Numerical Modelling and Experimental Validation of Twin-Screw Expanders

Vimalakanthan, Kisorthman; Read, Matthew; Kovačević, Ahmed

doi:10.3390/en13184700

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…to name a few. In the realm of twin screw machines, single and multi-phase screw expanders have been modeled and validated with GT-SUITE [6,7]. However, to the authors' knowledge, this is the first study modeling the thermodynamics in a twin screw pump with the GT-SUITE solver.…”

Section: D Thermodynamic Chamber Modelmentioning

confidence: 99%

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Ramchandran¹,

Rane²,

Kovačević³

et al. 2022

SAE Int. J. Passeng. Veh. Syst.

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Electrification has become less of a catchphrase and increasingly commonplace when discussing today's locomotives. Engineers developing thermal management strategies (both component suppliers and system-level analysts) must be armed with effective tools to design and analyze essential components such as coolant pumps and study their behavior in an actual system. This study focuses on the analysis of twin screw pumps for cooling battery packs in hybrid and battery electric vehicles via three different approaches -experimental measurements, a one-dimensional (1D) thermodynamic chamber model, and a three-dimensional (3D) computational fluid dynamics (CFD) model. Experimental measurements are conducted to quantify the coolant's volume flow rate and the shaft power consumption over a range of operating speeds and pump discharge pressures. While these measurements provide some insight into the overall internal leakages and pumping efficiencies, more comprehensive tests at a higher cost are required to fully understand the detailed thermodynamic processes occurring within the pump. Two computational modeling approaches are presented and extensively validated against these measurements. The 1D chamber model demonstrates a good agreement of all measured quantities at a very low computational cost. It also provides useful information regarding the relative importance of the various leakage paths along with the working processes and pressure pulsations. This makes it an effective tool to quickly analyze operating conditions where test data may not be available and iterate towards improved designs via parametric analysis. 3D CFD yields very good agreement compared to the measured results and provides a more complete picture with greater spatial accuracy that is sacrificed in the 1D approach. However, this is available at a significantly higher computational cost. A combination of both methodologies can guide engineers in designing screw pumps for optimal performance.

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Section: D Thermodynamic Chamber Modelmentioning

confidence: 99%

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Ramchandran¹,

Rane²,

Kovačević³

et al. 2022

SAE Int. J. Passeng. Veh. Syst.

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“…Positive displacement expanders have thus gained popularity recently for small-scale power generation and waste heat recovery applications based on ORC. Experimental investigations of ORC-based power plants using positive displacement expanders of various types such as scroll [15][16][17][18][19], rotary vane [20,21], swash-plate [22], and screw [23][24][25] have been realized of late. As the primary component of the thermal-to-power conversion process of the ORC, the expander plays a vital role in the overall performance of the ORC [26,27].…”

Section: Introductionmentioning

confidence: 99%

An Optimum Design for a Fast-Response Solenoid Valve: Application to a Limaçon Gas Expander

Hossain,

Sultan,

Phung

et al. 2024

Dynamics

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Organic Rankine Cycle (ORC)–based small-scale power plants are becoming a promising instrument in the recent drive to utilize renewable sources and reduce carbon emissions. But the effectiveness of such systems is limited by the low efficiency of gas expanders, which are the main part of an ORC system. Limaçon-based expansion machines with a fast inlet control valve have great prospects as they could potentially offer efficiencies over 50%. However, the lack of a highly reliable and significantly fast control valve is hindering its possible application. In this paper, a push–pull solenoid valve is optimized using a stochastic optimization technique to provide a fast response. The optimization yields about 56–58% improvement in overall valve response. A performance comparison of the initial and optimized valves applied to a limaçon expander thermodynamic model is also presented. Additionally, the sensitivity of the valve towards a changing inlet pressure and expander rotor velocity is analyzed to better understand the effectiveness of the valve and provide clues to overall performance improvement.

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“…The investigations of Stosic 2 and Pascu et al 12 have shown that the use of new techniques for rotors profiling helped to manufacture rotors of complex shapes with tolerances of the order of few microns, which improved efficiencies. Also, a limited number of the previous investigations have been carried out 19,20 to characterise flow leakages using experiments and CFD simulations. The gas pulsations are also a main source of noise within the discharge cavity and have been investigated since 1986 by many authors.…”

Section: Introductionmentioning

confidence: 99%

Turbulent flow development within the discharge cavity of a screw compressor

Nouri

Guerrato

Stošić

et al. 2023

International Journal of Engine Research

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Spatial flow field velocities within the discharge cavity of an optical screw compressor have been measured using LDV and PIV techniques. Angle-resolved velocities were obtained over a time window of 1° at a speed of 1000 rpm, pressure ratio of 1 and temperature of 55°C. Comparison between the LDV and PIV results showed very good agreement and provided a good level of confidence in the presented data. Overall, the flow field results revealed the presence of a complex, turbulent, 3D and vortical flow structure within the discharge cavity. LDV measurements at the exit of the discharge port showed that the inflow into the cavity has two distinct flow features that includes undulated velocity profiles with high gradient during the opening of the port, and uniform jet-like flows during the rest of the time. The energy necessary to create that jet-like flow was from the built-in pressure in the rotors. Turbulence fluctuations were high and followed the mean flow variations with values up to 35% of the mean values during the undulating flow. PIV spatial mean flow measurements showed a uniform axial flow close to bottom of cavity that has been transformed to a stable solid body vortex at the top of the cavity. These measurements within the discharge cavity are made for the first time and they are unique and in great detail that can be used for validation of CFD codes and optimisation of compressors to improve their efficiency for different system applications. Graphical abstract [Formula: see text]

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Numerical Modelling and Experimental Validation of Twin-Screw Expanders

Cited by 8 publications

References 13 publications

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

Computational Modeling of Twin Screw Pumps for Thermal Management Applications

An Optimum Design for a Fast-Response Solenoid Valve: Application to a Limaçon Gas Expander

Turbulent flow development within the discharge cavity of a screw compressor

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