Research On Performance Of Two-stage Axial Flow Ventilator With Compressible Medium

With the rapid development of industrialization,ventilators are widely used in thermal power,metallurgy,tunnel,petrochemical and other industries,especially under the request of environmental protection.Large-scale,high pressure ratio,high flow coefficient axial ventilators are becoming increasingly common.Therefore,to solve the problem of ventilators high-efficiency operation,especially to improve the efficiency of operating ventilators,has great economic and social value.Rapid development of CFD technology provides a convenient and effective means of studying the flow field and the performance of the ventilator.In this paper,numerical experiment was carried out under multiple operating conditions with NUMECA software,modeled in IGG module,employed structured mesh and Spalart-Allmaras turbulent flow model,then calculated in FINE module.Compared calculation results with the experimental results,this paper determined the reliability of the calculation model and calculation methods,and got a variety of flow phenomena.According to the calculation results,the compressibility of the high-pressure ventilator was identified.It considered the optimization of the ventilator to improve the operating efficiency as the prerequisite,and adapted to the compressibility of the medium by adjusting the second-stage blades pre-installation angle to control the flow area,then carried out the numerical simulation of the modified model.This would help us qualitatively determine that it could improve ventilator efficiency in a specific operating area.This study will provide a research to high-efficiency energy-saving direction for the development of high-pressure ventilator in the future.