This study is motivated that studies and researches for performance improvement by modifications of the relevant parts on the turbine-side are made much, but studies on the performance variation of the turbocharger according to the compressor-side changes, which can directly influence the turbocharger performance, have been found comparatively lacking. In the compressor side, it becomes a question that how the turbocharger performance improvement or changes can be achieved by diffuser area changes especially in the particular attention to the turbocharger efficiency and surging margin, which is considered as one of the most important points to evaluate in a view of performance and stability of operation respectively.
In this paper, a proactive research and actions, such as studying about construction of a turbocharger, each part feature, test procedures and methods, performance analysis criteria and methods and etc. in order to understand the process and a conclusion of this study.
In accordance with the change of the diffuser area results showed a performance of the turbo charger is changed with the trend, in the efficiency and surging margin of the turbocharger also showed the same tendency of pattern. In addition, during studies, the actual test was carried out on one of the test bed in an engine builder, which result has also similar trend and pattern and backed the objective of the study with the recorded data. With the trends of the turbocharger performance changes, the optimized operation condition could be fulfilled at variant operating environments, for example, different engine load, different ambient conditions and so on.
Additionally, it can be expected that the results of study can be widely applied to particular use by combining more sensitive mechanical devices and precise control over the software.