Simulation of Atmospheric Flow Characteristics and Selection of Models for Artificial Simulated Fog-Haze Environment

Jiawei Yin,Shuai Li,Haiming Zheng

doi:10.1109/access.2020.2966215

Abstract

The devices for artificial flashover experiment should be constructed and the stability of the airflow field is the key to construct it. This work presents a methodology of constructing three models respectively without blades, with straight blades and with curved blades, coupled for artificial simulated fog-haze environment with computational fluid dynamics (CFD), to predict the impact of the rotating blades on the flow velocities in the enclosed environment by simulation. Atmospheric flow characteristics and variation of flow velocities were analyzed, and the influences of different rotating blades on flow velocities were compared to get the related simulation results in three models. It is showed that the flow velocities increase with the increase of device’s Y coordinate. Compared with the variation of flow velocities in the model without blades, it is confirmed that the variation of flow velocities in two models with blades is reduced relatively, in which the variation of flow velocities in the model with straight blades is lower and more stable. Therefore, the designed model with straight blades will be developed for artificial flashover experiment.

Highlights

Fog-haze is the combination of sprays and particles, and its essence is the special weather phenomenon of air pollution
It can be seen that the inlet flow velocity in numerical simulation can be set as 1m/s and the flow direction is perpendicular to the entrance of the device
SELECTION OF SAMPLING AREAS Given that three models have the same appearance structures except for blades, the paper presents the schematic views of sampling domains in the model with straight blades, the same sampling domains of the models without blades and with straight blades are no longer listed

Summary

INTRODUCTION

Fog-haze is the combination of sprays and particles, and its essence is the special weather phenomenon of air pollution. It is very difficult to further research in natural atmospheric environment and we need to develop an experimental platform that can simulate fog-haze more effectively. Many researchers addressed large number of works on the influence of haze deposition on the external insulation of power transmission and transformation equipment by constructing many kinds of artificial fog-haze experimental platforms. VOLUME 8, 2020 haze simulation models with different blades and simulating the characteristics of atmospheric flow and predicting the variation of flow rate in the models by CFD Fluent. The effects of different blades rotation on the atmospheric flow are compared to obtain the related simulation results to provide a reliable theoretical basis for the design of the device for simulated fog-haze environment. The steady motion of a fluid in an incompressible system is considered, and its continuous equation in a cylindrical coordinate system can be written as (3):

SELECTION OF TURBULENCE MODEL

RESULTS AND DISCUSSION

CONCLUSION