Effect of Nozzle Vane and Rotor Clearance on Performance of Variable Nozzle Turbine

Lei, Xinguo; Li, Renfu; Xi, Zhaojun; Yang, Ce

doi:10.1007/s11630-022-1627-4

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…It was finally concluded that the blade angle has the greatest effect on turbine efficiency. Lei [3] conducted a CFD numerical study of the variation in VNT's (The variable nozzle turbines which is the same as VGS) performance due to the clearance between the nozzle blade and rotor. Several cases differ in gap size, rotation speed, and expansion rate conditions.…”

Section: Introductionmentioning

confidence: 99%

Turbine performance improvement by the multi-objective optimization for variable nozzle vanes of turbocharger

Wang,

Morita,

Sakurai

et al. 2024

J. Phys.: Conf. Ser.

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This paper focuses on improving the turbine efficiency of a variable geometry system (VGS) of turbochargers for internal combustion engines. The study investigates the shape optimization of the turbine nozzle vane and impeller of VGS through a meta-model-assisted multi-objective optimization. The design parameters of the optimal solution were compared with the baseline model for data and internal flow field analysis to explore which parameters have an impact on performance improvement. It was found that the optimized trailing edge angle of the nozzle vanes allows the exhaust airflow to reach the impeller with the minimum traveling path, and it contributes to mitigating the mixing loss of the flow to the impeller blade. The optimized impeller blade angle leads to an increase in torque and a higher turbine efficiency (> 5%) with the narrow opening, also ensuring a high mass flow in the wide opening. This outcome can contribute to the design and development of high-performance and low-emission turbocharger systems by optimizing the performance of turbine design parameters simultaneously.

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Section: Introductionmentioning

confidence: 99%

Turbine performance improvement by the multi-objective optimization for variable nozzle vanes of turbocharger

Wang,

Morita,

Sakurai

et al. 2024

J. Phys.: Conf. Ser.

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An Investigation of the Performance and Internal Flow of Variable Nozzle Turbines with Split Sliding Guide Vanes

Yang

Wang

et al. 2022

Machines

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In order to effectively weaken the leakage flow and shock intensity of traditional “swing” type guide vanes in a variable nozzle turbine, a new flow control device named the “split sliding guide vane” (SSGV) is studied in the present work. Steady and unsteady calculations were carried out on both the SSGV and base model at 10%, 40%, and 100% open positions. The shock test was performed to verify the accuracy of the numerical method. The results showed that at 10%, 40%, and 100% open positions, the leakage flow of the SSGV was 43%, 51%, and 40% of that of the base model, respectively. When 10% open, the turbine efficiency increased by 12%, compared with the base model, since the SSGV could effectively inhibit the clearance leakage flow. Due to the increased distance between the rotor and guide vane, the shock intensity of the SSGV was only 52% of that of the base model when 40% was open. The SSGV could reduce the static pressure loss on the guide vane pressure surface, but for the guide vane suction surface, the static pressure distribution appeared in a “W” shape due to the influence of the vane profile. Finally, the flow in the rotor was studied, which showed that the weakening of the shock and reduction of the clearance leakage flow in the guide vane were also beneficial for the strength of downstream rotor blades.

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Effect of Nozzle Vane and Rotor Clearance on Performance of Variable Nozzle Turbine

Cited by 2 publications

References 23 publications

Turbine performance improvement by the multi-objective optimization for variable nozzle vanes of turbocharger

Turbine performance improvement by the multi-objective optimization for variable nozzle vanes of turbocharger

An Investigation of the Performance and Internal Flow of Variable Nozzle Turbines with Split Sliding Guide Vanes

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