Simulation of single acting natural gas Reciprocating Expansion Engine based on ideal gas model

Farzaneh–Gord, Mahmood; Jannatabadi, Mohsen

doi:10.1016/j.jngse.2014.09.031

Cited by 21 publications

(3 citation statements)

References 5 publications

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“…Runge-Kutta method was applied to solve the above-mentioned model and MATLAB was adopted to implement the simulation. Refer to published references 10,28,30,32,33 , experimental devices based on single-stage compression principle were built to verify our mathematical models. As shown in Figure 4, a crank connecting rod was used to drive the reciprocating motion of the piston and its rotation speed can be controlled by an AC motor.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Deng

Jiang

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Miniature high pressure compressor (MHPC) is key component of continuous gas supply system in aircraft for missile launching and infrared cooling. Valve design makes a crucial role in reciprocating compressors and traditional valves in high-pressure reciprocating compressors usually occupy a large space, have relative larger clearance volume and spring stiffness, which are incompetent to be applied to MHPC. In this study, integrated reed valves with four cantilevers on a steel plate are proposed to serve as the suction valves and discharge valves in MHPC. By this method, the number of valve parts and the axial dimension can be greatly reduced. Theoretical research has been carried out to reveal the dynamic characteristics of the proposed integrated valves. Numerical methods based on equivalent model of cantilever valve are proposed to improve the calculating efficiency compared to traditional CFD method. The equivalent stiffness and equivalent mass for valve motion equations have been calculated and plugged into the whole mathematical models. Based on the optimized valve parameters, experimental investigation on MHPC has been carried out.

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Section: Mathematical Modellingmentioning

confidence: 99%

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Deng

Jiang

Liu

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…The gas medium is always assumed to be the ideal gas in many studies to simplify the calculation (Gord & Jannatabadi, 2014), and the governing equation is as follows:…”

Section: Ideal Gas Modelmentioning

confidence: 99%

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Zhang

2020

Engineering Applications of Computational Fluid Mechanics

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Instantaneous gas-liquid flow and distribution have an important influence on the performance of a multiphase pump, especially under the high gas content conditions. How to accurately simulate the complete working cycle of a multiphase pump and reflect the transient oil-gas flow inside the pump cavity are the main difficulties of the study. A three-dimensional whole-cycle numerical simulation has been conducted to predict the void fraction waves of the reciprocating multiphase pumps under the high gas rates and to evaluate the effects of multi-case parameters on its pulsation characteristics. The instantaneous two-phase distribution and fluctuation characteristic accompanying the movement of the piston and the valves during each process of the multiphase pump are innovatively obtained under the high gas rates. Five different ideal gas model and real gas models used in this simulation are compared and optimized first, and then validated by the experimental results. Void fraction wave signals in the time and frequency domains are obtained from multiple working cycles of the multiphase pump, and the pulsation rates, propagation speeds, amplitudes, and power spectral densities are analyzed in great detail under different inlet gas contents, pressure ratios, crank speeds, and stroke lengths.

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“…where V cl is the clearance volume and D c is the cylinder diameter; subscript c represents the compressor cylinder. The first thermodynamic law over a control volume is given by [36]:…”

Section: Thermodynamic Modelmentioning

confidence: 99%

Analysis of Pressure Pulsation Influence on Compressed Natural Gas (CNG) Compressor Performance for Ideal and Real Gas Models

et al. 2019

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This work investigates the effects of pressure pulsations on reciprocating natural gas compressor performance thermodynamically. A nonlinear hybrid numerical model is thus developed to consider the interaction between the compressor and the pipeline system. The suction chamber, compressor cylinder and discharge chamber are modelled integrally based on the first law of thermodynamics and mass balance, and the pipeline flow is described by using the gas dynamic model. Methane is considered as the working fluid and its properties are computed based on ideal and real gas assumptions. For the real gas model, the methane properties are obtained by means of calling the NIST REFPROP database. The validity of numerical results is confirmed by previous experimental values. Results from the examinations of pressure pulsation influence demonstrate that discharge resonance requires more specific work than suction resonance in the same harmonic; in the suction system, the first harmonic response reduces the mass flow rate but significantly increases specific work, and the second harmonic response has a strong supercharging effect but the specific work is increased slightly; in the discharge system, the mass flow rate is changed little by pressure pulsations, but the indicated power and specific work are increased significantly; for the real gas model, the in-cylinder temperature during the compression and discharge phases, mass flow rate and indicated power are higher than those for the ideal gas model, whereas the specific work is less for the real gas model than for the ideal gas model.

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Simulation of single acting natural gas Reciprocating Expansion Engine based on ideal gas model

Cited by 21 publications

References 5 publications

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Integrated reed valves applicable to miniature high pressure compressor and investigation on their dynamic characteristics based on equivalent model

Numerical study on void fraction wave of reciprocating multiphase pumps with high gas rates based on real gas models

Analysis of Pressure Pulsation Influence on Compressed Natural Gas (CNG) Compressor Performance for Ideal and Real Gas Models

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