Under-expanded jets and dispersion in supercritical CO2 releases from a large-scale pipeline

Guo, Xiaolu; Yan, Xingqing; Yu, Jianliang; Zhang, Yongchun; Chen, Shaoyun; Mahgerefteh, H; Martynov, Sergey; Collard, Alexander; Proust, Christophe

doi:10.1016/j.apenergy.2016.09.088

Cited by 44 publications

(31 citation statements)

References 33 publications

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“…A few of these include the injection of gaseous fuel jets in a natural gas engine [1,2] or a supersonic combustor [3,4], discharge of chimney gases into the atmosphere [5,6], and thrust control of rockets and V/STOL aircraft via jets [7,8]. In most of these applications, an overall control of the fluid mechanics of the flow is required to improve the quality of the end process.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristic of highly underexpanded jets from various nozzle geometries

Zhou

Yao

et al. 2017

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Flow characteristic of highly underexpanded jets from various nozzle geometries

Zhou

Yao

et al. 2017

Applied Thermal Engineering

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“…Numerous publications have examined the release behaviour of CO 2 based on both experimental studies and numerical research. We have given a detailed introduction in our recently published works and will therefore not repeat it in this article. Despite numerous studies nowadays, there is not yet a clear understanding of the pressure response and phase transition of the supercritical CO 2 depressurization process after accidental release from a pressurized pipeline.…”

Section: Introductionmentioning

confidence: 99%

“…We performed an experimental study on the pressure response and phase transition of supercritical CO 2 during sudden release to improve the understanding of this process using a large‐scale pipeline with a length of 258 m and an inner diameter of 233 mm from the CO2QUEST project and found that the complex phenomena of pressure undershoot, rebound, or slowdown occurred near the critical region . Moreover, we discussed the phase transitions of CO 2 in the pipeline at different diameters of relief orifices during the release process . Medium‐scale CO 2 release experiments were also performed to focus on the phases in the releases when supercritical and saturation CO 2 were released from a 5‐m pipe connected to a 2‐m 3 spherical vessel.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation on pressure response and phase transition of supercritical carbon dioxide releases from a small‐scale pipeline

Yan

Zhu

et al. 2018

Asia-Pacific J Chem Eng

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The prediction of the pressure response and phase transition in the event of an accidental carbon dioxide (CO 2 ) release from a ruptured pipeline is of significant importance for understanding the depressurization behaviour and hence the fracture behaviour. This article presented a small-scale experimental investigation on the pressure response and phase transition of supercritical CO 2 release from a pressurized pipeline with a relief orifice. High-frequency transducers and thermocouples were used to measure the evolution of CO 2 pressures and temperatures at different locations after release. The results indicated that pressures at different locations decreased nearly synchronously after release. No vapour bubble and pressure rebound generated in larger scale release experiments were found in our small-scale release experiments. The depressurization rate was greatly affected by the phase transition. During the release process, the supercritical CO 2 firstly turned into an unstable gas with a very great depressurization rate, then changed into the gas-liquid phase with a lower depressurization rate, and finally changed into gaseous CO 2 . The larger the relief diameter was, the longer the gas-liquid phase state lasted.

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“…The simulation in [35] for a steady underexpanded nitrogen jet at NPR of 5.60 is set as the base case in the present LES. In particular, the pure nitrogen gas is injected at a stagnation temperature of 360.0 K and a stagnation pressure 0.57 MPa with a sonic speed at the nozzle exit, where the Reynolds number is about Re ∼ 10 5 . Details of flow conditions for the steady jet are summarized in Table 1.…”

Section: Simulation Setupmentioning

confidence: 99%

“…A few of these include injection of gaseous fuel jets in a supersonic combustor [1][2][3], discharge of chimney gases into the atmosphere [4,5], and thrust control of rockets and V/STOL aircraft via jets [6,7]. In most of these applications, an overall control of the fluid mechanics of the flow is desirable to improve the quality of the end process.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of characteristic frequency excited highly underexpanded jets

Fan

Yao

et al. 2017

Aerospace Science and Technology

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A highly underexpanded jet with a nozzle pressure ratio of 5.60 is excited simultaneously by the inherent characteristic frequencies in the steady jet of 14.569 kHz, 37.086 kHz, and 45.695 kHz as well as other two reference frequencies of 1.0 kHz and 40.0 kHz. The flow characteristic of the excited jets is revealed by comparing to the steady jet using large eddy simulation technique. For low-frequency excitation ( f e = 1.0 kHz), the flow and acoustic fields of the forcing jet are similar with the steady jet. However, when the jet is excited by high frequencies, the acoustic source moves to the nozzle exit, and the jet potential core together with the near-field shocks oscillate periodically at the excitation frequency. The excitation at f e = 1.0 kHz increases the mixing area since y/D = 24 from the nozzle exit, which is contrary to the effect of other high frequencies that enhances the mixing in the near-field region but decreases the mixing area since y/D = 18. The peak frequency of the excited jets generally becomes identical to the excitation frequency once being excited, except the f e = 1.0 kHz and f e = 40.0 kHz jets. High-order harmonics of the dominant frequency are observed in the pressure spectrum of jets excited by high frequencies, and the dominant mode turns into the axisymmetric mode from the original helical one accordingly. In particular, forcing the jet with the axisymmetric mode of f e = 14.569 kHz provides the fewest shock cells but the largest amplitude in shock oscillation, the most harmonics in the spectrum, and the largest mixing area within 8 ≤ y/D ≤ 12.

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Under-expanded jets and dispersion in supercritical CO2 releases from a large-scale pipeline

Cited by 44 publications

References 33 publications

Flow characteristic of highly underexpanded jets from various nozzle geometries

Flow characteristic of highly underexpanded jets from various nozzle geometries

An experimental investigation on pressure response and phase transition of supercritical carbon dioxide releases from a small‐scale pipeline

Numerical investigation of characteristic frequency excited highly underexpanded jets

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