Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors
In this paper, the flow characteristics of a continuous-type liquid–liquid pintle injector are described, focusing on the differential impact of a non-uniform center-flow distribution on single- and bi-injection methodologies as well as the cavitation effect on the spray angle. Using cold-flow exper...
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MDPI AG
2024-10-01
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| author | Dongwoo Choi Seunghyeon Lee Kyubok Ahn |
| author_facet | Dongwoo Choi Seunghyeon Lee Kyubok Ahn |
| author_sort | Dongwoo Choi |
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| description | In this paper, the flow characteristics of a continuous-type liquid–liquid pintle injector are described, focusing on the differential impact of a non-uniform center-flow distribution on single- and bi-injection methodologies as well as the cavitation effect on the spray angle. Using cold-flow experiments, jet-type flows of the center propellant caused by a non-uniform flow distribution were observed during a single injection. This resulted in an augmented pressure drop, as opposed to the flow characteristics of uniform single-film injection. By contrast, bi-injection modalities exhibited a substantial reduction in the pressure drop of the center propellant, underscoring a more equitable flow distribution. Moreover, the occurrence of cavitation in the center propellant was found to markedly affect the spray angle. By considering the injection exit area reduction caused by cavitation, the spray-angle prediction accuracy increased. The findings of this study are expected to reveal the interplay between flow distribution and pressure drop as well as that between cavitation and the spray angle in pintle injectors. Through this understanding, this study provides crucial considerations for the development of more efficient propulsion systems. |
| format | Article |
| id | doaj-art-81d65f3f35ce4cacb6be6463e7a27fca |
| institution | OA Journals |
| issn | 2226-4310 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
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| series | Aerospace |
| spelling | doaj-art-81d65f3f35ce4cacb6be6463e7a27fca2025-08-20T02:11:01ZengMDPI AGAerospace2226-43102024-10-01111084710.3390/aerospace11100847Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle InjectorsDongwoo Choi0Seunghyeon Lee1Kyubok Ahn2School of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Chungbuk, Republic of KoreaSchool of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Chungbuk, Republic of KoreaSchool of Mechanical Engineering, Chungbuk National University, Cheongju 28644, Chungbuk, Republic of KoreaIn this paper, the flow characteristics of a continuous-type liquid–liquid pintle injector are described, focusing on the differential impact of a non-uniform center-flow distribution on single- and bi-injection methodologies as well as the cavitation effect on the spray angle. Using cold-flow experiments, jet-type flows of the center propellant caused by a non-uniform flow distribution were observed during a single injection. This resulted in an augmented pressure drop, as opposed to the flow characteristics of uniform single-film injection. By contrast, bi-injection modalities exhibited a substantial reduction in the pressure drop of the center propellant, underscoring a more equitable flow distribution. Moreover, the occurrence of cavitation in the center propellant was found to markedly affect the spray angle. By considering the injection exit area reduction caused by cavitation, the spray-angle prediction accuracy increased. The findings of this study are expected to reveal the interplay between flow distribution and pressure drop as well as that between cavitation and the spray angle in pintle injectors. Through this understanding, this study provides crucial considerations for the development of more efficient propulsion systems.https://www.mdpi.com/2226-4310/11/10/847liquid–liquid pintle injectorcontinuous-type pintle tipnon-uniform flow distributionflow characteristicscavitation |
| spellingShingle | Dongwoo Choi Seunghyeon Lee Kyubok Ahn Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors Aerospace liquid–liquid pintle injector continuous-type pintle tip non-uniform flow distribution flow characteristics cavitation |
| title | Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors |
| title_full | Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors |
| title_fullStr | Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors |
| title_full_unstemmed | Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors |
| title_short | Effects of Non-Uniform Center-Flow Distribution and Cavitation on Continuous-Type Pintle Injectors |
| title_sort | effects of non uniform center flow distribution and cavitation on continuous type pintle injectors |
| topic | liquid–liquid pintle injector continuous-type pintle tip non-uniform flow distribution flow characteristics cavitation |
| url | https://www.mdpi.com/2226-4310/11/10/847 |
| work_keys_str_mv | AT dongwoochoi effectsofnonuniformcenterflowdistributionandcavitationoncontinuoustypepintleinjectors AT seunghyeonlee effectsofnonuniformcenterflowdistributionandcavitationoncontinuoustypepintleinjectors AT kyubokahn effectsofnonuniformcenterflowdistributionandcavitationoncontinuoustypepintleinjectors |