Performance analysis method of centrifugal impeller

• US 6,466,896 B1
• Filed: 06/09/2000
• Issued: 10/15/2002
• Est. Priority Date: 10/08/1999
• Status: Expired due to Fees

• Current Assignee: Sun Moon University
• Original Assignee: Jae-Won Kim, Sun Moon University
• Inventors: Kim, Jae-Won
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): Choi, Sam H.
• Application Number:
  US09/590,298
• Time in Patent Office: 858 Days
• Field of Search: 73/11.6, 73/13.7, 731/701.1, 731/701.5, 738/61, 738/613.5, 738/613.9, 738/616.9, 732/27, 731/95--96, 415/1, 415/233, 416/1, 416/61, 416/248, 416/183, 416/33, 416/44, 416/45, 702/47, 702/50, 702/48, 702/105, 702/108, 702/113, 702/114, 702/138, 702/140, 702/182, 702/183
• US Class Current: 702/183
• CPC Class Codes: F04D 27/001 Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring

Abstract

A performance analysis method for a centrifugal impeller adapter to simplify performance analysis of an impeller and to obtain an accurate calculation result in comparison with analysis by way of averaging the entire flow of the centrifugal impeller. The method for measuring a flow field at an impeller exit analyzes an exit flow angle, total pressure ratio and efficiency, to enable analysis of the performance of the manufactured centrifugal impeller, wherein the flow field of the centrifugal impeller at the impeller exit is dualized into a jet region flow field and a wake region flow field, by which each flow field is sought and averaged to obtain the flow field.

Claims

1. A performance analysis method of centrifugal impeller, the method for measuring a flow field at an impeller exit to analyze an exit flow angle, total pressure ratio and efficiency, thereby enabling to analyze performance of the manufactured centrifugal impeller, wherein the flow field of the centrifugal impeller at the impeller exit is dualized into a jet region flow field and a wake region flow field, by which each flow field thereof is sought and averaged to obtain the flow field;

and

wherein the flow slip coefficient of the jet region and the wake region flow field in consideration of mass ratio change at wake region are obtained by Formula below;

${\mathrm{\mu <br><br>}}_j=1-f_1<br><br>\frac{A_{2<br><br>j}}{r_2<br><br>b_2<br><br>Z},f_1=5.73\times <br><br>{10}^{-6}<br><br>{\left(90-{\mathrm{\beta <br><br>}}_{2<br><br>b}\right)}^{5/2}$

μ

_j;

flow slip coefficient of jet region

A_2j;

jet region area at impeller exit

r₂;

radius of impeller

b₂;

exit width of impeller

Z;

number of blades at impeller exit

β

_2b;

impeller blade exit angle (axially interpreted)

2. The method as defined in claim 1, wherein a flow slip coefficient of jet region at the impeller exit is considered and a wake mass ratio change is considered at the wake region, to thereby obtain the flow field at the impeller exit.