Conference
Harmonic Analysis of Diffuser Inlet Static Pressure Distortion for Centrifugal Stages
| العنوان: | Harmonic Analysis of Diffuser Inlet Static Pressure Distortion for Centrifugal Stages |
|---|---|
| المؤلفون: | Japikse, D., Wight, Sharon |
| المساهمون: | Concepts NREC |
| المصدر: | 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2017) https://hal.archives-ouvertes.fr/hal-03004932 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2017), Dec 2017, Maui, United States |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2017 |
| المجموعة: | Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
| مصطلحات موضوعية: | Radial compressor, radial pump, distortion, non-axisymmetric flow, periodicity, harmonic analysis, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph] |
| جغرافية الموضوع: | Maui, United States |
| الوصف: | International audience ; Preliminary studies of the impeller exit/vaned diffuser inlet static pressure field distortion have been reported by Japikse and Krivitzky (2016). The present work extends the study to a set of nine different impellers with a wide variety of vaned diffusers from four different test rigs and a three-stage industrial compressor. Pertinent work of similar cases from others is reviewed. In all cases where a high number of uniformly spaced pressure taps (p2) were used to measure the time-averaged local static pressure, a clear set of harmonics in a Fourier representation of the time-averaged diffuser inlet pressure field was evident, which effectively establishes the signature or fingerprint of the specific stage. In all such cases, the strongest harmonic amplitude for the resulting pressure trace analysis was the diffuser vane count which exhibits various amplitude and phase shifting with change in flow rate for a given speed operation. The next largest amplitude harmonic was usually (but not always) the first, second, or third spatial harmonic, which can never be neglected for pressure trace representation. Significant study of pressure field phase angle shifts and amplitude shifts occur for these lowest spatial frequencies, representing part of the static pressure field when moving from flow point to flow point along an operating speed line. In certain cases, for example, with a certain 14-vane diffuser, spatial subharmonics of 6, 8, and 12 may also play a role in fully representing the steady, circumferential, inlet static pressure field. The cause of this unexpected pressure field distortion is not completely understood at this point. Hypotheses are suggested, and the next steps for research are outlined. The historical hypothesis of equal flow per diffuser passage is carefully reviewed and rejected, and hence periodicity is not established for these radial discharge centrifugal stages. Various tests conducted to test invariance to rig and environmental factors are reviewed. The role ... |
| نوع الوثيقة: | conference object |
| اللغة: | English |
| Relation: | hal-03004932; https://hal.archives-ouvertes.fr/hal-03004932; https://hal.archives-ouvertes.fr/hal-03004932/document; https://hal.archives-ouvertes.fr/hal-03004932/file/177.finalpaper.pdf |
| الاتاحة: | https://hal.archives-ouvertes.fr/hal-03004932 https://hal.archives-ouvertes.fr/hal-03004932/document https://hal.archives-ouvertes.fr/hal-03004932/file/177.finalpaper.pdf |
| Rights: | http://creativecommons.org/licenses/by/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.931164F3 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |