Analysis of Vortical Flow Field in a Propeller Fan by LDV Measurements and LES—Part I: Three-Dimensional Vortical Flow Structures
Author:
Jang Choon-Man1, Furukawa Masato1, Inoue Masahiro1
Affiliation:
1. Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
Abstract
Three-dimensional structures of the vortical flow field in a propeller fan with a shroud covering only the rear region of its rotor tip have been investigated by experimental analysis using laser Doppler velocimetry (LDV) measurements and by numerical analysis using a large eddy simulation (LES) in Part I of the present study. The propeller fan has a very complicated vortical flow field near the rotor tip compared with axial fan and compressor rotors. It is found that three vortex structures are formed near the rotor tip: the tip vortex, the leading edge separation vortex, and the tip leakage vortex. The tip vortex is so strong that it dominates the flow field near the tip. Its formation starts from the blade tip suction side near the midchord. Even at the design condition the tip vortex convects nearly in the tangential direction, thus impinging on the pressure surface of the adjacent blade. The leading edge separation vortex develops close along the tip suction surface and disappears in the rear region of the rotor passage. The tip leakage vortex is so weak that it does not affect the flow field in the rotor.
Publisher
ASME International
Subject
Mechanical Engineering
Reference27 articles.
1. Fukano, T., Fukuhara, M., Kawagoe, K., Hara, Y., and Kinoshita, K., 1990, “Experimental Study on the Noise Reduction of a Propeller Fan, 1st Report, Aerodynamic Characteristics,” Trans. Jpn. Soc. Mech. Eng., Ser. B, 56, No. 531, pp. 3378–3382 (in Japanese). 2. Fukano, T., Kawagoe, K., Fukuhara, M., Hara, Y., and Kinoshita, K., 1990, “Experimental Study on the Noise Reduction of a Propeller Fan, 2nd Report, Noise Characteristics,” Trans. Jpn. Soc. Mech. Eng., Ser. B, 56, No. 531, pp. 3383–3388 (in Japanese). 3. Sato, S., and Kinoshita, K., 1993, “Improvement in Performance of Propeller Fans for Outdoor Units of Airconditioners,” Proceeding of the 4th Asian International Conference on Fluid Machinery, Vol. 1, pp. 166–170. 4. Akaike, S., and Kikuyama, K., 1993, “Noise Reduction of Pressure Type Fans for Automobile Air Conditioners,” ASME J. Vibr. Acoust., 115, pp. 216–220. 5. Akaike, S., Kuroki, S., and Katagiri, M., 1991, “Noise Reduction of Radiator Cooling Fan for Automobile—Three-Dimensional Analysis of the Flow Between the Blades of the Fan-,” JSAE (Society of Automotive Engineers of Japan), 22, No. 3, pp. 79–84 (in Japanese).
Cited by
55 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|