Study of polytropic exponent based on high pressure switching expansion reduction

Wang, Xuanyin; Luo, Yuxi; Xu, Zhang

doi:10.1007/s11630-011-0492-3

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…High-pressure gas, as a green energy, is widely applied in aerospace [1][2]. How to miniaturize highpressure compressor becomes an important research field [3][4]. High-pressure gas can be achieved by multistage compression and multistage compressors are often large in volume and weight in industry so far.…”

Section: Introductionmentioning

confidence: 99%

Optimization of swash plate multistage compressor based on dynamics

Liu,

Tong,

Gao

2024

J. Phys.: Conf. Ser.

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The swash plate compressor can provide high-pressure gas through multistage compression using its different cylinders, which is an ideal structure for high-pressure compressor miniaturization. The swash plate multistage compressor (SPMC) with variable sections cylinder and inter-stage cooler is proposed and its complex structure results in complex multi-body dynamics and thermodynamics. To research the dynamic characteristics of SPMC, the dynamic model of SPMC is established, which includes the thermodynamics of compression and inter-stage cooler and the dynamics of all the check valves and pistons. The optimization objective function considering the dynamic characteristics and efficiency is proposed. The constraint conditions and sensitivity of the optimized parameters are studied and the final parameters are achieved through an optimization algorithm. Based on the above work, it can be found that the optimization way has high convergence and accuracy, and the comprehensive performance of SPMC is improved significantly.

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Section: Introductionmentioning

confidence: 99%

Optimization of swash plate multistage compressor based on dynamics

Liu,

Tong,

Gao

2024

J. Phys.: Conf. Ser.

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“…pVTt has been employed as the primary gas flow standard for more than 40 years in many countries such as China, the United States, and Japan [1] . The unique advantages of the pVTt gas flow standard are high accuracy, simple structure, and low maintenance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the pVTt Gas Flow Standard with Active Thermal Compensation

Wenqing¹,

Xu²,

Gaoming³

et al. 2023

Proceedings of the 19th International Flow Measurement Conference 2022 on Flow Measurement - FLOMEKO 2022

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pVTt has been employed as the primary gas flow standard in many countries due to its unique advantages like high accuracy, simple structure, low maintenance, etc. However, its calibration efficiency is relatively low because of the long stabilization time of intake and outtake procedures. To reduce the stabilization time, a novel pVTt gas flow standard with active thermal compensation was proposed. Above all, structure and principle of the new pVTt standard device was introduced. Subsequently, the numerical simulation was performed to investigate the influence of thermal compensation. Finally, experiments were carried out, and results showed that the stabilization time after intake completion could be reduced from ten minutes to one minute,which means calibration efficiency was improved a great deal.

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“…It has been applied to industrial automation, robot driving, compressed air powered vehicles, and even some special industries such as aeronautics, astronautics, and weapons design [3]. Typically, the charging and discharging performance and exergy analysis [4] are based on the equations of state.…”

Section: Introductionmentioning

confidence: 99%

Pneumatic Performance Study of a High Pressure Ejection Device Based on Real Specific Energy and Specific Enthalpy

Ren

Yang

et al. 2014

Entropy

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Abstract:In high-pressure dynamic thermodynamic processes, the pressure is much higher than the air critical pressure, and the temperature can deviate significantly from the Boyle temperature. In such situations, the thermo-physical properties and pneumatic performance can't be described accurately by the ideal gas law. This paper proposes an approach to evaluate the pneumatic performance of a high-pressure air catapult launch system, in which esidual functions are used to compensate the thermal physical property uncertainties of caused by real gas effects. Compared with the Nelson-Obert generalized compressibility charts, the precision of the improved virial equation of state is better than Soave-Redlich-Kwong (S-R-K) and Peng-Robinson (P-R) equations for high pressure air. In this paper, the improved virial equation of state is further used to establish a compressibility factor database which is applied to evaluate real gas effects. The specific residual thermodynamic energy and specific residual enthalpy of the high-pressure air are also derived using the modified corresponding state equation and improved virial equation of state which are truncated to the third virial coefficient. The pneumatic equations are established on the basis of the derived residual functions. The comparison of the numerical results shows that the real gas effects are strong, and the pneumatic performance analysis indicates that the real dynamic thermodynamic process is obviously different from the ideal one.

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Study of polytropic exponent based on high pressure switching expansion reduction

Cited by 9 publications

References 6 publications

Optimization of swash plate multistage compressor based on dynamics

Optimization of swash plate multistage compressor based on dynamics

Investigation of the pVTt Gas Flow Standard with Active Thermal Compensation

Pneumatic Performance Study of a High Pressure Ejection Device Based on Real Specific Energy and Specific Enthalpy

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