원호익을 갖는 원심펌프 임펠러의 성능에 관한 수치해석 = Numerical Analysis on the Performance of Centrifugal Pump Impeller with Circular Arc Blade

다국어 초록 (Multilingual Abstract)

A centrifugal pump may be considered to be composed of three parts ; a stationary inlet device, a rotating component of impeller, and a recuperating device. The fluid motions in a centrifugal pump are complex. The velocity vectors are not parallel to the walls of the fluid passages, and appreciable secondary motions occur near the impeller discharge and in the diffusing. The flows in these three parts will be interdependent and a correct flow analysis should take into account this interdependence. however, a satisfactory theory that takes into account the combined effect of all these three components on a real fluid stream flowing through the pump is not yet available. For this reason the problem is usually simplified as far as possible, retaining only the essentials.
This study limited on the impeller blade design with circular are blade and its related performance analysis. The designed impeller will be described on the screen by graphic of fortran languge. In the following, flow fields in a centrifugal impeller of circular are blades with a sharp leading edge are analysed by adopting a 2nd order accuracy vortex panel method with the following assumption ;
a) The flow field is assumed to be two dimensional, inviscid, incompressible,
irrotational, except singular points and steady on the rotating coordinate system.
b) The effect of volute easing, inlet turn and prerotation is not considered here.
c) The inlet velocity along the breadth direction is also assumed to be constant in magnitude and direction.
d) Dimensionless flow rate coefficient at maximum efficiency is 0.216
(Q=0.256㎥/min, r²=100㎜, b₂=15㎜, speed=200rpm)
The velocity field along the circular arc blade surfaces are examined for various flow rates, blade numbers.
This study shows that theoretical head can be calculated without difficulty using vortex panel method.

목차 (Table of Contents)

• Abstract
• Ⅰ. 서론
• Ⅱ. 원심펌프 임펠러내의 유동 표시
• Ⅲ. 양정계산
• Ⅳ. 임펠러익 형상설계
• 1. 익수 및 출구각
• 2. 익형상 설계
• Ⅴ. 수치해석결과 및 고찰
• 1. 임펠러익의 계산조건
• 2. 결과 및 고찰
• Ⅵ. 결론
• 참고문헌