A sirocco fan consists of a housing and an impeller with blades. There are many design parameters for improving its performance and efficiency. Thus, the objective of present study is to investigate the effect of blade size(such as blade length and height) and the number of blades on the flow characteristics of a sirocco fan using a commercial CFD software, Star CCM+. From the results of our previous and present study, it is revealed that blade inclination angle and blade height had a great effect on the flow characteristics, such as the static pressure rise and flow rate. There are important factors in improving the flow characteristics, as following order, the blade inclination angle, blade height, blade length, blade radius of curvature, the number of blades. it was obtained that maximum in static pressure rise and flow rate were, respectively, 20.8Pa and 6.41CMM under the our simulation condition.

Abstract
1. 서 론
2. 수치 해석 방법
    2.1 해석 모 델 및 제원
    2.2 해석 방법 및 경계조건
3. 수치 해석 결과
    3.1 블레이드 길이 영향
    3.2 블레이드 높이 영향
    3.3 블레이드 개수 영향
    3.4 블레이드 설계 변수별 영향 비교
4. 결 론
References

• 조홍기(Ph.D. degree in Mechanical Engineering from SungKyunKwan University) | Honggi Cho Corresponding author