Development of a Centrifugal Compressor With a Variable Geometry Split-Ring Pipe Diffuser

Author:

Salvage J. W.1

Affiliation:

1. United Technologies, Carrier Corporation, Carrier Parkway, TR-4, P.O. Box 4808 Syracuse, NY 13221

Abstract

Higher noise levels resulted when a compressor was scaled to larger capacity. The machine’s sound pressure level was relieved by increasing the distance between the impeller blade tip and diffuser leading edge. However, the part-load surge line deteriorated severely as a consequence. A variable geometry pipe diffuser solved this problem, permitting operation at stringent off-design conditions. The addition of a variable diffuser permits compressor selection very near its most efficient full-load operating point, without regard for limitations normally imposed by part-load requirements. The principal lessons learned during aerodynamic design refinement include (a) how performance and surge depend upon positioning the variable inlet guide vanes and variable diffuser, and (b) how to define simultaneous variation of inlet guide vanes and diffuser for specific operational objectives. Generally, each operating point requires a unique setting of the variable components to achieve maximum efficiency. However, linked movement is shown to yield both a satisfactory surge line and improved performance for most applications when compared to a compressor without the variable geometry pipe diffuser.

Publisher

ASME International

Subject

Mechanical Engineering

Reference8 articles.

1. ARI Standard 550, 1990, Standard for Centrifugal or Rotary Screw Water-Chilling Packages, Air-Conditioning and Refrigeration Institute, Arlington, Va.

2. ARI Standard 575, 1994, Standard for Method of Measuring Machinery Sound Within an Equipment Space, Air-Conditioning and Refrigeration Institute, Arlington, VA.

3. Comey, D., Miccio, J., Palmreuter, E., and Waterman, W., 1985, “Variable Cycle Technology Propulsion System Program, Volume I, Variable Geometry Diffuser, Part II—Industry Version,” AFWAL-TR-84-2090, Vol. I, Pt. II Wright-Patterson Airforce Base, OH.

4. Harada, Hideomi, 1996, “Study of a Surge-Free Centrifugal Compressor With Automatically Variable Inlet and Diffusser Vanes,” ASME Paper No. 96-GT-153.

5. Simon H. , WellmanT., and MonkT., 1987, “Improvements in Performance Characteristics of Single-Stage and Multistage Centrifugal Compressors by Simultaneous Adjustment of Inlet Guide Vanes and Diffuser Vanes,” ASME JOURNAL OF TURBOMACHINERY, Vol. 109, No. 1, pp. 41–7.

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