A Small Perturbation CFD Method for Calculation of Seal Rotordynamic Coefficients
Seal rotordynamic coefficients link the fluid reaction forces to the rotor motion, and hence are needed in the stability calculations for the overall rotating systems. Presented in this paper is a numerical method for calculations of rotordynamic coefficients of turbomachinery seals with rotors nomi...
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| Format: | Article |
| Language: | English |
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Wiley
1996-01-01
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| Series: | International Journal of Rotating Machinery |
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| Online Access: | http://dx.doi.org/10.1155/S1023621X96000048 |
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| _version_ | 1849409360439017472 |
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| author | M. M. Athavale R. C. Hendricks |
| author_facet | M. M. Athavale R. C. Hendricks |
| author_sort | M. M. Athavale |
| collection | DOAJ |
| description | Seal rotordynamic coefficients link the fluid reaction forces to the rotor motion, and hence are needed in the stability calculations for the overall rotating systems. Presented in this paper is a numerical method for calculations of rotordynamic
coefficients of turbomachinery seals with rotors nominally at centered, eccentric and/or misaligned position. The rotor of the seal is assumed to undergo a prescribed small whirling motion about its nominal position. The resulting flow variable perturbations are expressed as Fourier functions in time. The N-S equations are used to generate the governing equations for the perturbation variables. Use of complex variables for the perturbations renders the problem quasi-steady. The fluid reaction forces are integrated on the rotor surface to obtain the fluid reaction forces at several different whirl frequencies.
The rotordynamic coefficients are calculated using appropriate curve fitting. Details of the model are presented, and sample results for concentric and eccentric annular incompressible flow seals are included to demonstrate the capability and accuracy of the proposed method. |
| format | Article |
| id | doaj-art-765346d3838343ada47db3228d0db099 |
| institution | Kabale University |
| issn | 1023-621X |
| language | English |
| publishDate | 1996-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-765346d3838343ada47db3228d0db0992025-08-20T03:35:32ZengWileyInternational Journal of Rotating Machinery1023-621X1996-01-012316717710.1155/S1023621X96000048A Small Perturbation CFD Method for Calculation of Seal Rotordynamic CoefficientsM. M. Athavale0R. C. Hendricks1CFD Research Corporation, Huntsville, AL NASA Lewis Research Center, Cleveland, OH, USACFD Research Corporation, Huntsville, AL NASA Lewis Research Center, Cleveland, OH, USASeal rotordynamic coefficients link the fluid reaction forces to the rotor motion, and hence are needed in the stability calculations for the overall rotating systems. Presented in this paper is a numerical method for calculations of rotordynamic coefficients of turbomachinery seals with rotors nominally at centered, eccentric and/or misaligned position. The rotor of the seal is assumed to undergo a prescribed small whirling motion about its nominal position. The resulting flow variable perturbations are expressed as Fourier functions in time. The N-S equations are used to generate the governing equations for the perturbation variables. Use of complex variables for the perturbations renders the problem quasi-steady. The fluid reaction forces are integrated on the rotor surface to obtain the fluid reaction forces at several different whirl frequencies. The rotordynamic coefficients are calculated using appropriate curve fitting. Details of the model are presented, and sample results for concentric and eccentric annular incompressible flow seals are included to demonstrate the capability and accuracy of the proposed method.http://dx.doi.org/10.1155/S1023621X96000048SealsrotordynamicsturbomachineryperturbationNavier-StokesCFD. |
| spellingShingle | M. M. Athavale R. C. Hendricks A Small Perturbation CFD Method for Calculation of Seal Rotordynamic Coefficients International Journal of Rotating Machinery Seals rotordynamics turbomachinery perturbation Navier-Stokes CFD. |
| title | A Small Perturbation CFD Method for Calculation of
Seal Rotordynamic Coefficients |
| title_full | A Small Perturbation CFD Method for Calculation of
Seal Rotordynamic Coefficients |
| title_fullStr | A Small Perturbation CFD Method for Calculation of
Seal Rotordynamic Coefficients |
| title_full_unstemmed | A Small Perturbation CFD Method for Calculation of
Seal Rotordynamic Coefficients |
| title_short | A Small Perturbation CFD Method for Calculation of
Seal Rotordynamic Coefficients |
| title_sort | small perturbation cfd method for calculation of seal rotordynamic coefficients |
| topic | Seals rotordynamics turbomachinery perturbation Navier-Stokes CFD. |
| url | http://dx.doi.org/10.1155/S1023621X96000048 |
| work_keys_str_mv | AT mmathavale asmallperturbationcfdmethodforcalculationofsealrotordynamiccoefficients AT rchendricks asmallperturbationcfdmethodforcalculationofsealrotordynamiccoefficients AT mmathavale smallperturbationcfdmethodforcalculationofsealrotordynamiccoefficients AT rchendricks smallperturbationcfdmethodforcalculationofsealrotordynamiccoefficients |