Abstract
Cooling in a centrifugal compressor can improve the performance and reduce the impeller temperature. In a centrifugal compressor, external walls can be cool down, which is known as the shell cooling. This method avoids undesirable effects induced by other cooling methods. Cooling can be applied on different external walls, such as the shroud, diffuser or the back plate. This paper focuses on seeking the most effective cooling place to increase the performance and reduce the impeller temperature. It is found that shroud cooling improves the compressor performance the most. Shroud cooling with 2400 W of cooling power increases the pressure ratio by 4.6% and efficiency by 1.49%. Each 500 W increase in the shroud cooling power, increases the efficiency by 0.3%. Diffuser cooling and back plate cooling have an identical effect on the polytropic efficiency. However, back plate cooling increases the pressure ratio more than diffuser cooling. Furthermore, only back plate cooling reduces the impeller temperature, and with 2400 W of cooling power, the impeller temperature reduces by 45 K.
Highlights
Centrifugal compressors generate a high pressure ratio in a small size
The trend in centrifugal compressors is towards a high pressure ratio on a smaller scale
The conjugate heat transfer (CHT) method was used to calculate the temperatures in the solid impeller and the solid casing
Summary
Centrifugal compressors generate a high pressure ratio in a small size. They can be used in areas where a high pressure ratio in a small space is desirable; for example, in compact gas turbines, helicopters and turbochargers. The trend in centrifugal compressors is towards a high pressure ratio on a smaller scale This increases the power density, saves energy and reduces emissions. Higher rotational speed increases the flow speed and Mach number This produces shock waves and degrades the efficiency of the compressor. Inlet wet cooling is a common method in gas turbines to increase the efficiency [7,8]. Cooling power has been varied on each wall, the compressor pressure effect of cooling on each part. Cooling power has been varied on each wall, and the compressor ratio and efficiency, as well as the impeller temperature have been compared. The cooling walls are pressure ratio and efficiency, as well as the impeller temperature have been compared.
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