Two-phase free jet model of an atmospheric entrained flow gasifier

Hotz, Christian; Haas, Manuel; Wachter, S.; Fleck, Sabine; Kolb, Thomas

doi:10.1016/j.fuel.2021.121392

Cited by 6 publications

(2 citation statements)

References 48 publications

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“…As the height and diameter of the jet increase, the jet transfers part of its momentum to the incoming fluid, and thus the velocity of the jet gradually decreases. Eventually, all the momentum of the jet disappears in the space fluid [16]. In order to simplify the complex medium motion of well jet flow, subsequent experiments used water flow to replace the well jet fluid.…”

Section: Analysis Of Fluid Jet Flow Movementmentioning

confidence: 99%

Blowout Fluid Velocity Measurement Method based on High-speed Sequence Images

Teng,

Zhang

2024

FCIS

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Given the high-temperature and high-pressure environment after the blowout, the staff usually cannot calculate and analyze various blowout parameters at close range and thus take effective measures to control accidents quickly. In this paper, a blowout fluid velocity measurement method is proposed based on high-speed sequence images, and simulation experiments are conducted. The scene conditions of blowout accidents are simulated and analyzed. On this basis, cameras are adopted to shoot a large number of simulated blowout fluid videos from different angles under outdoor conditions. Afterward, the video is converted into a multi-frame image, and the blowout fluid image feature point detection and extraction model are established based on the orb (oriented fast and rotated brief) algorithm. On the feature points extracted by the model, the gms algorithm is used to match the features of the blowout fluid images in the front and back frames. Additionally, the wrong matching points are eliminated using the ransac (random sample consensus) algorithm, and the obtained feature point pairs are employed into the flow velocity calculation model for flow velocity calculation. The results demonstrate that the measured fluid velocity is more accurate. The method proposed in this study can provide reliable data support for early blowout emergency rescue.

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Section: Analysis Of Fluid Jet Flow Movementmentioning

confidence: 99%

Blowout Fluid Velocity Measurement Method based on High-speed Sequence Images

Teng,

Zhang

2024

FCIS

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“…To guarantee the best possible comparability of the data, the measurement plane was chosen based on the theory of similarity at constant dimensionless ratio z/d eq based on the equivalent diameter d eq of free jet theory [46]. This method is commonly applied for gas flame length calculation and is based on momentum conservation, as described in further detail in Hotz et al [47]. Here, this concept was utilized for two phase free jets emerging from coaxial atomizers, where the equivalent diameter d eq was calculated using Equation ( 8) for each nozzle:…”

Section: Evaluation Of the Relevant Measurement Position For Coaxial ...mentioning

confidence: 99%

Mass Flow Scaling of Gas-Assisted Coaxial Atomizers

2022

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This study aims to derive basic principles for liquid mass flow scaling of gas-assisted coaxial nozzles. Four liquid mass flow steps were investigated in the range of M˙liq = 20–500 kg · h−1, applying four atomizers with similar geometry designed at Weaero= const. High-speed camera and phase Doppler anemometer were utilized to detect the local droplet size distribution. To estimate a reliable measurement plane, a detection method and determination according to the free jet theory was used. The resulting droplet size was analyzed, applying the aerodynamic Weber number, as well as the gas momentum flow. An empirical model was derived out of the measured data, which allows for liquid mass flow scaling when process parameters such as GLR, liquid mass flow, and required Sauter mean diameter are specified. The model was developed as a first step towards liquid mass flow scaling of gas-assisted coaxial atomizers within the investigated range of operating conditions.

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