Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method
Whereas the demand for missiles and rockets has exponentially augmented, but the difficulties related to the gas dynamics of these vehicles remains to be a threat. Whenever there is a sudden expansion, the pressure in the downstream is subatmospheric. This low pressure in the recirculation zone lea...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
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Penerbit Akademia Baru
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/1/72294_Analysis%20of%20Area%20Ratio%20In%20a%20CD%20Nozzle.pdf http://irep.iium.edu.my/72294/7/72294_Analysis%20of%20area%20ratio%20in%20a%20CD%20nozzle_scopus.pdf |
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| author | Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman |
| author_facet | Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman |
| author_sort | Khan, Sher Afghan |
| building | IIUM Repository |
| collection | Online Access |
| description | Whereas the demand for missiles and rockets has exponentially augmented, but the difficulties related to the gas dynamics of these vehicles remains to be a threat.
Whenever there is a sudden expansion, the pressure in the downstream is subatmospheric. This low pressure in the recirculation zone leads to a considerable amount of drag, which is nearly two-thirds of the net drag of the aerospace vehicles. Hence, in view of the above problem, many researchers tried to control the base pressure depending upon the mission requirements. For example, in case of
combustion chamber, we would like to decrease the base pressure as low as possible to have better mixing and efficient combustion, whereas, in case of the external
ballistics application we would like to increase the base pressure as high as possible to reduce the drag of the projectiles to enhance the range. In this paper, investigated the effects of an area ratio in suddenly expanded duct and base pressure control with microjets using the computational fluid dynamics (CFD) method. A 1 mm orifice diameter of microjets placed at the pitch circle diameter (PCD) of 13 mm, located at 90 degrees for active control. The Mach number is M = 2.2, the L/D ratio is 8, the nozzle pressure ratio’s (NPR) is 9 and the area ratios are 2.56, 3.24, 4.86 and 6.25 considered in the present study. The design and modeling of convergent-divergent (CD) nozzle
simulated using K-ε turbulence model for standard wall function. From the present results, it has been observed that the area ratio plays a crucial role in fixing the base
pressure values. |
| first_indexed | 2025-11-14T17:27:18Z |
| format | Article |
| id | iium-72294 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:27:18Z |
| publishDate | 2019 |
| publisher | Penerbit Akademia Baru |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-722942019-09-02T13:15:57Z http://irep.iium.edu.my/72294/ Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman TL Motor vehicles. Aeronautics. Astronautics U Military Science (General) Whereas the demand for missiles and rockets has exponentially augmented, but the difficulties related to the gas dynamics of these vehicles remains to be a threat. Whenever there is a sudden expansion, the pressure in the downstream is subatmospheric. This low pressure in the recirculation zone leads to a considerable amount of drag, which is nearly two-thirds of the net drag of the aerospace vehicles. Hence, in view of the above problem, many researchers tried to control the base pressure depending upon the mission requirements. For example, in case of combustion chamber, we would like to decrease the base pressure as low as possible to have better mixing and efficient combustion, whereas, in case of the external ballistics application we would like to increase the base pressure as high as possible to reduce the drag of the projectiles to enhance the range. In this paper, investigated the effects of an area ratio in suddenly expanded duct and base pressure control with microjets using the computational fluid dynamics (CFD) method. A 1 mm orifice diameter of microjets placed at the pitch circle diameter (PCD) of 13 mm, located at 90 degrees for active control. The Mach number is M = 2.2, the L/D ratio is 8, the nozzle pressure ratio’s (NPR) is 9 and the area ratios are 2.56, 3.24, 4.86 and 6.25 considered in the present study. The design and modeling of convergent-divergent (CD) nozzle simulated using K-ε turbulence model for standard wall function. From the present results, it has been observed that the area ratio plays a crucial role in fixing the base pressure values. Penerbit Akademia Baru 2019-05-20 Article PeerReviewed application/pdf en http://irep.iium.edu.my/72294/1/72294_Analysis%20of%20Area%20Ratio%20In%20a%20CD%20Nozzle.pdf application/pdf en http://irep.iium.edu.my/72294/7/72294_Analysis%20of%20area%20ratio%20in%20a%20CD%20nozzle_scopus.pdf Khan, Sher Afghan and Aabid, Abdul and Ghasi, Fharukh Ahmed Mehaboobali and Al-Robaian, Abdulrahman and Alsagri, Ali Sulaiman (2019) Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method. CFD Letters, 11 (5). pp. 61-71. ISSN 2180-1363 http://www.akademiabaru.com/doc/CFDLV11_N5_P61_71.pdf |
| spellingShingle | TL Motor vehicles. Aeronautics. Astronautics U Military Science (General) Khan, Sher Afghan Aabid, Abdul Ghasi, Fharukh Ahmed Mehaboobali Al-Robaian, Abdulrahman Alsagri, Ali Sulaiman Analysis of area ratio in a CD nozzle with suddenly expanded duct using CFD method |
| title | Analysis of area ratio in a CD nozzle with suddenly expanded
duct using CFD method |
| title_full | Analysis of area ratio in a CD nozzle with suddenly expanded
duct using CFD method |
| title_fullStr | Analysis of area ratio in a CD nozzle with suddenly expanded
duct using CFD method |
| title_full_unstemmed | Analysis of area ratio in a CD nozzle with suddenly expanded
duct using CFD method |
| title_short | Analysis of area ratio in a CD nozzle with suddenly expanded
duct using CFD method |
| title_sort | analysis of area ratio in a cd nozzle with suddenly expanded
duct using cfd method |
| topic | TL Motor vehicles. Aeronautics. Astronautics U Military Science (General) |
| url | http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/ http://irep.iium.edu.my/72294/1/72294_Analysis%20of%20Area%20Ratio%20In%20a%20CD%20Nozzle.pdf http://irep.iium.edu.my/72294/7/72294_Analysis%20of%20area%20ratio%20in%20a%20CD%20nozzle_scopus.pdf |