Sound state constant temperature anemometer for fluid flow studies

Parameswaraiah, R and Sreeharamurthy, V (1972) Sound state constant temperature anemometer for fluid flow studies. Technical Report. National Aeronautical Laboratory, Bangalore,India.

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    Abstract

    Design and development of a solid state constant temp-13; erature anemometer system for use in fluid flow studies including mean and fluctuating flows, shock tube flows, atmospheric turbulence, skin friction measurements etc., are described. The system consists of a sensor, a hot wire or hot film, which is held submerged in the flow to be measured and is arranged to be in one arm of a Wheatstone bridge circuit, other arms of which are standard resistances. This sensor is maintained at constant resistance and hence constant temperature by a feedback circuit which,13; based on the signal across the diagonal points of Bridge circuit, controls the Bridge supply voltage to keep the Bridge in perfect balance irrespective of changes imposed by flow on the heat loss from sensor. Supply voltage then becomes a measure of flow parameters past the sensor. A zero suppressor incorporated in the system, by allowing suppression of bridge supply voltage at no-flow conditions, increases the accuracy in recording of the bridge voltage thus enhancing the resolution of the system for a given panel meter.system may be used in determining the frequency xesr,onse of the anemometer system and sensor. A procedure for estimating the frequency response of the complete system is also given. Wind Tunnel measurements show that the performance of the developed system is very satisfactory. With hot wire sensors, the system frequency response has a maximum of 50 KHz.13;

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Wheatstone bridge;Fluid flow studies
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: UNSPECIFIED
    Depositing User: M/S ICAST NAL
    Date Deposited: 18 Jan 2007
    Last Modified: 24 May 2010 09:54
    URI: http://nal-ir.nal.res.in/id/eprint/3907

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