&lt;b&gt;Recent Studies on Railway Aerodynamics and Noise&lt;/b&gt;

Nagakura, Kiyoshi

doi:10.2219/rtriqr.61.4_240

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…e light irradiation on particles will be absorbed and scattered; the intensity of scattered light is related to the particle size, concentration, incident light wavelength, and scattering angle. Using scattered light intensity, the concentration and particle size distribution and other parameters can be calculated [10].…”

Section: Light Scattering Methodmentioning

confidence: 99%

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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: Light Scattering Methodmentioning

confidence: 99%

“…In formulas (10) and (11), P (1) n (cos θ) is the Legendre function of order n. e total light intensity is given by…”

Section: Light Scattering 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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Meandering airflows beneath the underbody of a train model including bogie (LES of large-scale flow structure around real-shaped train model)

Nakade

Ido

Kajishima

2021

Transactions of the JSME (In Japanese)

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In this study, a large-eddy simulation (LES) is conducted to investigate meandering airflows generated throughout the underbody of a real-shaped train model in open air. In our previous study, this was shown by an LES of airflows around a simplified train model. The shape of the underbody affects the flow. However, thus far, no systematic analyses that consider bogies have been conducted. Our experimental results qualitatively reproduced the power spectra of lateral velocity fluctuations in the underbody obtained using a 1:8.4-scale train model on a moving belt in a wind tunnel. Results on the effects of various bogie shapes suggested that the meandering flow was primarily affected by the time-averaged profile of streamwise velocity. Thus, the effects of the bogie shape on airflow are considerable. Comparing bogie shapes with and without a side cover, that without a side cover generated meandering airflow with a slightly smaller peak frequency than that with a side cover, and a completely smooth bogie generated no meandering airflows. It was confirmed that this LES was useful as a technical tool to develop measures to reduce meandering airflows around high-speed trains.

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<b>Recent Studies on Railway Aerodynamics and Noise</b>

Cited by 2 publications

References 18 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

Meandering airflows beneath the underbody of a train model including bogie (LES of large-scale flow structure around real-shaped train model)

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