Hypersonic Aerodynamics of Blunt Plates in Near-Continuum Regime by Improved Navier–Stokes Model

Ou, Jihui; Chen, Jie

doi:10.2514/1.j059333

Cited by 11 publications

(2 citation statements)

References 39 publications

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“…e mass of particles deposited on the filter membrane is calculated according to the change in oscillation frequency, and then, the mass concentration of particles is calculated according to the flow rate, ambient temperature, and atmospheric pressure. e advantages of this method are that the concentration of particulate matter can be continuously monitored and that the accuracy and real-time performance are very good [8]. A suitable cutter is used to sample the smoke and also measure PM2.5 and PM10.…”

Section: Micro-oscillating Balance Methodmentioning

confidence: 99%

Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Zhang

Hou

2022

Advances in Multimedia

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In order to solve the problem of the continuous online monitoring of the fixed pollution source emission particles, on the basis of the advantages and disadvantages of the comprehensive analysis of the extinction method, the β-ray absorption method, the micro-oscillating balance method, the charge transfer method, and the light scattering method, the particle size distribution and concentration optical detection system based on aerodynamic particle size spectrometer is designed according to the Mie light scattering principle. A high-performance aerodynamic particle size spectrometer is designed using a single-wavelength method to measure the concentration of particulate matter, and the equipment and the detection system are used in the continuous monitoring of particulate matter emitted by thermal power plants and compared with the ES632 equipment. Through the system test, the results show that compared with the ES632 equipment performance, the lowest concentration measured by the design of aerodynamic particle size spectrometer equipment can reach 0.1 mg/m3 with a measurement accuracy of 0.01 mg/m3. Compared with the ES632 equipment, the measurement concentration value is 8% higher, which meets the test requirements.

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Section: Micro-oscillating Balance Methodmentioning

confidence: 99%

Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Zhang

Hou

2022

Advances in Multimedia

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“…Many numerical and theoretical methods can provide the macroscopic information of Knudsen layer ow, e.g., methods of the kinetic theory of gases [25,26], conventional CFD method [27,28], DSMC method [29,30], molecular dynamics (MD) method [21,31], and other derivative methods [19,32]. DSMC and MD can reveal the variations of molecular velocity distribution because they directly simulate molecular motion.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of strong shear nonequilibrium phenomenon and its relaxation mechanism in hypersonic Knudsen layer flows based on the direct simulation Monte Carlo method

Liu

Zhang

Lee

2022

Preprint

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Based on the different flowfield and wall settings, a series of plane Couette flows of rarefied argon gas are simulated by the direct simulation Monte Carlo method, and the relaxation process of shear nonequilibrium has been systematically analyzed. The statistical result of molecular streamwise velocity (vx) shows a qualitatively platform-shaped distribution under the conditions of diffuse-reflection wall, low wall temperature, small wall spacing (roughly within the range of Knudsen layer), and large wall speed and shear rate. The simplified mechanism of this platform-like phenomenon is deduced, which proves that after the collision between two molecules reflected from the different walls (named the dual-wall molecular collision), their vx will be uniformly distributed. Thus, if all reflected molecules occur once dual-wall molecular collision on average, their vx will form the platform-shaped distribution. This conclusion is demonstrated by the verification cases. Similar phenomena can be found in more general flows, such as the hypersonic flow over a flat plate. The nonequilibrium phenomenon in the flat-plate flow can be explained by the equivalent relaxation process of dual-wall molecular collision, which indicates that the platform-like phenomenon is a universal nonequilibrium state in strong-shear rarefied flow, and they share a similar relaxation mechanism. The analysis of this phenomenon will help us to understand and model the relaxation process of hypersonic Knudsen layer flow.

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Rarefied gas effect in hypersonic shear flows

Chen

Zhou

2021

Acta Mech. Sin.

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Hypersonic Aerodynamics of Blunt Plates in Near-Continuum Regime by Improved Navier–Stokes Model

Cited by 11 publications

References 39 publications

Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Detection of Particle Concentration and Particle Size Based on Aerodynamic Particle Size Spectrometer

Numerical study of strong shear nonequilibrium phenomenon and its relaxation mechanism in hypersonic Knudsen layer flows based on the direct simulation Monte Carlo method

Rarefied gas effect in hypersonic shear flows

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