Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal
Air-induced force generated in seals is one key factor on the stability of the rotor system. In this paper, a novel negative dislocated seal (NDS) was developed in respect of dislocated bearing theory, to reduce hydrodynamic pressure effect and air-induced force and improve rotor stability as well....
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
|
| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2019/1780390 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849408358210076672 |
|---|---|
| author | Dan Sun Xudong Wang Chengwei Fei Huan Zhao Guochen Zhang Wenzhong Tang |
| author_facet | Dan Sun Xudong Wang Chengwei Fei Huan Zhao Guochen Zhang Wenzhong Tang |
| author_sort | Dan Sun |
| collection | DOAJ |
| description | Air-induced force generated in seals is one key factor on the stability of the rotor system. In this paper, a novel negative dislocated seal (NDS) was developed in respect of dislocated bearing theory, to reduce hydrodynamic pressure effect and air-induced force and improve rotor stability as well. A test rig was built to test rotordynamic characteristics and rotor stability of the NDS. The rotordynamic characteristics of seals were investigated based on the unbalanced synchronous excitation method, and seal-rotor system stability was evaluated by the identification method with an electromagnetic bearing exciter. The effects of both rotating speed and inlet/outlet pressure ratio on the rotordynamic characteristics and rotor stability of both NDS and conventional cylindrical labyrinth seal were experimentally investigated. The results show that with the increasing rotating speed, inlet/outlet pressure ratio is promising to reduce the direct stiffness coefficients of seals and the logarithmic decrement rate of seal-rotor system and enhance both cross stiffness and damping coefficient as well. Besides, the developed NDS effectively reduces cross-stiffness coefficients and increases direct damping coefficients and the logarithmic decrement rate of the seal-rotor system, relative to the conventional cylindrical seal. The proposed seal can effectively improve seal stability of turbomachinery. |
| format | Article |
| id | doaj-art-7ea4105bd5d744c3837809b0b85f5985 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-7ea4105bd5d744c3837809b0b85f59852025-08-20T03:35:48ZengWileyShock and Vibration1070-96221875-92032019-01-01201910.1155/2019/17803901780390Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated SealDan Sun0Xudong Wang1Chengwei Fei2Huan Zhao3Guochen Zhang4Wenzhong Tang5Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, Shenyang Aerospace University, Shenyang 110136, ChinaAECC Sichuan Gas Turbine Establishment, Chengdu 610500, ChinaDepartment of Aeronautics and Astronautics, Fudan University, Shanghai 200433, ChinaLiaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, Shenyang Aerospace University, Shenyang 110136, ChinaLiaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, Shenyang Aerospace University, Shenyang 110136, ChinaSchool of Computer Science and Engineering, Beihang University, Beijing 100191, ChinaAir-induced force generated in seals is one key factor on the stability of the rotor system. In this paper, a novel negative dislocated seal (NDS) was developed in respect of dislocated bearing theory, to reduce hydrodynamic pressure effect and air-induced force and improve rotor stability as well. A test rig was built to test rotordynamic characteristics and rotor stability of the NDS. The rotordynamic characteristics of seals were investigated based on the unbalanced synchronous excitation method, and seal-rotor system stability was evaluated by the identification method with an electromagnetic bearing exciter. The effects of both rotating speed and inlet/outlet pressure ratio on the rotordynamic characteristics and rotor stability of both NDS and conventional cylindrical labyrinth seal were experimentally investigated. The results show that with the increasing rotating speed, inlet/outlet pressure ratio is promising to reduce the direct stiffness coefficients of seals and the logarithmic decrement rate of seal-rotor system and enhance both cross stiffness and damping coefficient as well. Besides, the developed NDS effectively reduces cross-stiffness coefficients and increases direct damping coefficients and the logarithmic decrement rate of the seal-rotor system, relative to the conventional cylindrical seal. The proposed seal can effectively improve seal stability of turbomachinery.http://dx.doi.org/10.1155/2019/1780390 |
| spellingShingle | Dan Sun Xudong Wang Chengwei Fei Huan Zhao Guochen Zhang Wenzhong Tang Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal Shock and Vibration |
| title | Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal |
| title_full | Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal |
| title_fullStr | Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal |
| title_full_unstemmed | Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal |
| title_short | Experimental Investigation on Rotordynamic Characteristics and Rotor System Stability of a Novel Negative Dislocated Seal |
| title_sort | experimental investigation on rotordynamic characteristics and rotor system stability of a novel negative dislocated seal |
| url | http://dx.doi.org/10.1155/2019/1780390 |
| work_keys_str_mv | AT dansun experimentalinvestigationonrotordynamiccharacteristicsandrotorsystemstabilityofanovelnegativedislocatedseal AT xudongwang experimentalinvestigationonrotordynamiccharacteristicsandrotorsystemstabilityofanovelnegativedislocatedseal AT chengweifei experimentalinvestigationonrotordynamiccharacteristicsandrotorsystemstabilityofanovelnegativedislocatedseal AT huanzhao experimentalinvestigationonrotordynamiccharacteristicsandrotorsystemstabilityofanovelnegativedislocatedseal AT guochenzhang experimentalinvestigationonrotordynamiccharacteristicsandrotorsystemstabilityofanovelnegativedislocatedseal AT wenzhongtang experimentalinvestigationonrotordynamiccharacteristicsandrotorsystemstabilityofanovelnegativedislocatedseal |