Literature review: Present state and future trends of air-powered vehicles

Shi, Yan; Li, Fengyun; Cai, Maolin; Yu, Qihui

doi:10.1063/1.4944970

Cited by 20 publications

(11 citation statements)

References 60 publications

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“…Compressed air, as an energy medium, has some distinct benefits for its zero CO2 emission and convenience in storage, transportation, and conversion [2,3]. Compressed air has found vast applications in fields such as electricity generation, vehicle engines and energy storage technologies [4][5][6]. Among them the compressed air engine (CAE) has a direct and common connection with human society and life and so, it attracts substantial attention [7,8].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a four-stroke compressed air engine

Zeng

2020

THERM SCI

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The purpose of this paper is to investigate working performance for a four-stroke compressed air engine via numerical studies. A mathematical model is developed to study the influence of several operative parameters on working performance. The mathematical model consists of thermodynamic model, each stroke model and dynamic model. In addition, a working principle and an experimental system of the compressed air engine are set up. The aims are: to introduce the novel four-stroke engine and to quantify the influence of rotational speed, supply pressure and supply temperature on working characteristics. The simulation and analysis show several meaningful results. The compressed air engine has higher cylinder pressure and work efficiency in lower speed stage, and the increase of the supply pressure can effectively improve indicated work and work efficiency. However, supply temperature has little effect on the performance of the compressed air engine. Therefore, the study of this work will provide a certain guidance function for further study on optimizing design of the compressed air engine.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of a four-stroke compressed air engine

Zeng

2020

THERM SCI

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“…Compressed air, as the second by importance energy medium in after electricity, is considered to drive a compressed air engine (CAE) because it is clean and inexhaustible [11]. Nowadays, in the field of the CAE, the relevant technologies have been researched by many domestic and foreign scholars [12][13][14][15], and there are many related literatures studying the CAE in the past several decades. These literatures focus on two main aspects: one is the feasibility analysis of the CAE and the other is the working process analysis of the CAE.…”

Section: Introductionmentioning

confidence: 99%

Study on exergy analysis of a compressed air engine

Zeng¹,

Xu²

2018

Therm sci

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In order to reduce exergy loss and optimize exergy efficiency of a compressed air engine (CAE), a theoretical exergy analysis model of the CAE is proposed and a working principle of the CAE based on a conventional IC engine is described. In addition, exergy balance equations of the working process at different stages are setup. The effects of rotational speed, supply pressure and ambient temperature are revealed in the simulation analysis, which have important influences on the exergy efficiency of the CAE. All these analyses of this paper will provide a theoretical basis for further study on optimizing design of the CAE.

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“…Construction machinery, especially the hydraulic excavator (HE), is widely used in transport and infrastructure, which can output a larger amount of power and consume a larger proportion of energy. Therefore, the energy saving and regeneration become the research hotspot to reduce the energy consumption and emissions [1][2][3][4][5]. The energy loss of the hydraulic system can be divided into two types: throttling loss and overflow loss.…”

Section: Introductionmentioning

confidence: 99%

Energy Regeneration Hydraulic System via a Relief Valve with Energy Regeneration Unit

et al. 2017

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Featured Application: This research aims to reduce the energy loss through the relief valve, especially in the systems where the system pressure is high or the overflow flow rate is large.Abstract: Relief valves are widely used in industrial machinery. Due to the outlet of the relief valve being connected to the tank, the pressure drop of the relief valve is frequently equal to the inlet pressure. Accordingly, the energy loss of the relief valve is very high in some cases and this will worsen with an increase in the rated pressure of the hydraulic system. In order to overcome the disadvantage of overflow energy loss in a relief valve, a hydraulic energy regeneration unit (HERU) is connected to the outlet of the relief valve to decrease the pressure drop between the inlet and outlet of the relief valve. The overflow loss, which is characterized by the pressure drop, can be reduced accordingly. The approach is to convert the overflow energy loss in hydraulic form and allow for release when needed. The configuration and working principle of the relief valve with HERU is introduced in this present study. The mathematical model is established to obtain the factors influencing the stability of the relief valve. The working pressure of the hydraulic accumulator (HA) is explored. Furthermore, the control process of the operating state of the HA is scheduled to decide whether to regenerate the energy via the HERU. The software AMESim is utilized to analyze the performance and characteristics of the relief valve with HERU. Following this, the test rig is built and used to verify the effectiveness of the proposed relief valve with HERU. The experimental results show that the relief valve with the HERU connected to its outlet can still achieve better pressure-regulating characteristics. The energy regeneration efficiency saved by the HA is up to 83.6%, with a higher pre-charge pressure of the HA. This indicates that the proposed structure of the relief valve with HERU can achieve a better performance and higher regeneration efficiency.

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Literature review: Present state and future trends of air-powered vehicles

Cited by 20 publications

References 60 publications

Performance analysis of a four-stroke compressed air engine

Performance analysis of a four-stroke compressed air engine

Study on exergy analysis of a compressed air engine

Energy Regeneration Hydraulic System via a Relief Valve with Energy Regeneration Unit

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