Article(id=1227614519434866870, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1227614514896634485, articleNumber=null, orderNo=null, doi=10.16385/j.cnki.issn.1004-4523.2024.04.018, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1665590400000, receivedDateStr=2022-10-13, revisedDate=1672675200000, revisedDateStr=2023-01-03, acceptedDate=null, acceptedDateStr=null, onlineDate=1770615709408, onlineDateStr=2026-02-09, pubDate=1714233600000, pubDateStr=2024-04-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770615709408, onlineIssueDateStr=2026-02-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770615709408, creator=13701087609, updateTime=1770615709408, updator=13701087609, issue=Issue{id=1227614514896634485, tenantId=1146029695717560320, journalId=1225147924628267009, year='2024', volume='37', issue='4', pageStart='539', pageEnd='728', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1770615708325, creator=13701087609, updateTime=1770795248114, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1228367559410512191, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1227614514896634485, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1228367559410512192, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1227614514896634485, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=717, endPage=728, ext={EN=ArticleExt(id=1227614519652970688, articleId=1227614519434866870, tenantId=1146029695717560320, journalId=1225147924628267009, language=EN, title=Research on vibration of rocket engine pipeline of conveying fluid based on two-way fluid-structure interaction, columnId=null, journalTitle=Journal of Vibration Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

Abnormal vibration often occurs in the liquid oxygen kerosene transmission pipeline of the rocket engine,which seriously threatens the safety of the rocket engine. Improper handling will result in a failed rocket launch and enormous economic losses. Therefore,it is necessary to study the vibration of the transmission pipeline. In this paper,a three-dimensional high pressure transmission pipeline model comprising a corrugated pipe,a multi-section bending pipe and other auxiliary structures is established.Using the two-way fluid-solid coupling method,the vibration analysis of the pipeline is performed under external pressure pulse excitation. The accuracy of the computation results is verified by a thermal test. The results show that at the same frequency,the amplitude distribution of vibration acceleration obviously correlates with the amplitude distribution of flow field pressure,which indicates that the fluid pressure fluctuation is the root cause of abnormal vibration of pipeline.And the vibration of pipeline increases with the increase of average pressure. In the visualization results,the location of pipeline vibration is mainly concentrated in the middle pipeline and bellows. The stress and strain of the pipeline are concentrated at the bellows,bends and supports,which is different from the distribution of vibration acceleration. The position with large stress and strain is the dangerous position where the structure is prone to failure,which should be paid more attention to.

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火箭发动机的液氧煤油输送管路经常发生异常振动,严重威胁火箭发动机安全,处理不当将使火箭发射失败,造成巨大经济损失,因此必须对输送管路振动进行研究。本文建立了包含波纹管、多段弯管及其他附属结构的高压输送管路三维模型,采用双向流固耦合方法,在外源压力脉动激励作用下,对管路进行了振动研究,并通过热试车试验验证了计算结果的有效性。分析结果表明,同一频率下,振动加速度的幅值分布与流场压力幅值分布有明显的相关性,表明流体压力脉动是引起管道异常振动的根本原因,且随着平均压力的升高,管道的振动加剧。可视化结果表明,管道振动剧烈位置主要集中在中间管道和波纹管处。波纹管、弯管和支撑处的应力应变值较大,是容易发生结构失效的危险位置,应重点关注。

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宫武旗(1968—),男,博士,教授。 E-mail:
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苏 勇(1991—),男,博士研究生。 E-mail:

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苏 勇(1991—),男,博士研究生。 E-mail:

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Comparison of axial and bending stiffness

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轴向刚度/(N·mm-1弯曲刚度/[N·m·(º)-1]
相对误差2.8%2.9%
仿真值103970279
试验值107000288
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轴向和弯曲刚度比较

, figureFileSmall=null, figureFileBig=null, tableContent=
轴向刚度/(N·mm-1弯曲刚度/[N·m·(º)-1]
相对误差2.8%2.9%
仿真值103970279
试验值107000288
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The vibration acceleration frequency results of different measuring points in three directions

, figureFileSmall=null, figureFileBig=null, tableContent=
测点位置仿真振动频率/Hz试验振动频率/Hz相对误差/%
支撑13353340.2
364036390.02
中间管1201210.8
2282425.8
3353340.2
9009091.0
364036350.1
支撑22412586.6
364036350.1
), ArticleFig(id=1227639794793120015, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227614519434866870, language=CN, label=表2, caption=

仿真和试验不同测点三个方向振动加速度频率结果

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测点位置仿真振动频率/Hz试验振动频率/Hz相对误差/%
支撑13353340.2
364036390.02
中间管1201210.8
2282425.8
3353340.2
9009091.0
364036350.1
支撑22412586.6
364036350.1
), ArticleFig(id=1227639794872811793, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1227614519434866870, language=EN, label=Tab.3, caption=

Flow boundary conditions

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边界类型质量流量/(kg·s-1压力边界/MPa
入口-36+脉动压力
出口17.41-
出口28.24-
出口3112.27-
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流场边界条件

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边界类型质量流量/(kg·s-1压力边界/MPa
入口-36+脉动压力
出口17.41-
出口28.24-
出口3112.27-
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苏勇 1 , 何江 2 , 张淼 2 , 宫武旗 1
振动工程学报 | 2024,37(4): 717-728
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振动工程学报 | 2024, 37(4): 717-728
基于双向流固耦合方法的火箭发动机输流管路振动研究
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苏勇1 , 何江2, 张淼2, 宫武旗1
作者信息
  • 1西安交通大学能源与动力工程学院, 陕西 西安 710049
  • 2中国航天科技集团公司西安航天动力研究所, 陕西 西安 710100
  • 苏 勇(1991—),男,博士研究生。 E-mail:

通讯作者:

宫武旗(1968—),男,博士,教授。 E-mail:
Research on vibration of rocket engine pipeline of conveying fluid based on two-way fluid-structure interaction
Yong SU1 , Jiang HE2, Miao ZHANG2, Wu-Qi GONG1
Affiliations
  • 1School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • 2Science and Technology on Liquid Rocket Engine Laboratory,Xi’an Aerospace Propulsion Institute,Xi’an 710100, China
出版时间: 2024-04-28 doi: 10.16385/j.cnki.issn.1004-4523.2024.04.018
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火箭发动机的液氧煤油输送管路经常发生异常振动,严重威胁火箭发动机安全,处理不当将使火箭发射失败,造成巨大经济损失,因此必须对输送管路振动进行研究。本文建立了包含波纹管、多段弯管及其他附属结构的高压输送管路三维模型,采用双向流固耦合方法,在外源压力脉动激励作用下,对管路进行了振动研究,并通过热试车试验验证了计算结果的有效性。分析结果表明,同一频率下,振动加速度的幅值分布与流场压力幅值分布有明显的相关性,表明流体压力脉动是引起管道异常振动的根本原因,且随着平均压力的升高,管道的振动加剧。可视化结果表明,管道振动剧烈位置主要集中在中间管道和波纹管处。波纹管、弯管和支撑处的应力应变值较大,是容易发生结构失效的危险位置,应重点关注。

火箭发动机  /  输流管路  /  流固耦合  /  高压

Abnormal vibration often occurs in the liquid oxygen kerosene transmission pipeline of the rocket engine,which seriously threatens the safety of the rocket engine. Improper handling will result in a failed rocket launch and enormous economic losses. Therefore,it is necessary to study the vibration of the transmission pipeline. In this paper,a three-dimensional high pressure transmission pipeline model comprising a corrugated pipe,a multi-section bending pipe and other auxiliary structures is established.Using the two-way fluid-solid coupling method,the vibration analysis of the pipeline is performed under external pressure pulse excitation. The accuracy of the computation results is verified by a thermal test. The results show that at the same frequency,the amplitude distribution of vibration acceleration obviously correlates with the amplitude distribution of flow field pressure,which indicates that the fluid pressure fluctuation is the root cause of abnormal vibration of pipeline.And the vibration of pipeline increases with the increase of average pressure. In the visualization results,the location of pipeline vibration is mainly concentrated in the middle pipeline and bellows. The stress and strain of the pipeline are concentrated at the bellows,bends and supports,which is different from the distribution of vibration acceleration. The position with large stress and strain is the dangerous position where the structure is prone to failure,which should be paid more attention to.

rocket engine  /  fluid conveying pipe  /  fluid-structure interaction  /  high-pressure
苏勇, 何江, 张淼, 宫武旗. 基于双向流固耦合方法的火箭发动机输流管路振动研究. 振动工程学报, 2024 , 37 (4) : 717 -728 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.04.018
Yong SU, Jiang HE, Miao ZHANG, Wu-Qi GONG. Research on vibration of rocket engine pipeline of conveying fluid based on two-way fluid-structure interaction[J]. Journal of Vibration Engineering, 2024 , 37 (4) : 717 -728 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.04.018
液体火箭发动机运行过程中,剧烈的流体振荡与固体结构耦合会导致输流管路振动,可能造成结构失效破坏、发动机燃烧不稳定等问题,严重影响发动机的可靠性。随着发动机推力的日益提高,管路承压也越来越高,同时为了降低整体重量,管壁设计也越来越薄,导致管路的流固耦合作用愈发显著,势必严重制约大推力火箭发动机的研究1。因此开展输流管路流固耦合振动特性研究对提升液体火箭发动机动力学认知水平、提高系统稳定性与可靠性具有积极意义。
管道振动在许多领域都很普遍,包括海洋2、核能3、能源工业4-5、船舶6和航空航天7等。目前,各行业研究人员针对固体单场的振动问题开展了大量研究8-11。Jung等12对永磁同步电机的减振方法进行了研究,利用最新设计方法对转子形状进行设计,得到的结构比之前结构的振动位移最大减小88%。Adamkowski等13研究了支撑结构的刚度对管道振动的影响,结果表明刚度增大,管路振动的频率升高,同时振动幅值减小。另外,还有许多研究者研究了布置在振幅较大位置处的局部减振器对管道特定频宽下的振动衰减作用14-16
以上多数研究仅关注固体单场的分析,对多物理场作用下管路产生振动的机制认识不足。实际上,对流场、声场和固体的耦合振动也已有许多研究17-20。Du等21分析了大推力液体火箭发动机燃烧室在强振动试验条件下的结构振动,确定了燃烧室声压与振动信号的耦合特性。通过提高燃烧室结构的刚度对燃烧室的声振耦合模式进行解耦,使热试验时的振动加速度降低了2/3。Wu等22对离心压缩机出口管道的振动问题进行了研究,结果表明,管道固有频率与流体激励频率未出现耦合,管道振动原因是流激声引起的共振。依据仿真的结果在现场安装分流板后,振动幅值减小了32.0%。Zhang等23对诱导轮周围空化流动引起的流致振动进行了数值研究。结果表明,诱导轮空化引起的振动主要表现为一阶弯曲,叶片的最大位移发生在叶尖前缘,从叶尖前缘到叶根逐渐减小。 Liu等24采用流固耦合方法对天然气出站管路振动问题进行了研究。结果表明,管路振动是由于流体激励频率与固体模态频率接近导致,通过增大管径、增加约束,有效地对管路实现了减振。
总之,管道振动问题已经受到越来越多的关注,尤其是研究多场耦合振动问题的流固耦合分析方法也已经日趋成熟25-28,但是对外源激励作用、承高压的火箭发动机液氧煤油输送管路流固耦合振动的研究仍较少,致使管路的振动机理仍不明确。本文采用双向流固耦合方法,以火箭发动机中包含波纹管、多段弯管及其他附属结构的高压输流管路为研究对象,对流场压力、固体模态和流固耦合结果进行分析,研究了管路的振动问题。
流体控制方程由Navier-Stokes方程、湍流输运方程及状态方程组成。控制方程通用形式为29
式中  Sϕ为源项;U为三维坐标上的速度u,v,wρ为流体密度;为通用变量;Γϕ为广义扩散系数。
基于有限体积法求解流场的Navier–Stokes方程。湍流模型采用RNG k-ε模型30。压力和速度耦合计算采用Coupled算法,方程的离散均采用迎风格式,使用中心差分技术对扩散项进行离散。流体介质为液态煤油,在管路中最大流速为45 m/s,煤油中声速为1300 m/s,可得煤油在管路中最大马赫数仅为0.03,未达到需要考虑压缩性的马赫数值31,且高压下液体的密度变化较小32,因此液态煤油计算过程中考虑为不可压缩流体。另外,由于试验过程中介质温度无明显变化,因此不考虑介质煤油的温度变化。
固体瞬态动力学分析求解的基本运动方程为:
式中  M表示质量矩阵;C表示阻尼矩阵;K表示刚度矩阵;表示节点加速度向量;表示节点速度向量;x表示节点位移向量;F表示流体激励力。
固体基于有限元法求解,将连续的求解区域离散成有限个单元,每个单元的位移函数采用多项式形式33。基于变分原理求得单元刚度矩阵,然后将单元内刚度矩阵组装成总刚度矩阵,用于计算整体结构的频率、模态、节点位移等。
流固耦合控制方程组求解方法可概括为:整体求解方法/直接法、分区单向耦合法和分区双向耦合法三类。整体求解方法/直接法将流体域和固体域构造在同一控制方程中,所有变量同时求解,求解精度较高。但是形成的耦合控制方程规模较大,非线性特性较强,求解难度极大。相对于整体求解方法,分区耦合方法将计算域分解为流体域(管内流场)和固体域(管段结构),在同一时间步内分别计算,通过耦合界面的数据传递(管壁流体脉动压力和管壁结构位移)更新流体域的位移边界和结构域的压力边界。分区耦合方法一般分为分区单向耦合法和分区双向耦合法。分区单向耦合法一般研究流场对结构场的单向影响,各时间步耦合界面间数据的传递仅由流场传递到结构场,忽略结构场对流场的影响34。分区双向流固耦合方法中,流体和结构分开计算,在流固耦合面上进行数据交换。流固耦合面上固体接收流体传递的压力,流体接收固体在流体压力作用下反馈的位移。流场求解器通过动网格方法对变形后的网格进行光顺和重构,使其能满足仿真计算的要求,至此完成一个时间步的数据交换与计算。将整个流固耦合过程划分为若干时间步的计算,达到计算停止条件后终止耦合计算35。流固耦合面上流体域和固体域满足如下位移协调方程和力平衡方程2436
式中  表示位移;表示应力;下标分别表示固体和流体。
本文采用双向流固耦合方法,应用ANSYS 2020版商业软件进行计算,流场计算采用Fluent模块,固体计算采用Transient Structural 模块,流场和固体数据交换采用System Coupling 模块,如图 1所示。流体域采用Smoothing动网格方法调整网格。计算时间步长设置为6.25×10-5 s,计算时长为0.11 s。
发动机整体及管路在发动机中位置如图2所示,发动机型号为YF-100,推力120 t级,属于高压补燃的液氧煤油发动机。YF-100被用于长征五号3.35 m直径助推器模块和2.25 m直径助推器模块37。本文研究的管路与一级煤油泵和燃气发生器连接。
为建立符合实际情况的管路模型,在管路安装图、发动机安装详图等图纸的基础上,结合现场调研收集的实际参数,建立了管路三维模型。管路中包含直管、弯管和波纹管三种特征管段。其中波纹管段包含多层波纹管、导流板、摇摆支撑和铠装装置。整个管路简图如图3所示。
管路包含一个介质入口,三个介质出口和两个位置的支撑。通过设置最大网格尺寸,采用四面体生成流场网格。在额定工况下,使用入口-出口1、入口-出口3的压降结果对流场进行网格无关性验证,结果如图4所示。当网格数从410万增加到630万时,压降几乎没有变化,后三种网格数的压降结果最大偏差仅为1.4%,表明410万网格数已满足网格独立性要求,对应最大网格尺寸为4 mm。
通过设置最大网格尺寸,采用3维20节点的Solid186结构单元生成固体网格。以固体网格数对前10阶模态频率的影响进行网格无关性分析,结果如图5所示。网格数大于21万后,固体模态频率无明显变化,为确保计算精度,最终选用的固体网格数为54万,对应最大网格尺寸为5 mm。
划分网格时,在弯管、波纹管处均进行了局部加密,最终流体和固体分别得到了410万和54万网格单元,部分网格示意图如图6所示。
在仿真前以刚度、质量等效原则17对模型进行简化,简化位置如图7。去掉铠装装置,将多层波纹管简化为1层,厚度减薄至原总厚度的3/4。对简化后的波纹管段整体刚度进行了计算,并与试验数据进行比较。在刚度计算时,设定波纹管段一端固支,在另一端分别施加轴向和径向1 mm的位移,以计算对应的载荷,利用载荷可得到相应的轴向刚度和弯曲刚度38
轴向/弯曲刚度仿真值与试验值的对比如表1所示,轴向刚度和弯曲刚度的相对误差分别为2.8%和2.9%,相对误差较小,表明结构简化合理。去掉的铠装装置和波纹管质量仅占整个波纹管段质量的3.1%,占整个管路的比例更小,因此质量变化的影响可以忽略。
流体在管路中以流体激励力的形式作用于管道结构,当激励力的频率与管道固有频率一致时,管路会出现共振。为了分析火箭发动机输流管路的振动原因,对管路流场、固体结构及流固耦合结果进行分析。
为使流固耦合分析结果更加可靠,利用发动机热试车试验对仿真结果的有效性进行验证。在发动机热试车过程中,监测不同位置的振动加速度,如图 8所示。同时监测了管道支撑2附近位置的压力脉动。对比了仿真与试验结果(如图9表2所示)。由于试验与仿真选取的测点位置难以完全一致,而且仿真很难完全模拟热试车真实情况,导致仿真结果与试验存在差异,但是仿真得到的流场压力和振动加速度的主要特征频率结果与试验一致,验证了数值分析模型的有效性。
流场边界条件如表3所示。流场入口为压力,出口为质量流量,计算了无流固耦合流场瞬态结果。入口压力是热试车额定工况下测得的压力数据,去掉均值的脉动压力如图9所示,均值压力为36 MPa。计算中设定时间步长为6.2510-5 s,总时间为0.11 s。在仿真时,沿流向设置7个压力监测点,监测点位置如图10所示。
流场瞬态压力结果如图12所示,时域压力脉动幅值沿流向变化较小。流场压力频域结果去掉了幅值小于50 kPa的频率。监测点4(其他位置的频率特征与该处一致,仅幅值有区别)的频谱结果中特征频率包含116,232,334,908和3641 Hz。
模态计算中设置进出口连接管道法兰、支撑1和支撑2四个固定支撑。管道包含16个螺栓预紧力,结构间的摩擦系数为0.15,管道材料为结构钢。两处摇摆装置及波纹管使用简化后的模型结构。
比较了干模态、湿模态和预应力模态三种固体模态结果,其中干模态仅包含边界条件,不包含流体质量和流体压力;湿模态在边界条件的基础上,考虑流体质量的影响,但不包含流体压力;预应力模态在边界条件的基础上,将流体的稳态压力结果施加至固体接触面,但不考虑流体质量影响。
模态计算比较结果如图13所示。湿模态计算中,流体在管路中静止,只考虑流体质量。文献[39]介绍液体质量使管道模态频率降低,而且对高阶模态频率影响更大。本文得到的湿模态频率相比干模态均出现不同程度的降低,即是由于液体质量的影响。另外,本文研究的管道结构复杂,而且包含四处不同位置的固定支撑和多处螺栓预紧,多种因素影响下管道湿模态的低阶频率相比干模态变化较小。预应力模态是将流体稳态计算得到的压力结果施加至流固接触面,得到的低阶模态频率结果相比干模态和湿模态变化较大。综合分析可知,流体质量对管道低阶模态结果影响较小,流体稳态压力对管道低阶模态结果影响较大,而低阶模态是重点关注点40,因此采用预应力模态进行分析,预应力模态结果如图14所示。
从预应力模态结果可以看出,其中的3阶模态频率为115 Hz、6阶模态频率为242 Hz、9阶模态频率为343 Hz和20阶模态频率为919 Hz,与流场结果中116,232,335和908 Hz的压力频率接近,差值百分比分别为0.8%,4.1%,2.3%和1.2%,固有频率和流场压力频率的差值百分比在共振范围(20%)内,因此管道可能发生共振17
热试车过程中,相关数据通过传感器传输至主控室,主控室进行观测记录,如图15所示。双向流固耦合计算所需的入口压力条件源于主控室记录的数据。流场边界条件与单独流场计算一致,固体的设置与模态计算时一致。时间步长为6.2510-5 s,计算总时间为0.11 s。在计算过程中,监测不同部位的振动加速度数据,监测位置如图8所示;同时保存每一时间步内流场和固体的数据,用于结果可视化分析。
忽略初始不稳定数据后,对3处监测位置的振动加速度数据进行分析。振动加速度频谱结果如图16所示,轴向、径向和切向三个方向的频谱结果中,包含120,228,241,335,908和3640 Hz五个特征频率,其中228 Hz和241 Hz相近,两者差值百分比仅为5.3%,这种偏差与固体结构非线性运动导致的频率漂移相关41-43。因此,228 Hz和241 Hz认为是同一频率。从图16中可以看出,特征频率大于335 Hz后,振动加速度的幅值较小,故不做深入分析。
三个振动频率120,241和335 Hz分别对应于固体的3阶(115 Hz)、6阶(242 Hz)和9阶(343 Hz)模态频率,而流场的特征频率(116,232和335 Hz)与固体的3,6和9阶固有频率相近,因此,固体的振动加速度频率120,241和335 Hz是流体和固体共振产生。
为进一步阐明流场压力引起固体共振的机理,提取每一时间步流固接触面上所有节点的流场压力和固体数据,进行可视化分析。
每个节点的压力和振动加速度均值分布结果如图17所示,振动加速度较大的位置集中在两个波纹管之间的中间管道处。流场压力整体沿流向逐渐减小,但在弯管、波纹管等位置均出现明显压力变化。从均值分布结果可以看出,流场压力和固体振动加速度无明显相关性。
对每个节点的振动加速度和流场压力数据作频谱分析,得到120,241和335 Hz三个频率下振动加速度和压力的幅值分布,如图18所示。120 Hz和241 Hz频率下振动加速度较大的幅值主要在中间管道和波纹管处,335 Hz频率下振动加速度较大的幅值主要在波纹管和靠近出口的直角弯管处。相应频率下流场压力幅值分布中,120 Hz频率下压力较大幅值在靠近出口管道和中间管道处,241 Hz频率下压力较大幅值在中间管道处,335 Hz频率下压力幅值在第二个波纹管附近较大。对比可以看出,120 Hz和241 Hz频率下的振动加速度和压力在中间管道处都有较大的幅值,335 Hz频率下振动加速度和压力在波纹管和弯管处都有较大的幅值。因为支撑2的作用,虽然120 Hz和335 Hz频率下流场压力在靠近出口附近有较大幅值,但是相应频率下振动加速度幅值在靠近出口附近并不大。120,241和335 Hz三个频率下振动加速度在流向第一个波纹管处均有较大幅值,与管道振型和波纹管吸收变形的特性有关44-45
虽然335 Hz频率下流场压力幅值比120和241 Hz下的大,但引起相应频率下振动加速度的幅值却是最小的,120 Hz频率下压力幅值最小,但引起相应频率下振动加速度的幅值最大。可见固体低阶模态频率更易被激发。
从可视化的振动加速度和流场压力结果可以看出,在相同频率下,流场压力与振动加速度的幅值分布有明显的相关性。由综合均值分布结果可知,管道振动加速度与流场压力脉动相关,与压力均值分布无关,表明管道振动是由流场压力脉动引起。依据引起管道振动原因和管道振动剧烈位置,可制定相应的减振措施。
管道应力及应变分布主要受边界条件、流场压力和振动影响,应力及应变结果能直观反映管道容易出现结构失效的位置。等效应力的均值分布如图19所示,应力较大位置主要集中在两处支撑、弯管内侧和波纹管处。除支撑处外,振动加速度幅值较大的120 Hz频率下的应力幅值分布与均值结果类似,如图20所示。由于应变与应力满足线弹性关系,因此应变分布结果与应力类似。应力及应变较大位置是容易出现结构失效的危险位置,应重点关注。
使用热试车试验时发动机稳定运行的小工况、额定工况和大工况下的入口压力数据作为流场入口边界,研究压力对流固耦合振动的影响。三种工况的平均压力分别为23.7,36和38.6 MPa。监测中间管道处的振动加速度结果,比较结果如图21所示。可以看出,压力越大,管道振动的最大幅值越大,即管道振动越剧烈。
本文通过对火箭发动机液氧煤油输送管路的双向流固耦合数值模拟,研究了管道振动。综合分析了管道流场、固体模态和流固耦合结果,并对流固耦合结果进行可视化,论述了管道振动机理。主要结论如下:
(1)管道内流体压力脉动是引起管道振动的根本原因。管道内流体压力频率、管道固有频率和管道振动加速度频率相近,而且同一频率下,振动加速度的幅值分布与流场压力幅值分布有明显相关性,表明管道振动由管内流场压力脉动引起。
(2)可视化结果表明,管道振动剧烈位置主要集中在中间管道和波纹管处。流场压力均值分布与振动加速度分布无关。另外,随着管道中的平均压力升高,管道的振动加剧。
(3)波纹管、弯管和支撑处的应力和应变值较大,是容易出现结构失效的危险位置,应重点关注。管道振动产生原因、流场压力幅值分布和应力应变分布为下一步提出有效减振措施和管道的安全性评估提供了支撑。
  • 中国航发四川燃气涡轮研究院稳定支持项目(GJCZ-0013-19)
  • 国家科技重大专项(2017-V-0012-0064)
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doi: 10.16385/j.cnki.issn.1004-4523.2024.04.018
  • 接收时间:2022-10-13
  • 首发时间:2026-02-09
  • 出版时间:2024-04-28
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  • 收稿日期:2022-10-13
  • 修回日期:2023-01-03
基金
中国航发四川燃气涡轮研究院稳定支持项目(GJCZ-0013-19)
国家科技重大专项(2017-V-0012-0064)
作者信息
    1西安交通大学能源与动力工程学院, 陕西 西安 710049
    2中国航天科技集团公司西安航天动力研究所, 陕西 西安 710100

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宫武旗(1968—),男,博士,教授。 E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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