Collapse analysis of imperfect subsea pipelines based on 2D high-order nonlinear model

Yu, Jianxing; Li, Zhibo; Yang, Yongchun; Sun, Zhenzhou

doi:10.1007/s12209-014-2116-y

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…TEG uses special materials to convert the temperature difference of different heat sources into the potential difference between hot and cold ends (Seebeck effect). The main problem faced by adopting thermoelectric conversion technology to recover exhaust and waste heat of ICE is that the conversion efficiency of the thermoelectric converter is too low, even lower than 4% in high-altitude areas . ORC uses an organic compound with a lower boiling point as the working medium.…”

Section: Introductionmentioning

confidence: 99%

“…The main problem faced by adopting thermoelectric conversion technology to recover exhaust and waste heat of ICE is that the conversion efficiency of the thermoelectric converter is too low, even lower than 4% in high-altitude areas. 13 ORC uses an organic compound with a lower boiling point as the working medium. Similar to the working principle of the traditional Rankine cycle, the working medium circulates in four parts of working medium pump, expander, evaporator, and condenser to convert exhaust waste heat into useful work output.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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 expanding process originally used in onshore pipeline manufacturing may be suitable for deep sea [8]. Yu et al [9] analyzed the influence of crack parameters on the fatigue life of deep-water submarine pipelines and found that pipeline cracks are the main cause of failure accidents. Feng et al [10] theoretically analyzed the anti-collapse performance of submarine pipelines, and the results showed that ovality is an important factor affecting the anti-collapse performance of pipelines.…”

Section: Introductionmentioning

confidence: 99%

Two-Roller Continuous Calibration Process by Compression for Submarine Pipelines

et al. 2021

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Submarine pipeline is a key part in the development of deep sea and ultra-deep sea oil and gas. In order to reduce the ovality of pipes and improve their compressive strength, a two-roller continuous calibration (TRCC) process by compression is proposed. A springback analysis of compress bending is carried out, and an analytical model is established, which predicts ovality after calibration and provides a theoretical basis for roller shape design and process parameter formulation. Numerical simulation and physical experiments are carried out. The distribution of stress and strain is analyzed. The effects of initial ovality, reduction ratio and initial placement angle on the ovality after calibration are studied. When the reduction ratio is about 1%, the ovality is optimal. The theoretical analysis shows that the ovality after calibration is about 0.03%, and the ovality after calibration by numerical simulation and experiment is less than 0.45%, proving the feasibility of the process.

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A modified numerical calculation method of collapse pressure for thick-walled offshore pipelines

Han

Duan

et al. 2019

Applied Ocean Research

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Collapse analysis of imperfect subsea pipelines based on 2D high-order nonlinear model

Cited by 5 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

Two-Roller Continuous Calibration Process by Compression for Submarine Pipelines

A modified numerical calculation method of collapse pressure for thick-walled offshore pipelines

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