This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Methodology for Assessing Inlet Swirl Distortion
- Aerospace Standard
Published March 07, 2022 by SAE International in United States
Downloadable datasets availableAnnotation ability available
This Aerospace Information Report (AIR) addresses the subject of aircraft inlet-swirl distortion. A structured methodology for characterizing steady-state swirl distortion in terms of swirl descriptors and for correlating the swirl descriptors with loss in stability pressure ratio is presented. The methodology is to be considered in conjunction with other SAE inlet distortion methodologies. In particular, the combined effects of swirl and total-pressure distortion on stability margin are considered. However, dynamic swirl, i.e., time-variant swirl, is not considered. The implementation of the swirl assessment methodology is shown through both computational and experimental examples. Different types of swirl distortion encountered in various engine installations and operations are described, and case studies which highlight the impact of swirl on engine stability are provided. Supplemental material is included in the appendices.
This AIR is issued to bring together information and ideas required to address the inlet-swirl problem for which common industry practice has yet to be established. This document should foster the tests and analyses necessary to mature the ideas proposed by the committee to a recommended practice. These tests and analyses must include information that justifies three main features of the proposed swirl methodology: (1) swirl descriptors for correlating inlet swirl and stability pressure ratio loss, (2) computational techniques for analyzing compression systems (inlets, fans, compressors), and (3) test protocols (instrumentation and test techniques). The committee anticipates serving the industry by using such information to establish the consensus necessary for issuance of an SAE recommended practice.
AIR5686 has been reaffirmed to comply with the SAE Five-Year Review policy.
|Aerospace Standard||Distortion Synthesis/Estimation Techniques|
|Aerospace Standard||An Assessment of Planar Waves|
Data Sets - Support Documents
|Unnamed Dataset 1|
|TABLE 1||DEFINITIONS OF TERMS IN COMPRESSOR STABILITY RATIO CORRELATION|
|Unnamed Dataset 3|
|TABLE B1||INTEGRAL CALCULATION USING TRAPEZOIDAL RULE|
S-16 Turbine Engine Inlet Flow Distortion Committee
* Redlines comparisons are available for those standards listed in the Revision History that contain a radio button. A redline comparison of the current version against a revision is accomplished by selecting the radio button next to the standard and then selecting 'compare'. At this time, Redline versions only exist for some AMS standards. SAE will continue to add redline versioning with ongoing updates to SAE MOBILUS.