Experimental Study on the Flow Characteristics of Two-Stage Variable Turbines in a Twin-VGT System

Qikai Peng, Zhongjie Zhang (), Guangmeng Zhou, Surong Dong, Xumin Zhao, Han Zhang, Ruilin Liu and Jun Cai
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Qikai Peng: College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Zhongjie Zhang: Military Vehicle Engineering Department, Army Military Transportation University, Tianjin 300161, China
Guangmeng Zhou: Military Vehicle Engineering Department, Army Military Transportation University, Tianjin 300161, China
Surong Dong: Military Vehicle Engineering Department, Army Military Transportation University, Tianjin 300161, China
Xumin Zhao: Military Vehicle Engineering Department, Army Military Transportation University, Tianjin 300161, China
Han Zhang: College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Ruilin Liu: College of Power Engineering, Naval University of Engineering, Wuhan 430033, China
Jun Cai: Jiangsu Kaidi Navigation Control System Limited Company, Wuxi 214161, China

Energies, 2023, vol. 16, issue 23, 1-24

Abstract: The twin variable geometry turbocharger (VGT) System, through efficient use of exhaust energy, maximizes internal combustion engine (ICE) power, reduces exhaust emissions and improves reliability. However, the internal flow characteristics of the twin-VGT system are greatly affected by the environment. To ensure that the two-stage adjustable supercharged internal combustion engine is efficient in all geographical environments and under all operating conditions, it is necessary to conduct in-depth research on the internal flow characteristics of high- and low-pressure turbines. In this paper, an experimental system of the flow characteristics of a double variable-geometry turbocharging (twin-VGT) system is designed and developed. A two-stage variable turbine flow characteristic test was carried out, focusing on the relationship between the initial rotational velocity of high variable-geometry turbocharging (HVGT) and blade opening in low variable-geometry turbocharging (LVGT). The effects of high- and low-pressure variable-geometry turbocharger (VGT) blade opening on available exhaust energy, expansion ratio distribution, blade velocity ratio, compressor power consumption and isentropic efficiency were studied. The results show that when the available energy of exhaust gas is constant, with the increase in HVGT turbine speed, when the LVGT blade opening decreases by 10%, the low-pressure turbine expansion ratio increases by about 0.23.

Keywords: vane adjustment opening; twin-VGT system; experimental system; internal combustion engine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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