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    Three-Dimensional Numerical Study of the Conical Nozzle Side Loads during Staging

    Source: Journal of Aerospace Engineering:;2016:;Volume ( 029 ):;issue: 005
    Author:
    Ruyan Jia
    ,
    Zhenyu Jiang
    ,
    Min Xiang
    ,
    Weihua Zhang
    DOI: 10.1061/(ASCE)AS.1943-5525.0000629
    Publisher: American Society of Civil Engineers
    Abstract: The objective of this paper is to numerically investigate the three-dimensional side loads and associated flow physics of a conical nozzle during the fire-in-the-hole staging event of the multistage rocket. The transient flow in nozzle is examined by a three-dimensional time-accurate numerical method with the start-up process of the upper-stage motor and the prescribed nominal separating motion of the lower stage. The impacts of asymmetric lateral motion due to non-nominal staging movement on the nozzle side loads are also numerically analyzed. These motion deviations include the relative angle between axes of two stages, relative lateral displacement between two stages, superposition of relative angle with relative lateral displacement, and angle of thrust vector control. As presented in the simulation results, the flow separation in nozzle is significantly prolonged and intensified by the obstruction of the lower stage. With the location of shockwave reflection approaching the dome of lower stage, the nozzle flow structure experiences two different, stable free shock separation (FSS) patterns. The transition from the first pattern to the second pattern results in the flow oscillation and the side loads peak. The staging motion deviations result in not only the enlarged nozzle side loads, but also a sustained unidirectional effect that may influence the flight stability of the upper stage. An essential ingredient driving the flow unsteadiness and asymmetry is related to the asymmetric reverse supersonic flow deflected by the dome and skirt corner of lower stage. Lastly, the flight data of maximum lateral force during staging of Scout’s stage I and stage II is discussed and compared with the computed results in the article.
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      Three-Dimensional Numerical Study of the Conical Nozzle Side Loads during Staging

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4245011
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    contributor authorRuyan Jia
    contributor authorZhenyu Jiang
    contributor authorMin Xiang
    contributor authorWeihua Zhang
    date accessioned2017-12-30T13:02:59Z
    date available2017-12-30T13:02:59Z
    date issued2016
    identifier other%28ASCE%29AS.1943-5525.0000629.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4245011
    description abstractThe objective of this paper is to numerically investigate the three-dimensional side loads and associated flow physics of a conical nozzle during the fire-in-the-hole staging event of the multistage rocket. The transient flow in nozzle is examined by a three-dimensional time-accurate numerical method with the start-up process of the upper-stage motor and the prescribed nominal separating motion of the lower stage. The impacts of asymmetric lateral motion due to non-nominal staging movement on the nozzle side loads are also numerically analyzed. These motion deviations include the relative angle between axes of two stages, relative lateral displacement between two stages, superposition of relative angle with relative lateral displacement, and angle of thrust vector control. As presented in the simulation results, the flow separation in nozzle is significantly prolonged and intensified by the obstruction of the lower stage. With the location of shockwave reflection approaching the dome of lower stage, the nozzle flow structure experiences two different, stable free shock separation (FSS) patterns. The transition from the first pattern to the second pattern results in the flow oscillation and the side loads peak. The staging motion deviations result in not only the enlarged nozzle side loads, but also a sustained unidirectional effect that may influence the flight stability of the upper stage. An essential ingredient driving the flow unsteadiness and asymmetry is related to the asymmetric reverse supersonic flow deflected by the dome and skirt corner of lower stage. Lastly, the flight data of maximum lateral force during staging of Scout’s stage I and stage II is discussed and compared with the computed results in the article.
    publisherAmerican Society of Civil Engineers
    titleThree-Dimensional Numerical Study of the Conical Nozzle Side Loads during Staging
    typeJournal Paper
    journal volume29
    journal issue5
    journal titleJournal of Aerospace Engineering
    identifier doi10.1061/(ASCE)AS.1943-5525.0000629
    page04016038
    treeJournal of Aerospace Engineering:;2016:;Volume ( 029 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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