Analysis of flow structure and performance of the centrifugal compressor impeller

• Autorzy: Grzelczak M. , Tralewski A. , Pałucki Z.
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

centrifugal compressors; cross-section of the rotor; velocity fluctuation; tangential/meridional velocity; comppressor impellers

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2016
• Tom: nr 132
• Strony: 87--101
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Grzelczak M.

• Poznan University of Technology, Chair of Thermal Engineering, Maria Skłodowska-Curie Square 5, 60-965 Poznan, Poland

autor

Tralewski A.

• Poznan University of Technology, Chair of Thermal Engineering, Maria Skłodowska-Curie Square 5, 60-965 Poznan, Poland

autor

Pałucki Z.

• Poznan University of Technology, Chair of Thermal Engineering, Maria Skłodowska-Curie Square 5, 60-965 Poznan, Poland

Bibliografia

• [1] Eckardt D.: Detailed flow investigation with in a high – speed centifugal compressor impeller. J. Fluids Eng.-T. ASME 98(1976), 390–402.
• [2] Eisenlohr G., Krain H., Richter F. A., Tiede V.: Investigations of the flow through a high pressure ratio centrifugal impeller. ASME (2002), GT-2002-30394.
• [3] Grzelczak M.: Analysis of the flow of gas in a compressor impeller on the basis of velocity measurements with the use of LDA laser anemometer. In: Proc. Int. Conf. SYMCOM’11, Turbomachinery, Łódź 2011.
• [4] Grzelczak M.: The influence of the impeller inlet blades on the efficiency of the blower. In: Proc. Int. Conf. SYMCOM’11, Turbomachinery, Łódź 2011.
• [5] Higashimori H., Hasagawa K., Sumida K., Suita T.: Detailed flow study of mach number 1.6 high transonic flow with a shock wave in a pressure ratio 11 centrifugal compressor impeller. ASME (2004), 2004-GT-53435.
• [6] Japikse D.: Centrifugal Compressor Design and Performance. Berlin, Sept. 24–28, 2(1990), 4–16.
• [7] Krain H., Karpinski G., Beversdorff M.: Flow analysis in a transonic centrifugal compressor rotor using 3-component laser velocimetry. ASME (2001), 2001-GT-315.