Abstract
Experiments were conducted to investigate the effect of impeller geometry and tongue shape on the flow field of cross flow fans. Three impellers (I, II, III) having same outer diameter, but different radius ratio and blade angles were employed for the investigation. Each impeller was tested with two tongue shapes. Flow survey was carried out for each impeller and tongue shape at two flow coefficients, and for each flow coefficient at different circumferential positions. The flow is two-dimensional along the blade span except near the shrouds. The total pressure developed by the impellers in each case is found to be maximum at a circumferential position of around 270°. The total and static pressures at the inlet of impellers are more or less same regardless of impeller and tongue geometry, but they vary considerably at exit of the impellers. Impeller III with tongue T 2 develops higher total pressure and efficiency where as impeller II with tongue T 2 develops minimum total pressure. Higher diffusion and smaller vortex size are the reasons for better performance of impeller III with tongue T 2.
Similar content being viewed by others
References
Ilberg, H, Sadeh, W Z. Theory and Performance of Tangential Fans. Proc. Instn. Mechanical Engineers, 1965–66, 180(Part 1,19): 481–490
Porter, A M, Markland, E. A Study of the Cross Flow Fan. J. of Mechanical Engineering Science, 1970, 12(6): 421–431
Murata, S, Nishihara, K. An Experimental Study of Cross Flow Fan (1st Report, Effects of Housing Geometry on the Fan Performance). Bulletin of JSME, 1976, 19(129): 314–321
Murata, S, Nishihara, K. An Experimental Study of Cross Flow Fan (2nd Report, Movement of Eccentric Vortex Inside the Impeller). Bulletin of JSME, 1976, 19(129): 322–329
Takushima, A, Shinobu, Y, Tanaka, S, et al. Flow Measurements by Laser Doppler Velocimeter in a Cross Flow Fan for Air Conditioning Use. ASHRAE Transactions, 1990, 96(Part I): 497–501
Arai, T, Sugiyama, H, Soeharto, Y, et al. Flow Visualization and LDV Investigations of Flow Characteristics of Cross Flow Fan. Transactions of the JSME, Series B, 1995, 61(583): 967–973
Tsurusaki, H, Shimizu, H, Tsujimoto, Y, et al. Study of Cross Flow Fan Internal Flow by Flow Visualisation (Discussion of Measured Results by Particle-Tracking Velocimetry). JSME International Journal, Series B, 1996, 39(3): 540–545
Matsuki, K, Shinobu, Y, Takushima, A, et al. Experimental Study of Internal Flow of a Room Air Conditioner Incorporating a Cross Flow Fan. ASHRAE, Transactions, 1988, 94(part 1): 350–364
Chen, P H, Lee, D S. Effect of Tongue Shape on the Performance Curve and the Acoustic Noise of Cross Flow Fan. J. of Chinese Society of Mech. Engineers, 1995, 16(5): 445–455
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Govardhan, M., Venkateswarlu, G. Effect of impeller geometry and tongue shape on the flow field of cross flow fans. J. of Therm. Sci. 12, 118–125 (2003). https://doi.org/10.1007/s11630-003-0052-6
Issue Date:
DOI: https://doi.org/10.1007/s11630-003-0052-6