Abstract
In actual vehicle operation, the turbocharger turbine operates at various temperatures, inlet, and backpressure conditions, unlike compressors. The flow rate characteristics of the turbine are generally evaluated under certain conditions using an assembled turbocharger with a compressor and a turbine and a hot gas bench from the turbocharger manufacturer. Flow rate characteristics are also presented as the reduced mass flow rate to correct the flow rate characteristics according to the turbine inlet temperature and pressure. Therefore, the turbine mass flow rate seen in many engine development cases and studies—including the analysis of the turbine performance and characteristics, engine model configuration, and matching of the engine and turbocharger—is calculated according to the reduced turbine mass flow rate performance and turbine inlet temperature and pressure obtained through hot gas bench experiments under certain conditions. However, the performance of the reduced turbine mass flow rate is influenced by the compressor power conditions, and additional correction of the reduced turbine mass flow rate is required when the turbine inlet temperature and turbine backpressure differ from the reference test conditions, such as the hot gas bench test conditions. In this study, the effect of the turbine inlet temperature and turbine backpressure on the performance of the reduced turbine mass flow rate were examined based on the power balance relationship between the compressor and turbine of an automotive turbocharger. The principle of its correction is also presented.
Highlights
K). results indicate that the reduced turbine speed and reduced turbine mass flow rate were. These results indicate that the reduced turbine speed and reduced turbine mass flow rate were
These results indicate that the reduced turbine speed and reduced turbine mass flow rate were properly properlycorrected
Study,theoretical theoretical and experimental studies based onestimation the estimation of the reduced mass flow rate according to the turbine inlet temperature have been carried out using two gas benches turbine mass flow rate according to the turbine inlet temperature have been carried out using two with differentwith turbine backpressure conclusions of thisconclusions study are summarized below
Summary
Turbocharged engines have become an important technical solution for improving the fuel economy of vehicles [1]. A VGT (Variable-geometry turbocharger) turbine inlet temperature experiment was carried out in a wider temperature range (305 K to 973 K), and the results of the turbine inlet temperature change were found to affect the evaluation result of the reduced mass flow rate of the turbine [16]. Both studies explain that the changes in the centrifugal force of the gas flow in the turbine housings were the main cause of the performance change. It is hoped that the results of this studyofwill contribute to various turbine-related studies, such as as studies on improving the compatibility experimental results between gas benches, increasing studies on improving the compatibility of experimental results between gas benches, increasing the accuracy of engine models, and expanding the application of low-temperature experiments. the accuracy of engine models, and expanding the application of low-temperature experiments
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