The effects of stator-rotor interaction on unsteady characteristics of turbine tip leakage flow

Wang, Tianyi; Xuan, Yimin; Han, Xingsi

doi:10.1016/j.ast.2023.108544

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…The generation of any one phenomenon within a compressor involves multiple processes and is a nonconstant flow of a complex viscous compressible fluid. 129,130 Scholars at home and abroad have performed relevant studies on the internal flow field of turbocharger turbines. As the altitude rises, the compressor inlet Reynolds number crosses from the self-mode region to the non-selfmode region, and the two-stage compressor isentropic efficiency will be affected by the combined effects of ambient temperature, pressure, and Reynolds number.…”

Section: Analysis Of the Internal Flowmentioning

confidence: 99%

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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The increase in altitude causes the decrease in internal combustion engine power and the increase in pollutant emission. Converting waste heat into more useful forms of energy through the recovery of waste heat from internal combustion engines is the most promising mechanism for improving both of these goals. This paper comprehensively reviews the development and research of waste heat recovery technology of an internal combustion engine in a variable altitude environment. It is found that exhaust gas turbocharging is the most promising waste heat recovery technology to restore high-altitude internal combustion engine power. Turbochargers are affected by low temperature and low pressure at high altitudes, resulting in poor environmental adaptability, inadequate supercharging ratios, and decreased supercharging efficiency. Therefore, it is very important to select the high pressurization system facing the plateau area and its reasonable matching characteristics. The quality of exhaust energy determines how much waste heat a turbine can recover, and only the exergy part of exhaust energy can realize heat/work conversion. The main disadvantage of turbocharging technology applied in the plateau area is that the speed ratio deviates from the design value, leading to the increase of flow loss inside the supercharger. Therefore, optimizing the internal flow field of a high-altitude supercharger is a key problem to improve the efficiency of energy recovery. The conclusion drawn from this Review is that a two-stage turbocharging system will be a key technology to improve the thermal efficiency and reduce the fuel consumption of high-altitude internal combustion engines in the coming decades. In addition, the efficient utilization of the exhaust energy of the two-stage turbine and the influence of the variable compression process of the two-stage compressor on the working medium in the cylinder will be the focus of future research.

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Section: Analysis Of the Internal Flowmentioning

confidence: 99%