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• W2224761327 abstract "w The measurements were performed in the plane mixing layer and in the wake behind a cylinder. A closed-type wind tunnel with an open working section was used. The mixing layer produced in the exhaust of air from a square nozzle 40  40 cm into a quiescent atmosphere was investigated. The exhaust velocity was 4 and 8 m/see. The temperature difference in the mixing layer was 15~ The measurements were performed at 30 cm from the nozzle exit. When investigating the wake behind the cylinder, a rectangular nozzle 30  50 em was used. 'I~e diameter of the cylinder was d=8 mm; the cylinder was mounted across the short end of the nozzle. Theexhaust velocity was 15 m/see. The cylinder was heated to a temperature of 500~ The measurements were performed at a distance of 42 cm from the cylinder. In this section the maximum temperature of the wake exceeded the temperature of the flow by 3~ Measurements of the mean velocity and the velocity fluctuations in the wake behind a cold cylinder indicated that in this section the heating of the cylinder has a negligible effect on the flow characteristics. The velocity and temperature measurements and also an analog treatment of the signals were performed with the use of equipment made by the D1SA firm. In the velocity measurements we used a probe with two parallel tungsten filaments 5 p in diameter and 1.2 mm long. One of the filaments operated with high superheating (0.8) and acted as the velocity meter, and the second operated with low superheating and served to compensate for the measurement of the flow temperature. The frequency range of the equipment inthe velocity measurements was 30 kHz. The temperature measurements employed a probe with a platinum wire 1 g in diameter and 0.4 mm long. The thermoanemometer operated as a resistance thermometer without compensation for the thermal inertia of the wire. This method allowed us to record temperature fluctuations with a frequency up to 3 fritz." @default.
• W2224761327 created "2016-06-24" @default.
• W2224761327 creator A5022595742 @default.
• W2224761327 creator A5081403181 @default.
• W2224761327 date "1977-01-01" @default.
• W2224761327 modified "2023-09-27" @default.
• W2224761327 title "The results of an experimental investigation of the turbulence characteristics in the plane mix- ing layer and in the wake behind a cylinder are given. Measurements are made of the distribu- tion of the velocity and temperature probabilities, the intermittency coefficient, and the condi- tionally averaged values of the square of the velocity and temperature derivatives." @default.
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