Potentials of External Exhaust Gas Recirculation and Water Injection for the Improvement in Fuel Economy of a Poppet Valve 2-Stroke Gasoline Engine Equipped with a Two-Stage Serial Charging System

Fu, Xue-Qing; He, Bang-Quan; Xu, Si-Peng; Zhao, Hua

doi:10.4271/2018-01-0859

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…TST can provide a high pressure ratio and wide flow rate and effectively improve diesel engine intake pressure at high altitude. However, the matching condition is fixed, the adaptability to changing condition is insufficient, and the low-speed torque is insufficient. , EC2T can eliminate turbine hysteresis and precisely control the boost pressure according to the change of internal combustion engine working conditions and altitude, which is a potential variable altitude adaptive supercharging system. However, there are some problems, such as insufficient motor speed, severe vibration of supercharger bearing, poor reliability of motor subjected to high exhaust temperatures, and insufficient acceleration potential of the motor under varying working conditions.…”

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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“…The arrangement of turbocharger and supercharger varies among studies. Fu et al [23] numerically studied the potential of external exhaust gas recirculation and water injection to suppress knocking combustion and improve fuel economy of a boosted 2-stroke gasoline engine with a mechanical supercharger upstream the turbocharger at upper loads. In contrary, Mattarelli [24] found that the 3-cylinder, 1.0 liter 2-stroke engine with the mechanical supercharger downstream the turbocharger can reach superior specific power up to 113 HP/l and has higher values of torque at any speed compared to a 4-stroke counterpart.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Boost System for a High Performance 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine

Wang¹,

Zhao²

2020

SAE Technical Paper Series

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A 2-stroke boosted uniflow scavenged direct injection gasoline (BUSDIG) engine was researched and developed at Brunel University London to achieve higher power-to-mass ratio and thermal efficiency. In the BUSDIG engine concept, the intake scavenge ports are integrated to the cylinder liner and controlled by the movement of piston top while exhaust valves are placed in the cylinder head. Systematic studies on scavenging ports, intake plenum, piston design, valve opening profiles and fuel injection strategies have been performed to investigate and optimise the scavenging performance and in-cylinder fuel/air mixing process for optimised combustion process. In order to achieve superior power performance with higher thermal efficiency, the evaluation and optimisation of the boost system for a 1.0 L 2-cylinder 2-stroke BUSDIG engine were performed in this study using one dimensional (1D) engine simulations. The results show that the engine exhaust valve opening (EVO) timing and exhaust duration (ED) are key parameters affecting the engine performance with the single-stage turbocharging (T). By using an earlier EVO timing of 80 ⁰CA and a longer ED of 140 ⁰CA, a maximum brake power of 130.7 kW could be achieved at 3200 rpm and peak torque output of 488 N*m at 1600 rpm. Simulations were also performed to evaluate the engine performance with combined boost systems with a supercharger upstream the turbocharger (S-T) and a turbocharger upstream the supercharger (T-S). The results indicate that the combined boost systems increase both engine power and torque compared to the single-stage turbocharging system. In particular, the peak brake power and torque of the 1.0 L BUSDIG engine could reach 143.7 kW at 4000 rpm and 492 N*m at 800 rpm with the S-T setup.

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A review of water injection application on spark-ignition engines

Wan

Zhuang

Huang

et al. 2021

Fuel Processing Technology

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Potentials of External Exhaust Gas Recirculation and Water Injection for the Improvement in Fuel Economy of a Poppet Valve 2-Stroke Gasoline Engine Equipped with a Two-Stage Serial Charging System

Cited by 6 publications

References 35 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

Analysis of the Boost System for a High Performance 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine

A review of water injection application on spark-ignition engines

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