DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM
In the present work, cross section size investigation of the plenum chamber of a marine gas turbine air supply system was done. Flow in ducts make noise and in the case of turbine inle...
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| Format: | Article |
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Sharif University of Technology
2018-11-01
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| Series: | مهندسی مکانیک شریف |
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| Online Access: | https://sjme.journals.sharif.edu/article_6414_d3a0f5ae97a0b41604c433da8e7073ad.pdf |
| _version_ | 1797404471560503296 |
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| author | M. Rasoulimoghadam M. Mirzabozorg S. Kheradmand |
| author_facet | M. Rasoulimoghadam M. Mirzabozorg S. Kheradmand |
| author_sort | M. Rasoulimoghadam |
| collection | DOAJ |
| description | In the present work, cross section size investigation of the plenum chamber of a marine gas turbine air supply system was done. Flow in ducts make noise and in the case of turbine inlet due to amount of flow this noise is very high and should be considered. Using numerical simulations, a method to find a suitable design considering both the acoustic and aerodynamic performance presented. In this method, at First air supply channel system of marine gas turbine according to the requirements of the aerodynamic and acoustic were categorized into three sections; input, plenum chamber and output channels with circular cross sections. The geometric dimensions of input and output channels determined using the theory of plane waves within the channel, without considering the effects of flow also considering the limits of space inside the float at dominant frequency. Then suitable size of the intermediate cross section of the channel in terms of both aerodynamic and acoustic requirements with regard to the effects of flow using numerical methods were studied and determined. Various 3 Dimensional turbulent flows inside chamber are considered for this work where large eddy simulation turbulence model is used. Ffowcs, Williams and Hawkings model is used for the sound propagation process based on Lighthill integral equation. Validity of the simulation is checked by comparing results (sound pressure level) against experimental data in a chamber and error is acceptable over range of studied frequencies. The results showed that channel system aerodynamic performance decreases and its acoustic performance initially increases and then decreases with the increase in cross section of the plenum chamber than the cross section of the inlet / outlet channel. In addition, deviation from plane waves in considering the effects of flow is observed in channel. That is due to the effects of the current flowing through Channel system and the effect of quadrupole sources in the production of sound in the channel system, which causes higher modes. |
| first_indexed | 2024-03-09T02:55:28Z |
| format | Article |
| id | doaj.art-cf1375010df7479c90014c8316b60fe8 |
| institution | Directory Open Access Journal |
| issn | 2676-4725 2676-4733 |
| language | fas |
| last_indexed | 2024-03-09T02:55:28Z |
| publishDate | 2018-11-01 |
| publisher | Sharif University of Technology |
| record_format | Article |
| series | مهندسی مکانیک شریف |
| spelling | doaj.art-cf1375010df7479c90014c8316b60fe82023-12-05T07:18:31ZfasSharif University of Technologyمهندسی مکانیک شریف2676-47252676-47332018-11-0134.32192910.24200/j40.2018.64146414DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEMM. Rasoulimoghadam0M. Mirzabozorg1S. Kheradmand2Dept. of Mechanical and Aerospace Engineering Malek-Ashtar University of TechnologyDept. of Mechanical and Aerospace Engineering Malek-Ashtar University of TechnologyDept. of Mechanical and Aerospace Engineering Malek-Ashtar University of TechnologyIn the present work, cross section size investigation of the plenum chamber of a marine gas turbine air supply system was done. Flow in ducts make noise and in the case of turbine inlet due to amount of flow this noise is very high and should be considered. Using numerical simulations, a method to find a suitable design considering both the acoustic and aerodynamic performance presented. In this method, at First air supply channel system of marine gas turbine according to the requirements of the aerodynamic and acoustic were categorized into three sections; input, plenum chamber and output channels with circular cross sections. The geometric dimensions of input and output channels determined using the theory of plane waves within the channel, without considering the effects of flow also considering the limits of space inside the float at dominant frequency. Then suitable size of the intermediate cross section of the channel in terms of both aerodynamic and acoustic requirements with regard to the effects of flow using numerical methods were studied and determined. Various 3 Dimensional turbulent flows inside chamber are considered for this work where large eddy simulation turbulence model is used. Ffowcs, Williams and Hawkings model is used for the sound propagation process based on Lighthill integral equation. Validity of the simulation is checked by comparing results (sound pressure level) against experimental data in a chamber and error is acceptable over range of studied frequencies. The results showed that channel system aerodynamic performance decreases and its acoustic performance initially increases and then decreases with the increase in cross section of the plenum chamber than the cross section of the inlet / outlet channel. In addition, deviation from plane waves in considering the effects of flow is observed in channel. That is due to the effects of the current flowing through Channel system and the effect of quadrupole sources in the production of sound in the channel system, which causes higher modes.https://sjme.journals.sharif.edu/article_6414_d3a0f5ae97a0b41604c433da8e7073ad.pdfaero acousticslarge eddy simulationlighthill analysisffowcs williams and hawkings modelspropagation of wave in duct |
| spellingShingle | M. Rasoulimoghadam M. Mirzabozorg S. Kheradmand DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM مهندسی مکانیک شریف aero acoustics large eddy simulation lighthill analysis ffowcs williams and hawkings models propagation of wave in duct |
| title | DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM |
| title_full | DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM |
| title_fullStr | DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM |
| title_full_unstemmed | DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM |
| title_short | DESIGN AND NUMERICAL SIMULATING OF THE PERFORMANCE OF ACOUSTIC PLENUM CHAMBER OF THE MARINE GAS TURBINE AIR SUPPLY SYSTEM |
| title_sort | design and numerical simulating of the performance of acoustic plenum chamber of the marine gas turbine air supply system |
| topic | aero acoustics large eddy simulation lighthill analysis ffowcs williams and hawkings models propagation of wave in duct |
| url | https://sjme.journals.sharif.edu/article_6414_d3a0f5ae97a0b41604c433da8e7073ad.pdf |
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