Application of a Modified Dynamic Compression System Model to a Low-Aspect-Ratio Fan: Effects of Inlet Distortion
Abstract
The objective of this research was to modify and calibrate a l-D dynamic compression system model, DYNTECC, to more accurately simulate compressor operation with steady, nonuniform inlet flow. The modifications were based upon parallel compressor theory, and modeled both circumferential and radial effects of distorted inlet flow. The modifications included circumferential and radial mass redistribution, dynamic blade response, and radial work redistribution. The circumferential mass redistribution allowed mass transport between adjacent circumferential segments within the compressor section, based on an orifice flow analogy. The radial mass redistribution allowed mass transport between adjacent radial segments, based on the radial momentum equation. The dynamic blade response modeled the compressor rotor blade's response to inlet circumferential pressure distortions. A dynamic lag ratio was used to damp the model's response to a flow disturbance. The simulation uses quasi-steady stage characteristics, and the lag ratio compensated for the finite response time of the rotor blade. The work redistribution utilized scale factors, allowing the stage characteristics to be defined as a function of radius. The model was calibrated to experimental data for clean and distorted inlet conditions for a two-stage, low-aspect-ratio fan. The distorted conditions were comprised of radial and circumferential total pressure distortion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1995
- Accession Number
- ADA298525
Entities
People
- Kimball A. Shahrokhi
Organizations
- Arnold Engineering Development Complex