축류형 송풍기의 성능 예측 방법에 대한 비교연구 및 설계개선 = Comparative study and design improvement of the performance prediction method of axial flow fan

다국어 초록 (Multilingual Abstract)

An analysis method is presented for predicting the performance of fan used in power plant or air-conditioning system, and then is applied toactual high and low pressure fans to verify the prediction accuracy ofthe present method. Based on the present method, design sensitivity analysis are conducted to know the influences of fan blade design variables on the on-design point efficiency, and show that the remarkable enhancement can be achieved in the fan efficiency at on-design point through the proper combination of fan blade design variables, Furthermore, four different optimal blade design combinations are derived for the on-design point efficiency maximization from the sensitivity analysis results of high and low pressure fans respectively, and their off-design peformance characteristics are examined with each design combination. The investigation results show that the fan operating with relatively high efficiency over entire off-design operation range tends to result in the shrinking in the operation range due to the reduction of surge margin or the decrease of discharge pressure.

목차 (Table of Contents)

• 목차
• 그림목차 = i
• 표목차 = ii
• 기호설명 = iii
• 제1장 서론 = 1
• 제2장 이론 및 해석결과 = 4
• 2.1 축류형 송풍기의 설계과정 = 4
• 2.1.1 설계요구사항 및 설계변수의 결정 = 6
• 2.1.2 평균반경에서의 유동계산 = 6
• 2.1.3 반경방향 익렬각설계 = 9
• 2.1.4 익형선정 = 10
• 2.1.5 성능해석 = 11
• 2.2 단축척법(Stage-Stacking Method) = 12
• 2.2.1 평균반경 유체흐름의 가정 = 12
• 2.2.2 단(stage)의 무차원 특성 모델링 = 13
• 2.2.3 축방향 단축척과정(Axial stacking procedure) = 14
• 2.2.4 해석방법의 예측결과 및 검증 = 15
• 2.3 준3차원 성능해석방법 = 18
• 2.3.1 유선곡률방법 = 18
• 2.3.2 유동편차각 모델 = 20
• 2.3.3 전압력손실 모델 = 21
• 2.3.4 계산방법 = 24
• 2.3.5 예측방법의 검증 = 27
• 2.3.6 설계변수 및 작동조건에 따른 성능변화 예측결롸 = 31
• 2.3.7 설계변수 최적화 및 민감도분석 = 44
• 제3장 결론 = 52
• 참고문헌 = 54
• ABSTRACT
• 감사의 글