Visualization Measurement and Numerical Analysis of Internal Flow in Cross-Flow Fan

Park

et al. 2008

J Mech Sci Technol

A cross-flow fan having forward curved blades relatively produces higher dynamic pressure at low rotating speed because a working fluid passes through an impeller blade twice. Most of this dynamic pressure is transferred to the static pressure in a rearguider and a stabilizer as a scroll in the centrifugal fan. The effect of a rearguider and a stabilizer on the performance of a cross-flow fan is higher than that of the impeller. Therefore, it should be considered how the shape of a rearguider and an exit duct affects on the performance and the flow fields. The purpose of this study is to investigate the reciprocal relation to the flow field and performance among the design parameters. Two-dimensional, unsteady governing equations are solved using FVM algorithm, sliding grid system and standard k ε − turbulence model. Velocity profiles with various parameters are depicted. Furthermore, the meridional velocity profiles around the impeller are plotted at fixed rotating speed and design flow rate.

Section: Introductionmentioning

confidence: 99%

Performance of a cross-flow fan with various shapes of a rearguider and an exit duct

Park

et al. 2008

J Mech Sci Technol

“…First, he studied the eccentric vortex through flow visualization. Tsurusaki et al [2,3] measured the velocity of the internal flow in the cross-flow fan using particle tracking velocimetry (PTV). They also found the path line and velocity distribution using a digital camera and studied the generation and diffusion of the vorticity induced by the eccentric vortex.…”

Section: Introductionmentioning

confidence: 99%

The effect of blade angle on the flow and pressure distributions in the vicinity of the diffuser blades of a room air conditioner

Seo

2009

J Mech Sci Technol

Many studies on air-conditioning systems are more focused on the individual thermal comfort rather than the thermal efficiency, due to an increase in health concerns. There are several factors influencing the thermal comfort, such as temperature, humidity, convection and air movement, etc. Numerical analyses were performed to investigate the effect of blade angle on the flow characteristics in the vicinity of diffuser blades of a room air conditioner (RAC), with three different blade discharge angles of 45.1 • , 58.6 • and 116 • . We used the commercial code FLUENT to calculate the twodimensional steady thermal flow fields with different impeller rotational velocities. The angular velocities were located within the range from 900 rpm to 1200 rpm. Turbulence closure was achieved using a standard k-ε model. A moving reference frame (MRF) approach was adopted to simulate the flow field generated by the impeller in an RAC. The results were graphically depicted with various geometrical configurations and operating conditions.

“…There have been a number of previous works for various kinds of performance characteristics of cross-flow fans in the open literature (Tanaka [1]; Tsurusaki et al [2]; Lazzaretto et al [3]; Matsuki et al [4]). Experimental investigations to verify the validity of similarity laws have been made by Tanaka and Murata [5,6].…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction of Cross‐Flow Fans Using Mean Streamline Analysis

International Journal of Rotating Machinery

Ahn²,

2005

This paper presents the mean streamline analysis using the empirical loss correlations for performance prediction of cross-flow fans. Comparison of overall performance predictions with test data of a cross-flow fan system with a simplified vortex wall scroll casing and with the published experimental characteristics for a cross-flow fan has been carried out to demonstrate the accuracy of the proposed method. Predicted performance curves by the present mean streamline analysis agree well with experimental data for two different cross-flow fans over the normal operating conditions. The prediction method presented herein can be used efficiently as a tool for the preliminary design and performance analysis of general-purpose cross-flow fans.