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Influence of Air Humidity on Transonic Flows with Weak Shock Waves

Journal of Thermal Science 2020年第6期29卷 1551-1557页

作者： DYKAS Slawomir majkut miroslaw SMOLKA Krystian Institute of Power Engineering and Turbomachinery Silesian University of TechnologyKonarskiego 18Gliwice 44-100Poland

The paper presents CFD results for the transonic flow of dry and moist air through a diffuser and a compressor *** both test geometries,*** Sajben transonic diffuser and the NASA Rotor 37,the air humidity impact on the structure of flows with weak shock waves was *** CFD simulations were performed by means of an in-house CFD code,which was the RANS-based modelling approach to compressible flow *** is shown that at high values of relative humidity,above 70%,the modelling of the transonic flow field with weak shock waves by means of the dry air model may produce wrong results.

关键词： dry air moist air transonic flow weak shock wave steam condensation

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Liquid Phase Evaporation on the Normal Shock Wave in Moist Air Transonic Flows in Nozzles

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Journal of Thermal Science 2017年第3期26卷 214-222页

作者： Slawomir Dykas Artur Szymański miroslaw majkut Institute of Power Engineering and Turbomachinery Silesian University of Technologyul.

This paper presents a numerical analysis of the atmospheric air transonic flow through de Laval nozzles. By nature, atmospheric air always contains a certain amount of water vapor. The calculations were made using a Laval nozzle with a high expansion rate and a convergent-divergent(CD) "half-nozzle", referred to as a transonic diffuser, with a much slower expansion rate. The calculations were performed using an in-house CFD code. The computational model made it possible to simulate the formation of the liquid phase due to spontaneous condensation of water vapor contained in moist air. The transonic flow calculations also take account of the presence of a normal shock wave in the nozzle supersonic part to analyze the effect of the liquid phase evaporation.

关键词： moist air condensation transonic flow shock wave CFD simulation in-house code

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An Attempt to Evaluate the Cycloidal Rotor Fan Performance

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Open Journal of Fluid Dynamics 2019年第4期9卷 292-302页

作者： Tomasz Stasko Slawomir Dykas miroslaw majkut Krystian Smolka Silesian University of Technology Institute of Power Engineering and Turbomachinery Gliwice Poland

In this work, the cycloidal rotor fan (CRF) performance was estimated by means of a numerical method based on Unsteady Reynolds Averaged Navier-Stokes equations (URANS). The fan with a cycloidal rotor belongs to the positive displacement machines of the rotary type. The numerical algorithm for simulation of the flow in the cycloidal rotor as well as postprocessing of the CFD results was prepared using Ansys CFX CEL. The methodology for the assessment of the CRF performance was proposed and verified. It was found out that the CRF performance strongly depends on the shape of the profile of the applied rotor blade. The NACA 0012 and CLARK Y profiles were tested for the same CRF structure and flow conditions. Also, the crucial importance for the CRF performance has the range of the blade pitch angle change.

关键词： Cycloidal Rotor Computational Fluid Dynamics Fan Performance

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