Numerical simulation of a twin screw expander for performance prediction

Papeš, Iva; Degroote, Joris; Vierendeels, Jan

doi:10.1088/1757-899x/90/1/012059

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…Therefore, methods of numerical simulations and mathematical modeling have become very popular and been widely used. Iva et al 10 built a mathematical model of a twin-screw expander to calculate its performance. The presented coupled model has a higher agreement with the CFD results, and has a faster calculating speed.…”

Section: Introductionmentioning

confidence: 99%

Study on novel cross-axis conical screw rotors with large built-in volume ratio for twin-screw expanders used in energy recovery systems

Wang

Pan

Ren

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The twin-screw expander is widely used in many low-grade energy recovery systems. Its built-in volume ratio has a crucial impact on the system performance. Large built-in volume ratio can expand both the application and scope of the twin-screw expander, and can improve the efficiency of the power generation cycle as well. In this study, a novel pair of intermeshing cross-axis conical twin-screw rotors (CCSRs) with large built-in volume ratio and large expansion ratio for the twin-screw expander was proposed. The conjugate meshing of CCSRs can be achieved by using spherical-sectional profiles. Geometric performance of the proposed CCSRs was studied. Moreover, a thermodynamic model and numerical simulations of the working process of the proposed cross-axis conical twin-screw expander (CCSE) were established, and the working performance and thermodynamic characteristics during the expansion process were analyzed. Study results indicate that the proposed CCSRs exhibit a larger built-in volume ratio, and the corresponding twin-screw expander has a larger expansion ratio than that of the traditional one. The contents will be beneficial to the improvement and development of the twin-screw expander and energy recovery systems.

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Section: Introductionmentioning

confidence: 99%

Study on novel cross-axis conical screw rotors with large built-in volume ratio for twin-screw expanders used in energy recovery systems

Wang

Pan

Ren

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…PRSV and SW EoS were used with the SU2 solver. Papes I. et al (2015) performed dynamic model for an efficiency evaluation of a screw expander. Aungier Redlich-Kwong (ARK) EoS (Aungier (1995)) was used.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the cubic equations of state and different transport properties models for ORC turbines modeling

Sebelev¹,

Smirnov

Kuklina³

et al. 2019

European Conference on Turbomachinery Fluid Dynamics and Hermodynamics

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The present paper focuses on a comparison of cubic equations of state (EoS) with accurate Span-Wagner (SW) EoS. Aungier Redlich-Kwong (ARK) EoS, Soave Redlich-Kwong (SRK) EoS and standard Peng-Robinson (PR) EoS were chosen as the basic EoS implemented into ANSYS CFX commercial solver. Furthermore, modeling of transport properties was also considered. Rigid Non Interacting Sphere (NIS) and Interacting Sphere (IS) viscosity models were chosen for a comparison with REFPROP data. Analytically calculated density and viscosity were compared with the REFPROP values for 1 polar (ethanol) and 2 non-polar (R245fa, MDM) fluids at the first part of the investigation. This part showed no significant difference between compared EoS for the non-polar fluids and slightly lower accuracy of PR EoS for the polar fluid. A significant difference between NIS and IS models was showed.2D CFD simulations of VKI LS-89 cascade were performed for both MDM and MD 4 M siloxanes at the second part. It was showed that a preliminary analysis of the fundamental gasdynamic derivative behavior for isentropic expansion is needed for choosing of an appropriate cubic EoS. The choice of NIS or IS transport models does not show a significant effect on the obtained results.

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“…According to Subiantoro et al, leakage can be one of the main issues for rotary engines, while lubrication and sealing are listed as disadvantages according to Bao and Zhao . Leakage is also a relevant issue for other volumetric expanders . Other thermodynamic irreversibilities related to volumetric expanders include inlet and discharge dynamics, heat losses, oil‐flooded mixing, and filling .…”

Section: Introductionmentioning

confidence: 99%

“…Leakage is also a relevant issue for other volumetric expanders . Other thermodynamic irreversibilities related to volumetric expanders include inlet and discharge dynamics, heat losses, oil‐flooded mixing, and filling . The presence of incorrect inlet pressures being supplied creates undesirable effects in a helical screw expander, called blowdown and blowback, which results in loss of work production .…”

Section: Introductionmentioning

confidence: 99%

“…18,[39][40][41][42][43] Other thermodynamic irreversibilities related to volumetric expanders include inlet and discharge dynamics, 40 heat losses, 41 oil-flooded mixing, 41 and filling. 42,43 The presence of incorrect inlet pressures being supplied creates undesirable effects in a helical screw expander, called blowdown and blowback, which results in loss of work production. 17 Exergy analysis is often applied to determine the performance of a system, 22 but it can also be applied in the form of entropy generation minimisation.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of a novel rotating disk cylinder engine concept for power generation

Roux

Swanepoel

2018

Int J Energy Res

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Summary A new type of engine concept is proposed, namely a rotating disk cylinder engine. Unique secondary rotors with grooves act as guide vanes for a working fluid to power a main rotor with multiple cylindrical pistons. Currently, no literature exists on the proposed device and the modelling thereof. The aim of this paper is to determine the dynamic and thermodynamic behaviour of the machine so that recommendations can be made for further research work. A transient as well as a steady‐state thermodynamic model is developed for an adiabatic expansion process using first and second law analysis with air as ideal gas. The model is compared with experimental results of a piston engine driven by compressed air. Results show that the secondary rotor's angle of rotation is not a linear function of the main rotor's angle of rotation, which suggests a limitation in terms of operating speed. Furthermore, for constant power, the efficiency increases as the inlet pressure and speed decrease, while for constant efficiency, the power increases as the inlet pressure and speed increase. Results show the advantage of using three secondary rotors as it drastically decreases the pressure requirement for a constant torque output. The speed and inlet pressure of the device is, however, limited by the mass and material properties of the rotors as well as the effects of leakage. These limitations have not been considered in this initial analysis of the device and are recommended for future work.

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Numerical simulation of a twin screw expander for performance prediction

Cited by 5 publications

References 9 publications

Study on novel cross-axis conical screw rotors with large built-in volume ratio for twin-screw expanders used in energy recovery systems

Study on novel cross-axis conical screw rotors with large built-in volume ratio for twin-screw expanders used in energy recovery systems

Comparison of the cubic equations of state and different transport properties models for ORC turbines modeling

Analysis of a novel rotating disk cylinder engine concept for power generation

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