Due to the demand for higher specific power and performance of modern gasoline internal combustion engines, turbocharger compressors are forced to be operated closer to the surge line. Hence, knowledge of the effects leading to this operating boundary becomes even more of interest. Because literature on the influence of the inlet ducting on the surge line is rare, in this study the dependency of the surge line on the intake piping system is investigated based on carefully conducted hot gas test bench measurements. Furthermore, the combined influence of different pipe volumes downstream and upstream of the centrifugal compressor is shown. Possible reasons for the observed results are discussed and in addition, the feasibility of simulating the effect employing an adjusted Greitzer/Theotokatos model is assessed. The goal is to contribute to the development of a model, which allows the quantitative comparison of surge lines measured at different test beds in order to ease the turbocharger matching for engine developers and to estimate the influence of engine packaging on the surge line of turbocharger compressors.
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