Using Tip Gaps on Tandem Diffuser to Broaden the Operation Range of a Centrifugal Compressor

Fang, Junyi; Ji, Chunjun; Li, Chunyang; Sun, Qi

doi:10.1007/s11630-021-1436-1

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Fang and Ji 131 found that with a 2.5% tip clearance ratio the compressor surge margin increased from 33.28% to 49.2%, the stability margin increased from 44% to 60.5%, the pressure ratio loss was 1.16%, and the efficiency loss was 1.14%. Li and Hu 132 found that an increase of 0.1 mm in the gap at the top of the leaf reduces the pressure ratio by about 3% and the efficiency by about 2%.…”

Section: Research Status Of Variable-altitude Turbocharging Systemsmentioning

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: Research Status Of Variable-altitude Turbocharging Systemsmentioning

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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“…However, due to manufacturability issues and assembly tolerances, it is known that the diffuser may have a clearance. This impacts the aerodynamic performance, even though industrial experience and literature show that small gaps can even be beneficial for the performance and stability of the diffuser [4]. Suppression of the suction side flow separation can be for example achieved using grove at low solidity blade leading tip [5].…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical investigation on the impact of tip gap on the performance of vaned diffuser for industrial centrifugal compressors

Baroni,

Romani,

Catalani

et al. 2023

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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Ideally, vaned diffusers should not present any gap between the blade tip and the casing. However, manufacturability issues and assembly tolerances may create a clearance. This affects aerodynamic performance, although industrial experience and recent literature show that a small gap on blades' tip can even be beneficial for performance and stability of the diffuser. To verify this hypothesis, this study presents the results of an experimental campaign carried out using the innovative test rig of the University of Florence. A smart way of setting and verifying the tip gap is first presented. An industrial model stage is then tested under various operating conditions, assessing gap effect. Moreover, an in-depth CFD study of the flow field at the blade tip region was made to understand local phenomena. The study proves that a null gap is not strictly mandatory in industrial installations, thus paving the way for new design and verification strategies.

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Using Tip Gaps on Tandem Diffuser to Broaden the Operation Range of a Centrifugal Compressor

Cited by 2 publications

References 9 publications

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

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

An experimental and numerical investigation on the impact of tip gap on the performance of vaned diffuser for industrial centrifugal compressors

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