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

Abstract

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.

Peculiarities of numerical simulation of air/heat curtain operation in OpenFOAM

“…В этом случае целесообразно использовать методы вычислительной газовой динамики, которые широко применяются для моделирования аэродинамических течений в различных технических устройствах. Численное моделирование используется как для исследования нестационарной аэродинамики и теплообмена, протекающих в рабочих (внутренних) областях устройств [5,7,[9][10][11], так и для расчета формы и траектории оси воздушных струй в помещении после их истечения из воздушно-тепловой завесы [12]. В настоящей работе на основе методов вычислительной газовой динамики анализируется течение вязкого, сжимаемого, теплопроводного газа в рабочем объеме воздушно-тепловой завесы.…”

Optimization of inverse-Prandtl of Dissipation in standard k-ε Turbulence Model for Predicting Flow Field of Crossflow Turbine

“…On the other hand, the numerical studies of the Standard 𝑘 − 𝜀 model conducted by some authors [10][11][12][13][14][15][16][17][18] showed relatively good results and robustness but the model is still less accurate in predicting the flow details, especially in rotating, recirculating, and large separation flow. The Standard k-ε model tends to cause higher turbulent kinetic energy, turbulent dissipation, and turbulent viscosity than the actual conditions.…”

Theoretical Research of the Internal Gas Dynamics Processes of Measurements of Hot Air Curtain With Cross-Flow Fan

“…In this case methods of computation of gas dynamics widely used for aerodynamic flotation simulation in various technical devices are more preferable. Computational simulation is used both for studying the unsteady aerodynamics and heat exchange in operating (internal) spaces of devices [Khosrowpanah 1988, Kim 2008, Darmawan 2015, Sun 2015, Bako 2016, Baranov 2017, Sharfarets 2018, Pivarčiová 2019] and for calculation of shape and airstream axis course indoors after it is blown out of the air curtain [Diskin 2003, Menter 2003, Kruglova 2006, Frank 2014, Grigoriev 2016, Li 2016, Gilyazetdinov 2018, Diametrically 2019, Simulation 2019]. Computational studies of gas dynamic processes in an air curtain displacement volume are essential for device performance parameters estimation (air efficiency, noise level, narrowness and average temperature of exhausting flow, aerodynamics losses in air curtain flow channel) as well as for air curtain design optimization i.e.…”