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1
Content available Analysis of flow structure and performance of the centrifugal compressor impeller
Grzelczak M., Tralewski A., Pałucki Z.
Transactions of the Institute of Fluid-Flow Machinery
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2016
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nr 132
87--101
EN
The presently applied desulfurization technologies require a supply of air through centrifugal compressors realizing the pressure increment on the level of 150–200 kPa. Taking the necessary mass flow rate of the processed air into account it is necessary to increase the efficiency of the compression process realized in these machines. The paper will include the results of the works related to the analysis of the gas flow in the compression stage operating with two impellers. The first one has been described with a mathematical function preserving the condition of ruled surface and the geometry of the other impeller has been modeled according to the shape of the meridional velocity profile in the inlet section thus forming leading edge. The common feature of both impellers is the same mathematical function that describes the meridional section and the profile of the blade. The outer diameter of each of the impellers is 200 mm and the blade angle in the outlet section 45◦. The compression stage reaches the pressure ratio of 1.4 at the nominal mass flow of 0.73 kg/s maintaining the impeller rotational speed on the level of 24 400 rpm. For the evaluation of the operating parameters and the nature of the gas flow in the compression stage operating with two impellers computational fluid dynamics simulations were carried out and experimental research has been performed using laser Doppler anemometry for impeller of ruled surface.
2
Content available remote Multi-stage radial blowers
Walczak J., Grzelczak M., Pałucki Z., Tralewski A.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2011
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nr 140
215-224
EN
Multi-stage blowers have a wide scope of applications in terms of pressure increment of up to 1 bar and capacity of 50.000 m3/h. They have a series of strong points and are competitive for other blowers. As part of research and development works very comprehensive analyses of variants of solutions are conducted for the purposes of determining of a concept of series of types, which involves indication of diameters and number of stages, which should be used for obtaining of set values of efficiency and pressure. Preliminary proposals have been established. A program of experimental and theoretical tests was also established.
3
Content available remote Comparison of flow in the unshrouded-type rotors on the basis of computational fluid dynamics (CFD) calculations
Pałucki Z.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2011
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nr 140
179-186
EN
The paper presents results of numerical measurements of flow of the actual fluid in variants of geometries of an unshrouded rotor. The comparisons will relate to geometries of rotors with the same outer diameters - d2, blades angles - β 2, widths of the rotor blades in the cross-section 2 - b2 and the number of blades - zw; however, characterized by different methods of shaping of the blade curvature, The rotors were analyzed during design works relating to a three-stage radial compressor. In each stage of the machine similar rotors will be used. Such rotors are also to be applied in structures of series of types of single stage blowers. Characteristics of efficiency, compression power and pressure increment as a function of the stream of the flowing agent will be determined for the analyzed rotors.
4
Content available remote Analysis of the flow in the vaned return channel on the basis of computational fluid dynamics (CFD) calculations
Pałucki Z., Tralewski A.
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2011
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nr 140
187-194
EN
The paper presents solutions of flow of viscous and compressible fluids through the return channel realized with the use of ANSYS - CFX program. The presented results were obtained during realization of the project aiming at development of optimum structures of series of types of multi-stage radial blowers. This paper contains results including solutions for five mass streams. On the basis of the solutions, flow loss coefficient will be determined.
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