Experimental study of a pneumatic engine with heat supply to improve the overall performance

Fang, Yidong; Lu, Yiji; Yu, Xiaoli; Roskilly, Anthony Paul

doi:10.1016/j.applthermaleng.2018.01.113

Cited by 26 publications

(14 citation statements)

References 30 publications

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“…Therefore, the pneumatic performance and thermo-physical properties need to be described with the real gas hypothesis. However, some previous studies are based on the hypothesis of the ideal gas and adiabatic, and some are considered on the real gas effects without considering the convective heat transfer [ 7 , 8 , 9 ]. Few studies take the real gas effects and the convective heat transfer into consideration at the same time.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Theoretical Modelling of a High-Pressure Pneumatic Catapult Considering Dynamic Leakage and Convection

Ren

Zhong

Yao³

et al. 2020

Entropy

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A high-pressure pneumatic catapult works under extreme boundaries such as high-pressure and rapid change of pressure and temperature, with the features of nonlinearity and gas-solid convection. In the thermodynamics processes, the pressure is much larger than the critical pressure, and the compressibility factor can deviate from the Zeno line significantly. Therefore, the pneumatic performance and thermo-physical properties need to be described with the real gas hypothesis instead of the ideal gas one. It is found that the analytical results based on the ideal gas model overestimate the performance of the catapult, in comparison to the test data. To obtain a theoretical model with dynamic leakage compensation, leakage tests are carried out, and the relationship among the leakage rate, pressure and stroke is fitted. The compressibility factor library of the equation of state for compressed air is established and evaluated by referring it to the Nelson-Obert generalized compressibility charts. Based on the Peng–Robinson equation, a theoretical model of the high-pressure pneumatic catapult is developed, in which the effects of dynamic leakage and the forced convective heat transfer between the gas and the metal wall are taken into account. The results from the theoretical model are consistent with the data from ejection tests. This research presents an approach to study the performance of a high-pressure pneumatic catapult with high precision.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Theoretical Modelling of a High-Pressure Pneumatic Catapult Considering Dynamic Leakage and Convection

Ren

Zhong

Yao³

et al. 2020

Entropy

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show abstract

“…It requires no electrical power input and has been proposed as an alternative power source for hybrid vehicles in which it is employed in conjunction with an internal combustion engine, replacing the electric motor in conventional hybrid vehicles [1][2][3]. Such hybrids can improve thermal efficiency by utilizing waste heat from the engine and extending the operating range of such vehicles when compared to electrical hybrids [4,5]. In addition, there are also initiatives into developing road vehicles that are solely pneumatic-powered [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Torque Characteristics of the Revolving Vane Air Expander

Subiantoro

Ooi

2020

Machines

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The use of compressed air as an alternative source of clean energy requires an air expander to extract work. A new design, known as the revolving vane mechanism, has been proposed in an effort to develop high efficiency rotary machines. This paper provides an in-depth analysis by including the vibration characteristics of the revolving vane air expander to evaluate the steady-state operating output torque. A generic model for describing the revolving vane rotational vibration is first derived and subsequently modified to describe the prototype tested. Measurements show that the output torque is bimodal; arising from a tolerance gap between the vane and its slot during fabrication. This effect was found to be less pronounced at high operating speeds. The model is found to be in good agreement with the measured output torques. Further analysis with the validated model showed that extracting shaft work from the cylinder would result in better performance.

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“…However, the pneumatic engine driven by compressed air suffers from its relatively low efficiency, which is normally lower than 35% although various optimisations have been used. 36–39 Hence, new methods for the conversion of compressed air energy should be explored, among which the hybrid pneumatic combustion engine using air injection boosting (AIB) system might be a potential solution. The working principle of AIB is to use onboard compressed air to additionally supercharge the engine, as a supplementary for that provided by the turbocharging system.…”

Section: Introductionmentioning

confidence: 99%

Study of a hybrid pneumatic-combustion engine under steady-state and transient conditions for transport application

Fang

et al. 2019

International Journal of Engine Research

Self Cite

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In this study, a new form of hybrid pneumatic combustion engine based on compressed air injection boosting is proposed. The hybrid pneumatic combustion engine regenerates the wasted energy during engine brake to improve the engine performance achieving better fuel economy. The mathematic model of the hybrid pneumatic combustion engine including a supercharged engine and the compressed air tank has been established. The steady-state and transient performance of the engine are analysed. Results show that the air injection boosting system can effectively improve the steady-state performance. Under the speed of 1900 r/min and 100% load, the engine torque and power can be increased from 1039 N m, 206.9 kW to 1057 N m, 210 kW by adopting air injection boosting with the injection pressure of 0.5 MPa. Effects of air injection parameters are also studied, showing that better performance can be achieved under higher air tank pressure and larger injection hole diameter. In addition, a transient analysis is completed under the speed of 1100 r/min. The result shows that when air injection boosting is used, the responding time of the engine to an instant load increase can be potentially reduced from 5.5 to 3.5 s under the injection pressure and duration of 0.5 MPa and 3 s. Meanwhile, the tank pressure has limited influence on the transient performance of the engine.

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Experimental study of a pneumatic engine with heat supply to improve the overall performance

Cited by 26 publications

References 30 publications

Experimental Investigation and Theoretical Modelling of a High-Pressure Pneumatic Catapult Considering Dynamic Leakage and Convection

Experimental Investigation and Theoretical Modelling of a High-Pressure Pneumatic Catapult Considering Dynamic Leakage and Convection

Torque Characteristics of the Revolving Vane Air Expander

Study of a hybrid pneumatic-combustion engine under steady-state and transient conditions for transport application

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