CFD analysis of the influence of variable wall thickness on the aerodynamic performance of small scale ORC scroll expanders

Emhardt, Simon; Tian, Guohong; Song, Panpan; Chew, John W.; Wei, Mingshan

doi:10.1016/j.energy.2021.122586

Cited by 15 publications

(6 citation statements)

References 17 publications

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“…The head and tail baselines of the new variable diameter dual circular arc combined profile are composed of an involute of a circle with radius R 1 , while the middle part is replaced by an involute of a circle with radius R 2 . The equations of the first and third baseline segments are the same, as shown in Equation (1). The domain of definition for the first segment is φ ∈ [0, φ 1 ], the domain of definition the third segment is that φ ∈…”

Section: General Control Equation Of the New Variable Diameter Dual C...mentioning

confidence: 99%

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Analysis of Tangential Leakage Flow Characteristics in a Variable Diameter Dual Circular Arc Vortex Compressor

Huang,

Qiu,

Wang

et al. 2024

Applied Sciences

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(1) To address issues such as a low compression ratio and severe leakage in uniform wall thickness vortex compressors, this paper adopts a new scroll compressor model with a variable diameter double arc combined profile, which has a larger pressure ratio and smaller leakage than the scroll compressor with equal wall thickness that can bring new ideas and methods to the research in the field of scroll compressors. (2) This paper determines the theoretical equation of the variable diameter dual circular arc vortex profile and the combined profile, and infers mathematical models for the leakage line length, working chamber volume, and gas leakage per unit rotation angle of the vortex compressor, followed by simulation. (3) The results show that compared to the uniform wall thickness involute profile, the variable diameter dual circular arc combined profile model reduces the leakage line length by 25%, increases the average total pressure at the working chamber outlet by 2.38%, and decreases the leakage amount by 3.2%, consistent with theoretical analysis. (4) The tangential leakage caused by the radial gap in the variable diameter dual circular arc combined profile model has a significant impact on the uneven distribution of temperature and velocity fields in the working chamber of the vortex compressor, but a smaller impact on the pressure field.

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Section: General Control Equation Of the New Variable Diameter Dual C...mentioning

confidence: 99%

“…In the design and optimization of vortex profiles, Emhardt [1] proposed a vortex tooth profile with gradually decreasing wall thickness from the tooth head to the tail. The distribution of various state fields and the stress-strain situation of the vortex teeth were studied using numerical simulation methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Tangential Leakage Flow Characteristics in a Variable Diameter Dual Circular Arc Vortex Compressor

Huang,

Qiu,

Wang

et al. 2024

Applied Sciences

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“…Emhardt et al [78] carried out unsteady-state and three-dimensional computational fluid dynamics simulations on a pair of scroll expanders with variable wall thickness to examine the impact of geometry on internal flow characteristics. Additionally, Emhardt et al [79] conducted CFD analyses of small ORC scroll expanders using both variable and constant wall thicknesses, as depicted in Figure 5. These investigations highlight the potential of variable wall thickness to improve scroll compressor performance, underscoring the importance of further exploring this design approach.…”

Section: Electric Compressormentioning

confidence: 99%

Review of Thermal Management Technology for Electric Vehicles

et al. 2023

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The burgeoning electric vehicle industry has become a crucial player in tackling environmental pollution and addressing oil scarcity. As these vehicles continue to advance, effective thermal management systems are essential to ensure battery safety, optimize energy utilization, and prolong vehicle lifespan. This paper presents an exhaustive review of diverse thermal management approaches at both the component and system levels, focusing on electric vehicle air conditioning systems, battery thermal management systems, and motor thermal management systems. In each subsystem, an advanced heat transfer process with phase change is recommended to dissipate the heat or directly cool the target. Moreover, the review suggested that a comprehensive integration of AC systems, battery thermal management systems, and motor thermal management systems is inevitable and is expected to maximize energy utilization efficiency. The challenges and limitations of existing thermal management systems, including system integration, control algorithms, performance balance, and cost estimation, are discussed, along with potential avenues for future research. This paper is expected to serve as a valuable reference for forthcoming research.

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“…It was found that scroll expanders with scrolls of variable wall thicknesses allow for the increase of the geometric expansion ratio without increasing the length of the scroll profiles, and thus avoiding the decrease in efficiency typical of constant wall thickness profiles; this feature is particularly useful for ORC systems as well as for refrigeration cycles and other power cycles where a high-pressure ratio enables higher performances. The same authors extensively studied the positive effects of a variable wall thickness scroll in [19,29,30] using a CFD modeling approach.…”

Section: Design and Technological Improvement Of Scroll Expandersmentioning

confidence: 99%

Feasibility Assessment of a Dual Intake-Port Scroll Expander Operating in an ORC-Based Power Unit

2022

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The main driver of research in the road transportation sector is almost certainly the development of technologies which allow for the reduction of CO2 emissions from internal combustion engines (ICEs). Wasted heat recovery (WHR) from the exhaust gases of ICEs based on organic rankine cycle (ORC) power units is one of the most promising technological solutions. However, several issues are raised when the recovery unit is scaled down to small applications, not to mention the fact that thermal sources are characterized by their intrinsically transient nature, as is the case with ICEs. In fact, this leads the ORC unit having to work frequently in off-design conditions. To successfully overcome this issue, the proper design and selection of the expanders are crucial. They are generally chosen from volumetric-type machines, thanks to their capacity to deal with time-varying thermo-fluid dynamic inlet properties. Among them, scroll machines represent one of the best solutions, despite them not yet being optimized as expanders, with them having been studied more as compressors. Dual-intake-port (DIP) technology is a novel solution used to enhance the performance of scroll machines. The effectiveness of this technology was assessed thanks to a comprehensive, experimentally-validated theoretical model of the scroll. It demonstrated that DIP technology can produce a 25% increase in mechanical power with respect to the baseline machine, without modifying the in–out pressure ratio. Maintaining a constant pressure difference across the expander at 5.6 bar, the power grew from 1131 W to 1410 W with the adoption of DIP technology. This power boost is lower than that achieved with a comparable DIP sliding rotary vane expander (SVRE) already studied by the authors, but the DIP Scroll achieved a higher efficiency (50–60%) when compared to the DIP SVRE case (40%).

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CFD analysis of the influence of variable wall thickness on the aerodynamic performance of small scale ORC scroll expanders

Cited by 15 publications

References 17 publications

Analysis of Tangential Leakage Flow Characteristics in a Variable Diameter Dual Circular Arc Vortex Compressor

Analysis of Tangential Leakage Flow Characteristics in a Variable Diameter Dual Circular Arc Vortex Compressor

Review of Thermal Management Technology for Electric Vehicles

Feasibility Assessment of a Dual Intake-Port Scroll Expander Operating in an ORC-Based Power Unit

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