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Self recirculation casing treatment has been showed to be an effective technique to extend the flow range of the compressor. However, the mechanism of its surge extension on turbocharger compressor is less understood. Investigation and comparison of internal flow filed will help to understand its impact on the compressor performance. In present study, experimentally validated CFD analysis was employed to study the mechanism of surge extension on the turbocharger compressor. Firstly a turbocharger compressor with replaceable inserts near the shroud of the impeller inlet was designed so that the overall performance of the compressor with and without self recirculation casing treatment could be tested and compared. Two different self recirculation casing treatments had been tested: one is conventional self recirculation casing treatment and the other one has deswirl vanes inside the casing treatment passage.

The prevalence of turbocharged engines in passenger car applications has been increasing rapidly, particularly in the past decade or so. The tightening of emissions requirements and goals for engine downsizing has significantly increased the demand on turbocharger compressor stable operating ranges and efficiency levels, for both diesel and gasoline engines. The operability limits of single-stage turbocharger centrifugal compressors are being severely tested, and customization of some key aerodynamic technologies is required to meet the challenge. This paper addresses some critical design challenges in wide-operability, single-stage turbocharger compressors for advanced automotive diesel engine applications. Starting with a few technological ground rules, a brief exploration of the design space for two notional advanced engine operating lines is presented.