Effect of suction nozzle modification on the performance and aero-acoustic noise of a vacuum cleaner |
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Authors: | Cheol-Woo?Park Sang-Ik?Lee Email author" target="_blank">Sang-Joon?LeeEmail author |
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Affiliation: | (1) School of Mechanical Engineering, Kyungpook National University, 702-701 Daegu, Korea;(2) Department of Mechanical Engineering, Pohang University of Science and Technology, 790-784 Pohang, Korea |
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Abstract: | The suction nozzle of a vacuum cleaner was modified to enhance the power performance and to reduce the airflow-induced acoustic
noise. The suction power efficiencies of the vacuum cleaner were measured for various nozzles: (1) original nozzle, (2) original
nozzle with modified trench height, (3) original nozzle with modified connecting chamber, and (4) a combination of (2) and
(3). In addition, the suction pressure and sound pressure level around the suction nozzle were measured to validate the reduction
of acoustic noise. The power efficiency and mean suction pressure increased when the trench height of the suction nozzle was
increased. This was attributed to the suppression of the flow separation in the suction channel. Modification of the connecting
chamber in the original nozzle, which had an abrupt contraction from a rectangular chamber into a circular pipe, into a smooth
converging contraction substantially improved the suction flow into the connecting pipe. When both modifications were applied
simultaneously, the resulting suction nozzle was more effective from the viewpoints of aerodynamic power increase and sound
pressure level reduction. |
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Keywords: | Vacuum Cleaner Suction Nozzle Aerodynamic Power Suction Pressure Sound Pressure Level |
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