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Centrifugal fans: Similarity, scali...

Sardar, Asad Mohammad.

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Centrifugal fans: Similarity, scaling laws, and fan performance.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Centrifugal fans: Similarity, scaling laws, and fan performance./
Author:	Sardar, Asad Mohammad.
Description:	365 p.
Notes:	Source: Dissertation Abstracts International, Volume: 62-04, Section: B, page: 2028.
Contained By:	Dissertation Abstracts International62-04B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3010865
ISBN:	9780493209937

Centrifugal fans: Similarity, scaling laws, and fan performance.
Sardar, Asad Mohammad.

Centrifugal fans: Similarity, scaling laws, and fan performance. - 365 p.

Source: Dissertation Abstracts International, Volume: 62-04, Section: B, page: 2028.

Thesis (Ph.D.)--State University of New York at Buffalo, 2001.

Centrifugal fans are rotodynamic machines used for moving air continuously against moderate pressures through ventilation and air conditioning systems. There are five major topics presented in this thesis: (1) analysis of the fan scaling laws and consequences of dynamic similarity on modelling; (2) detailed flow visualization studies (in water) covering the flow path starting at the fan blade exit to the evaporator core of an actual HVAC fan scroll-diffuser module; (3) mean velocity and turbulence intensity measurements (flow field studies) at the inlet and outlet of large scale blower; (4) fan installation effects on overall fan performance and evaluation of fan testing methods; (5) two point coherence and spectral measurements conducted on an actual HVAC fan module for flow structure identification of possible aeroacoustic noise sources.

ISBN: 9780493209937Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Centrifugal fans: Similarity, scaling laws, and fan performance.
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020 $a 9780493209937
035 $a (UMI)AAI3010865
035 $a AAI3010865
040 $a UMI $c UMI
100 1 $a Sardar, Asad Mohammad. $3 1917339
245 1 0 $a Centrifugal fans: Similarity, scaling laws, and fan performance.
300 $a 365 p.
500 $a Source: Dissertation Abstracts International, Volume: 62-04, Section: B, page: 2028.
500 $a Adviser: William K. George, Jr.
502 $a Thesis (Ph.D.)--State University of New York at Buffalo, 2001.
520 $a Centrifugal fans are rotodynamic machines used for moving air continuously against moderate pressures through ventilation and air conditioning systems. There are five major topics presented in this thesis: (1) analysis of the fan scaling laws and consequences of dynamic similarity on modelling; (2) detailed flow visualization studies (in water) covering the flow path starting at the fan blade exit to the evaporator core of an actual HVAC fan scroll-diffuser module; (3) mean velocity and turbulence intensity measurements (flow field studies) at the inlet and outlet of large scale blower; (4) fan installation effects on overall fan performance and evaluation of fan testing methods; (5) two point coherence and spectral measurements conducted on an actual HVAC fan module for flow structure identification of possible aeroacoustic noise sources.
520 $a A major objective of the study was to identity flow structures within the HVAC module that are responsible for noise and in particular "rumble noise" generation. Possible mechanisms for the generation of flow induced noise in the automotive HVAC fan module are also investigated. It is demonstrated that different modes of HVAC operation represent very different internal flow characteristics. This has implications on both fan HVAC airflow performance and noise characteristics.
520 $a It is demonstrated from principles of complete dynamic similarity that fan scaling laws require that Reynolds, number matching is a necessary condition for developing scale model fans or fan test facilities. The physical basis for the fan scaling laws derived was established from both pure dimensional analysis and also from the fundamental equations of fluid motion.
520 $a Fan performance was measured in a three times scale model (large scale blower) in air of an actual forward curved automotive HVAC blower. Different fan testing methods (based on AMCA fan test codes) were compared on the basis of static pressure measurements. Also, the flow through an actual HVAC fan-impeller/diffuser section in water was observed with a flow visualization technique using a shear-thickening dye (in addition to a conventional dye). Full dynamic similarity was maintained between RVAC operation in water as when operated in air. Recommendations are provided both for further investigation of critical flow regions with more sophisticated measurement methods and for improved fan-scroll design to reduce possible aeroacoustic noise with improved aerodynamic performance.
590 $a School code: 0656.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Automotive. $3 1018477
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0538
690 $a 0540
690 $a 0548
710 2 0 $a State University of New York at Buffalo. $3 1017814
773 0 $t Dissertation Abstracts International $g 62-04B.
790 1 0 $a George, William K., Jr., $e advisor
790 $a 0656
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3010865