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Intro; Parts of this thesis have been published in the following journal articles:; Supervisorâ#x80;#x99;s Foreword; Acknowledgements; Contents; Symbols; 1 Introduction; 1.1 Motivation; 1.2 Background; 1.3 Main Objectives; 1.4 Approaches to Compute Flow-Induced Noise; 1.4.1 Direct Method; 1.4.2 Integral Method Based on Acoustic Analogy; 1.4.3 Broadband Noise Source Models; 1.4.4 Selected Approach; 1.5 Methodological Objectives; 1.6 Book Outline; References; 2 Methodology for Experimental Validation; 2.1 Introduction; 2.2 Experimental Methodology; 2.2.1 Literature Review
2.2.2 Turbocharger Noise Measurements2.2.3 Selected Methods; 2.2.4 Experimental Apparatus; 2.2.5 Compressor Map; 2.2.6 Discussion on Experiments; 2.3 Numerical Model; 2.4 Validation Methodology; 2.4.1 Global Variables; 2.4.2 Pressure Spectra; 2.4.3 Spectra of Pressure Components; 2.4.4 High Frequency Spectra; 2.5 Conclusions; References; 3 Influence of Tip Clearance on Flow Behavior and Noise Generation; 3.1 Introduction; 3.2 Literature Review; 3.3 Estimation of Actual Tip Clearance; 3.3.1 Thermal and Rotational Deformation; 3.3.2 Eccentricity Due to Shaft Motion
3.4 Tip Clearance Reduction Approach3.5 Comparison of Overall Performance and Acoustic Signatures; 3.5.1 Compressor Performance Variables; 3.5.2 Compressor Acoustic Spectra; 3.6 Flow Field Investigation; 3.7 Conclusions; References; 4 Sensitivity of Compressor Noise Prediction to Numerical Setup; 4.1 Introduction; 4.2 Wheel Rotation Approach; 4.3 Turbulence Models; 4.4 Mesh; 4.5 Solver; 4.6 Time-Step Size; 4.7 Conclusions; References; 5 Compressor Mean Flow Field at Near-Stall Conditions; 5.1 Introduction; 5.2 Literature Review; 5.3 Compressor Global Variables; 5.4 Inlet Duct and Inducer
5.5 Impeller Passages5.6 Diffuser, Volute and Outlet Duct; 5.7 Conclusions; References; 6 Compressor Aerocoustics at Near-Stall Conditions; 6.1 Introduction; 6.2 Literature Review; 6.3 Comparison of Acoustic Signatures; 6.4 Flow Field Investigation; 6.5 Conclusions; References; 7 Concluding Remarks; 7.1 Introduction; 7.2 Summary of Findings and Contributions; 7.2.1 Main Original Contributions; 7.2.2 Other Findings; 7.3 Limitations; 7.4 Suggestions for Future Studies; 7.4.1 Continuation of Research; 7.4.2 Overcoming Thesis Limitations and New Questions Arisen During the Thesis; References
2.2.2 Turbocharger Noise Measurements2.2.3 Selected Methods; 2.2.4 Experimental Apparatus; 2.2.5 Compressor Map; 2.2.6 Discussion on Experiments; 2.3 Numerical Model; 2.4 Validation Methodology; 2.4.1 Global Variables; 2.4.2 Pressure Spectra; 2.4.3 Spectra of Pressure Components; 2.4.4 High Frequency Spectra; 2.5 Conclusions; References; 3 Influence of Tip Clearance on Flow Behavior and Noise Generation; 3.1 Introduction; 3.2 Literature Review; 3.3 Estimation of Actual Tip Clearance; 3.3.1 Thermal and Rotational Deformation; 3.3.2 Eccentricity Due to Shaft Motion
3.4 Tip Clearance Reduction Approach3.5 Comparison of Overall Performance and Acoustic Signatures; 3.5.1 Compressor Performance Variables; 3.5.2 Compressor Acoustic Spectra; 3.6 Flow Field Investigation; 3.7 Conclusions; References; 4 Sensitivity of Compressor Noise Prediction to Numerical Setup; 4.1 Introduction; 4.2 Wheel Rotation Approach; 4.3 Turbulence Models; 4.4 Mesh; 4.5 Solver; 4.6 Time-Step Size; 4.7 Conclusions; References; 5 Compressor Mean Flow Field at Near-Stall Conditions; 5.1 Introduction; 5.2 Literature Review; 5.3 Compressor Global Variables; 5.4 Inlet Duct and Inducer
5.5 Impeller Passages5.6 Diffuser, Volute and Outlet Duct; 5.7 Conclusions; References; 6 Compressor Aerocoustics at Near-Stall Conditions; 6.1 Introduction; 6.2 Literature Review; 6.3 Comparison of Acoustic Signatures; 6.4 Flow Field Investigation; 6.5 Conclusions; References; 7 Concluding Remarks; 7.1 Introduction; 7.2 Summary of Findings and Contributions; 7.2.1 Main Original Contributions; 7.2.2 Other Findings; 7.3 Limitations; 7.4 Suggestions for Future Studies; 7.4.1 Continuation of Research; 7.4.2 Overcoming Thesis Limitations and New Questions Arisen During the Thesis; References