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Overview of noise types generated by turbocharger compressor
Paulík, Lukáš ; Novotný, Pavel (referee) ; Vacula, Jiří (advisor)
The bachelor thesis is focused on the analysis of aerodynamic noise coming out of the compressor of turbocharger. The findings concerning the work of a radial compressor in connection with the production of the noise spectrum were overtaken from individual home and foreign publications. Main attention has been focused on the noise generated in the compressor impeller. As a basis for the generation of noise in the compressor, its characteristic and the operating line marked in it are used as a result of the cooperation of the engine with turbocharger. In individual chapters are described the sources of noise generated by, the rotation of the impeller blades, the supersonic current entering the impeller eye, the overflow of air between the blades and the compressor housing, the rotating stall and the surge of the compressor.
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Analysis of the Effects of Internal Recirculation Channel of a Radial Compressor on Extending the Stable Working Area
Paulík, Lukáš ; Vacula, Jiří (referee) ; Novotný, Pavel (advisor)
The extension of the stable working area is very important especially for the radial compressors used in turbochargers. Compressors with high pressure ratio have a narrow stable operating region, which limits their practical use. One of the frequent modifications on radial compressor, concerning the extension of its range of stable work, is installation of an internal recirculation channel (IRC) in its inlet section. CFD programs are often used to simulate the flow through the turbomachines for optimizing the design of the IRC. Based on the extensive research, regarding the flow in the IRC and its location in the inlet of the compressor, suitable variants of its design were selected and applied to a radial compressor of the turbocharger. By simulating the flow in a radial compressor with the IRC, using Ansys CFX software, the compressor performance maps were determined. The best design of the IRC which meets the requirements for extending its stable working area was selected by evaluating the results of the simulations.
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Overview of noise types generated by turbocharger compressor
Paulík, Lukáš ; Novotný, Pavel (referee) ; Vacula, Jiří (advisor)
The bachelor thesis is focused on the analysis of aerodynamic noise coming out of the compressor of turbocharger. The findings concerning the work of a radial compressor in connection with the production of the noise spectrum were overtaken from individual home and foreign publications. Main attention has been focused on the noise generated in the compressor impeller. As a basis for the generation of noise in the compressor, its characteristic and the operating line marked in it are used as a result of the cooperation of the engine with turbocharger. In individual chapters are described the sources of noise generated by, the rotation of the impeller blades, the supersonic current entering the impeller eye, the overflow of air between the blades and the compressor housing, the rotating stall and the surge of the compressor.
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