Two types of pickup-gages, a vaue-type pickup and a sounding-type pickup which record the air flow direction on the diffuser blades of a compressor were developed in the Department of Turbine Building of the Leningrad Polytechnic Institute. The pickup design principle consists of an automatic control with reversible diffuser blades, providing shockless operation of the compressor by setting an optimum air inflow angle on the diffuser blades under any operating conditions. An analysis of investigations carried out with the described pickups revealed that the pressure drop in the chambers of the pickup is a function of the damper dislocation and generally takes place within the first hundredth of a millimeter. Depending on the desired impulse rate, there may be any relationship between the nozzle diameters D1 and the constant choke diameter D2. To increase the effect of the pickup amplifier in a control system with pulse compensation, the condition D1 greater than D2 must hold, with D1 selected as small as possible and the nozzle provided with a sharp edge to decrease the adhesion of the damper to it. The character of the pressure drop in the pickup was found not to be affected by the pressure of the air supplied.

  • Authors:
    • Shifrin, B I
  • Publication Date: 1968

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Filing Info

  • Accession Number: 00014987
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM