Investigation of laminar-turbulent transition of supersonic boundary layer by scanning constant temperature hot-wire anemometer

Yatskikh, A. A.; Kosinov, A. D.; Семёнов, Н. В.; Smorodsky, B. V.; Ermolaev, Yu. G.; Kolosov, G. L.

doi:10.1063/1.5065315

Cited by 27 publications

(5 citation statements)

References 9 publications

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“…A tungsten wire of 10 μm in diameter and 1.7 mm in length was used. The overheat rate of the hot-wire probe was set to 0.7-0.8, and it means that the measured disturbances up to 95% consisted of mass flow fluctuations (m′) [22][23][24]. The dc output voltage (E) of the anemometer was measured with an Agilent 34401A digital voltmeter.…”

Section: Problem Statement Numerical Methods and Experimental Setupmentioning

confidence: 99%

Experimental and numerical investigation of controlled disturbances development from two sources in supersonic boundary layer

et al. 2019

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The paper presents the experimental results and the results of direct numerical simulation of the development and interaction of two wave trains from two point sources of controlled disturbances in a supersonic boundary layer on a flat plate with an incident flow Mach number of 2.5. Sources were located parallel to the leading edge of the model. For the introduction of controlled disturbances into the boundary layer, the normal component of the mass flow rate was varied in the calculations. In the experiment, periodic glow discharges at a frequency of 20 kHz were used. In both cases, the disturbances sources worked synchronously. Mass flow rate pulsations were measured and recorded in sections, parallel to the leading edge of the model, near the maximum of disturbances along the boundary layer. In the experiment, a constanttemperature hot-wire anemometer was used. After performing a discrete Fourier transform, the spatial distributions of disturbances, the beta-spectra were determined, and the wave characteristics of the development of disturbances downstream were estimated. In addition, direct numerical simulation of the downstream development of disturbances from a single source was performed. The work presents a comparison of experimental and theoretical calculated data. The paper discusses the effects inherent in the interaction of unstable traveling controlled disturbances from two sources operating synchronously.

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Section: Problem Statement Numerical Methods and Experimental Setupmentioning

confidence: 99%

Experimental and numerical investigation of controlled disturbances development from two sources in supersonic boundary layer

et al. 2019

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“…The experiments were conducted in the T-325 wind tunnel situated at the Institute of Theoretical and Applied Mechanics (ITAM). The T-325 is an ejector type wind tunnel with exhaust into the atmosphere, and dimensions of the test section are 0.2 × 0.2 × 0.6 m. Some description of the T-325 wind tunnel can be found in the paper [50]. The experiments were conducted under the following free stream flow conditions: Mach number of 1.43, unit Reynolds numbers (Re 1 ) of 10.6 × 10 6 (1/m) ± 0.2%, stagnation pressure of 70 kPa ± 0.4%, and stagnation temperature (T 0 ) of 296.7 K ± 0.2%.…”

Section: Arrangement Of Experimentsmentioning

confidence: 99%

Response of the Shock Wave/Boundary Layer Interaction to Disturbances Induced by the Plasma Discharge

Vishnyakov,

Polivanov,

Sidorenko

2023

Aerospace

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The paper focuses on the investigation of unsteady effects in shock wave/boundary layer interaction. The study was carried out using a flat plate model subjected to a free stream Mach number of 1.43 and a unit Reynolds number (Re1) of 11.5 × 106 1/m. To generate two-dimensional disturbances in the laminar boundary layer upstream of the separation region, a dielectric barrier discharge was employed. The disturbances were generated within the frequency range of 500 to 1700 Hz. The Strouhal numbers based on the length of the separation bubble ranged from 0.04 to 0.13. The measurements were carried out using a hot-wire anemometer. Analysis of the data shows that disturbances in this frequency range mostly decay. The maximum amplitudes of perturbations were observed at frequencies of 1250 Hz and 1700 Hz.

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“…Unlike mechanical wind meters, these devices have a rapid response time and a lack of mechanically moveable parts, which are installed near the ground or inside the system, where it can measure small vortices and the impact of the local climate. However, relative unit spending is prohibitive for many environmental applications [78][79][80][81].…”

Section: Hot-wire Anemometermentioning

confidence: 99%

Wind Generation Forecasting Methods and Proliferation of Artificial Neural Network: A Review of Five Years Research Trend

et al. 2020

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To sustain a clean environment by reducing fossil fuels-based energies and increasing the integration of renewable-based energy sources, i.e., wind and solar power, have become the national policy for many countries. The increasing demand for renewable energy sources, such as wind, has created interest in the economic and technical issues related to the integration into the power grids. Having an intermittent nature and wind generation forecasting is a crucial aspect of ensuring the optimum grid control and design in power plants. Accurate forecasting provides essential information to empower grid operators and system designers in generating an optimal wind power plant, and to balance the power supply and demand. In this paper, we present an extensive review of wind forecasting methods and the artificial neural network (ANN) prolific in this regard. The instrument used to measure wind assimilation is analyzed and discussed, accurately, in studies that were published from May 1st, 2014 to May 1st, 2018. The results of the review demonstrate the increased application of ANN into wind power generation forecasting. Considering the component limitation of other systems, the trend of deploying the ANN and its hybrid systems are more attractive than other individual methods. The review further revealed that high forecasting accuracy could be achieved through proper handling and calibration of the wind-forecasting instrument and method.

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Investigation of laminar-turbulent transition of supersonic boundary layer by scanning constant temperature hot-wire anemometer

Cited by 27 publications

References 9 publications

Experimental and numerical investigation of controlled disturbances development from two sources in supersonic boundary layer

Experimental and numerical investigation of controlled disturbances development from two sources in supersonic boundary layer

Response of the Shock Wave/Boundary Layer Interaction to Disturbances Induced by the Plasma Discharge

Wind Generation Forecasting Methods and Proliferation of Artificial Neural Network: A Review of Five Years Research Trend

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