casing and a rotor with two cutting blades. The complex mixed-type flow presents due to the air intake through the gap between the volute and ground [15, 23]. Computational domain is shown [...]
Read More >>Numerical methods
By admin at 21 October, 2009, 1:46 pm
Numerical methods For the analysis of the problem, the 2D code Harmony [11--13] and the 3D code FlowVision [14--16] are used. In 2D analysis the vortex mode flow is computed in 2 steps. In the first step the flow around rotor is defined by the discrete vortex method that applies a “sliding-break-point” conditions on blades. [...]
Read More >>COMPUTATIONAL AND EXPERIMENTAL STUDY
By admin at 21 October, 2009, 12:45 pm
S. F. Timouchev, A. K. Nedashkovsky COMPUTATIONAL AND EXPERIMENTAL STUDY OF PRESSURE PULSATIONS AND NOISE IN AN AXIAL FAN The goal of work is validation of the method of noise and pseudo-sound pressure pulsations in the axial fan. 3D numerical modeling of pressure pulsations and acoustical waves is completed on blade passing tones for the [...]
Read More >>Method
By admin at 16 October, 2009, 3:26 pm
Numerical method based on a representation of unsteady velocity field of compressible fluid as a vector sum of a vortex incompressible flow and an acoustic motion. By assuming subsonic isentropic pump flow and neglecting viscous effects this leads to acoustic-vortex equation relative to enthalpy oscillations. The last are proportional to pressure oscillation as the sum [...]
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