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Other Titles: Investigation of Constant Temperature Hot-Wire Anemometer at Different Filament Overheatings
Дослідження ниткового термоанемометра постійної температури при різних перегрівах нитки
Authors: Кузнецов, Д.Н.
Чупис, Д.А.
Руденко, А.С.
Kuznetsov, D.N.
Chupis, D.A.
Rudenko, A.S.
Кузнецов, Д.М.
Чупіс, Д.А.
Keywords: термоанемометр
структура турбулентності
рівняння теплового балансу
hot-wire anemometer
turbulence structure
heat balance equation
структура турбулентности
уравнение теплового баланса
Issue Date: 2013
Publisher: Донецький національний технічний університет
Citation: Наукові праці Донецького національного технічного університету. Серія: Обчислювальна техніка та автоматизація. Випуск 2 (25). - Донецьк, ДонНТУ, 2013. С - 225-231
Abstract: Предложена принципиальная схема и методика начальной настройки ниточного термоанемометра постоянной температуры для измерений тонкой структуры турбулентных газовых потоков. Приведены результаты статической градуировки термоанемометра при различных перегревах нити. Исследовано предложенное уточненное уравнение теплового баланса.
Description: The main goal of this work is constant temperature hot-wire anemometer design and investigation for measuring the fine structure of turbulent gas flows of specialized aerodynamic test benches. Heat loss anemometer is built under classic bridge circuit. Detector sensing element is produced of the 8 micron tungsten wire. Anemometer’s measuring amplifier is implemented using three operational amplifiers, thus ensuring a high gain, high input impedance and good interference rejection. Using the discrete operational amplifiers allows realizing the matching of the passive elements for the optimal circuit parameters ensuring. Particularly, possibility of the device frequency correction is realized. Distinctive feature of the designed anemometer is using of the FET with low drain-source impedance and high switch frequency in the feedback circuit. This allows increasing the measuring circuit frequency characteristic. Methodology of the anemometer’s initial tuning, including direct current balancing and frequency characteristic correction, is given. Results of the full-scale test allows evaluating the time electric constant of the anemometer’s measuring circuit, which was 20 μs, thus permitting the required band of 20-30 kHz. An improved anemometer’s heat balance equation and calibrating coefficients calculation methods are proposed for the experimental calibration data approximation accuracy increasing. Consequently, it was established that improved heat balance equation provide increasing of the experimental calibration data approximation accuracy at the average by 1,7 times.
ISSN: 2075-4272
Appears in Collections:Випуск 2 (25)'2013
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