Effects of suction port arrangements on a scroll expander for a small scale ORC system based on CFD approach

Song, Panpan; Wei, Mingshan; Liu, Zhen; Zhao, Ben

doi:10.1016/j.apenergy.2015.04.046

Cited by 56 publications

(29 citation statements)

References 25 publications

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“…The dynamic mesh technology provided by ANSYS FLUENT [32] was employed to generate the eccentric movement of the orbiting scroll relative to the fixed scroll while changing the enclosed working chamber volumes over time. The dynamic mesh is the most common approach to capture the fluid motion in the complex scroll expander geometry and to reproduce the eccentric movement of the orbiting scroll by means of user-defined functions [12,24,[26][27][28]33,34]. The smoothing and remeshing dynamic mesh schemes were combined and enabled in order to regenerate and recalculate the deforming and moving mesh in the expander working chambers at each time step.…”

Section: Grid Generationmentioning

confidence: 99%

“…CFD simulations of scroll machines have been increasingly conducted in recent years for investigation of the inner working process [12,[23][24][25][26][27][28]. The understanding developed has contributed to performance predictions which are useful for preliminary design and the further improvement of the scroll geometry itself.…”

Section: Introductionmentioning

confidence: 99%

“…This would enable the capture of spatial inner flow characteristics, evaluation of accurate time-averaged flow and temperature fields and consideration of the effects of lubricating oil. Drawing upon these findings, Song et al ( ,2018 [26][27][28] established a 3D CFD model to analyse the inner working process of a scroll expander with a particular focus on the unsteady suction process and the effects of suction port arrangements. They also developed a CFD model for a small-scale ORC scroll expander with a bilateral discharge structure (two discharge ports) to investigate its influence on the expander aerodynamic performance.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

Emhardt

Tian

Song

et al. 2020

Energy

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Section: Grid Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

Emhardt

Tian

Song

et al. 2020

Energy

Self Cite

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“…Vortices form in the cylinder, and they change with inlet valve opening degree and piston displacement during the intake process. Vortex flow converts pressure energy and kinetic energy into thermodynamic energy for the working fluid, which weakens the power capacity of the working fluid within a certain period [40,41]. Several practical approaches should be adopted to adjust the intake flow and reduce the energy losses caused by large-scale vortex flow, and thus, improve the energy conversion efficiency of the FPE.…”

Section: Unsteady Flow Behavior During the Intake And Exhaust Processesmentioning

confidence: 99%

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Zhang

Yang

et al. 2016

Energies

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Abstract:A novel free piston expander-linear generator (FPE-LG) integrated unit was proposed to recover waste heat efficiently from vehicle engine. This integrated unit can be used in a small-scale Organic Rankine Cycle (ORC) system and can directly convert the thermodynamic energy of working fluid into electric energy. The conceptual design of the free piston expander (FPE) was introduced and discussed. A cam plate and the corresponding valve train were used to control the inlet and outlet valve timing of the FPE. The working principle of the FPE-LG was proven to be feasible using an air test rig. The indicated efficiency of the FPE was obtained from the p-V indicator diagram. The dynamic characteristics of the in-cylinder flow field during the intake and exhaust processes of the FPE were analyzed based on Fluent software and 3D numerical simulation models using a computation fluid dynamics method. Results show that the indicated efficiency of the FPE can reach 66.2% and the maximal electric power output of the FPE-LG can reach 22.7 W when the working frequency is 3 Hz and intake pressure is 0.2 MPa. Two large-scale vortices are formed during the intake process because of the non-uniform distribution of velocity and pressure. The vortex flow will convert pressure energy and kinetic energy into thermodynamic energy for the working fluid, which weakens the power capacity of the working fluid.

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“…The simulation results showed that the exhaust on the shell side flowed primarily parallel with the fin layers. Song et al [29] performed 3D numerical simulations on scroll expanders with different suction port locations to estimate transient features of the aerodynamic parameters including pulsating mass flow rate through the suction port, asymmetric distributions of the internal flow, gas forces and moments exerted on the orbiting scroll. The results illustrated the pulsating features of the suction mass flow rate, in response to both variations of the suction flow area and the suction chamber volume, changed obviously for expanders with different suction port locations.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

et al. 2017

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Abstract:The organic Rankine cycle (ORC) can be used to recover the waste heat from a stationary compressed natural gas (CNG) engine. However, the exhaust energy rate varies with engine load, which can influence the operating performance of the ORC system, therefore, it is necessary to study the running state of the ORC system. In this paper, first, the numerical simulation model of the ORC system is built by using GT-Suite software, with R245fa selected as the working fluid of the ORC system. The boundary conditions of the numerical simulation model are specified according to the measured data obtained by the stationary CNG engine test. Subsequently, the power output and dynamic characteristics of expander are analyzed to determine the running state of the ORC system. Investigations indicate that the fluctuation of refrigerant mass flow rate in the expander is obvious in the engine's low-load regions (from 20% engine load to 40% engine load). The performances of ORC system and stationary CNG engine-ORC combined system (combined system) are finally investigated, respectively. The results show that the thermal efficiency of the combined system can be increased by a maximum 5.0% (at the engine rated condition), while the brake specific fuel consumption (BSFC) can be reduced by a maximum 4.0% (at the engine rated condition).

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Effects of suction port arrangements on a scroll expander for a small scale ORC system based on CFD approach

Cited by 56 publications

References 25 publications

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

CFD modelling of small scale ORC scroll expanders using variable wall thicknesses

Preliminary Development of a Free Piston Expander–Linear Generator for Small-Scale Organic Rankine Cycle (ORC) Waste Heat Recovery System

Simulation and Performance Analysis of Organic Rankine Systems for Stationary Compressed Natural Gas Engine

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