Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors
In order to study the flow characteristics of a nozzle with large expansion ratio and its influence on the force on the nozzle, ground cold flow test research and a fluid–structure coupling simulation analysis were carried out (maximum expansion ratio ε = 30.25). The variation and pulsation characte...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
|
| Series: | Aerospace |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2226-4310/10/1/4 |
| _version_ | 1797439181986725888 |
|---|---|
| author | Zhihong Wang Chunguang Wang Weiping Tian |
| author_facet | Zhihong Wang Chunguang Wang Weiping Tian |
| author_sort | Zhihong Wang |
| collection | DOAJ |
| description | In order to study the flow characteristics of a nozzle with large expansion ratio and its influence on the force on the nozzle, ground cold flow test research and a fluid–structure coupling simulation analysis were carried out (maximum expansion ratio ε = 30.25). The variation and pulsation characteristics of the pressure near the measuring point area and the inlet pressure were obtained through experiments. Through the analysis of the peak-to-peak value and average value, it was found that the average pressure after separation increases by 90%, but the peak-to-peak value increases by about five times, indicating that the pressure fluctuation after separation is much larger than before separation. The separation flow field under cold flow conditions was simulated using the CFD commercial calculation software Fluent to verify the correctness of the numerical calculations. The fluid–structure coupling analysis was carried out on a large expansion ratio (maximum expansion ratio ε = 48) full-scale nozzle, and the structural deformation characteristics of the nozzle under the separation conditions were studied. The research results show that flow separation occurs in the nozzle with a large expansion ratio under ground conditions. Before the separation point, the pressure pulsation on the nozzle wall is small, and the turbulent pulsation effect is weak. After the separation point, the pressure pulsation increases, and the turbulent pulsation effect is enhanced. When the total pressure decreases, the separation area of the nozzle increases, and the separation flow field presents a strong asymmetry. Reducing the total inlet pressure by half resulted in approximately 50 times the lateral load. Under the combined influence of the ground conditions and low total pressure, the large lateral load caused by the asymmetry of the separation flow field will cause the deformation of the nozzle structure to increase by 5.5 times. This research provides an important reference for the design and experiment of nozzles with a large expansion ratio. |
| first_indexed | 2024-03-09T11:49:02Z |
| format | Article |
| id | doaj.art-fb1f0b74bf5d4643a11ce60f5e213693 |
| institution | Directory Open Access Journal |
| issn | 2226-4310 |
| language | English |
| last_indexed | 2024-03-09T11:49:02Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj.art-fb1f0b74bf5d4643a11ce60f5e2136932023-11-30T23:17:58ZengMDPI AGAerospace2226-43102022-12-01101410.3390/aerospace10010004Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket MotorsZhihong Wang0Chunguang Wang1Weiping Tian2State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaThe Fourth Academy of China Aerospace Science and Technology Corporation, Xi’an 710025, ChinaIn order to study the flow characteristics of a nozzle with large expansion ratio and its influence on the force on the nozzle, ground cold flow test research and a fluid–structure coupling simulation analysis were carried out (maximum expansion ratio ε = 30.25). The variation and pulsation characteristics of the pressure near the measuring point area and the inlet pressure were obtained through experiments. Through the analysis of the peak-to-peak value and average value, it was found that the average pressure after separation increases by 90%, but the peak-to-peak value increases by about five times, indicating that the pressure fluctuation after separation is much larger than before separation. The separation flow field under cold flow conditions was simulated using the CFD commercial calculation software Fluent to verify the correctness of the numerical calculations. The fluid–structure coupling analysis was carried out on a large expansion ratio (maximum expansion ratio ε = 48) full-scale nozzle, and the structural deformation characteristics of the nozzle under the separation conditions were studied. The research results show that flow separation occurs in the nozzle with a large expansion ratio under ground conditions. Before the separation point, the pressure pulsation on the nozzle wall is small, and the turbulent pulsation effect is weak. After the separation point, the pressure pulsation increases, and the turbulent pulsation effect is enhanced. When the total pressure decreases, the separation area of the nozzle increases, and the separation flow field presents a strong asymmetry. Reducing the total inlet pressure by half resulted in approximately 50 times the lateral load. Under the combined influence of the ground conditions and low total pressure, the large lateral load caused by the asymmetry of the separation flow field will cause the deformation of the nozzle structure to increase by 5.5 times. This research provides an important reference for the design and experiment of nozzles with a large expansion ratio.https://www.mdpi.com/2226-4310/10/1/4nozzle large expansion ratiolateral forceflow separation |
| spellingShingle | Zhihong Wang Chunguang Wang Weiping Tian Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors Aerospace nozzle large expansion ratio lateral force flow separation |
| title | Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors |
| title_full | Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors |
| title_fullStr | Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors |
| title_full_unstemmed | Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors |
| title_short | Study on Separation Characteristics of Nozzles with Large Expansion Ratio of Solid Rocket Motors |
| title_sort | study on separation characteristics of nozzles with large expansion ratio of solid rocket motors |
| topic | nozzle large expansion ratio lateral force flow separation |
| url | https://www.mdpi.com/2226-4310/10/1/4 |
| work_keys_str_mv | AT zhihongwang studyonseparationcharacteristicsofnozzleswithlargeexpansionratioofsolidrocketmotors AT chunguangwang studyonseparationcharacteristicsofnozzleswithlargeexpansionratioofsolidrocketmotors AT weipingtian studyonseparationcharacteristicsofnozzleswithlargeexpansionratioofsolidrocketmotors |