平衡风速下十字形伞弹系统姿态摆动分析

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1、第8卷第2期2017年5月航空工程进展ADVANCESINAERONAUTICALSCIENCEANDENGINEERINGV01．8No．2Mav2017文章编号：1674—8190(2017)02—162一09平衡风速下十字形伞弹系统姿态摆动分析刘万刚，叶正寅(西北工业大学航空学院，西安710072)摘要：以一定高度和速度飞行的母弹从其伞弹舱中抛撒伞弹系统群，各个伞弹系统的姿态摆动情况将影响其落点及落角，进而影响其作战效能。采用立式风洞试验和非定常数值仿真(CFD)，分析平衡风速下十字形伞弹系统的姿态摆动情况。通过立式风洞试验，可确定柔性伞的外形、伞弹系统的阻力系数和摆动频率，

2、并创新“拉拽式”试验模型的约束方法；采用基于三维N-S方程的CFX软件，进行伞弹系统非定常数值仿真，分析其摆动机理。结果表明：数值仿真得到的阻力系数、法向力系数、侧向力系数及其摆动频率，均与风洞试验结果相吻合，即数值仿真结果能够反映风洞试验中伞弹系统的摆动情况；伞弹系统的流场极不稳定，伞衣内部有一对方向相反、强度交替变化的旋涡，伞衣外部存在不稳定分离流动，二者相互关联，使得气动参数呈周期性波动，导致伞弹系统的姿态摆动。关键词：十字形伞；空气动力学；稳定性；非定常；伞弹系统中图分类号：V211．5文献标识码：ADOI：10．16615／j．cnki．1674—8190．2017．02

3、．008StudyonAttitudeSwingofCrossParachute—bombSysteminBalancedWindSpeedLiuWangang，YeZhengyin(SchoolofAeronautics，NorthwesternPolytechnicalUniversity，Xi’an710072，China)Abstract：Theprojectilewhichworksinacertainspeedandaltitudethrowsparachute-bombsystem，andswingofparachute-bombsystemsinfluenceint

4、erceptionandimpactangleandattackeffect．Attitudeswingofcrossparachute—bombsysteminbalancedwindspeedisstudiedbytestofverticalwindtunnelandunsteadynumericalsimulation．Theconstraintmethodof‘pulling’ispresentedinthetest，andtheshapeanddragcoefficientandswingfrequencyofparachuteisobtainedbywayofthete

5、st．Onthisbasis，thereasonofparachuteswingisfur—therstudiedbythree-dimensionalunsteadynumericalsimulation．Theresultsindicatethatthecomputationaldragcoefficientandfrequencyofnormalforcecoefficient(1ateralforcecoefficient)isclosetOthatoftheexperi—ment，andtheflowaroundtheparachuteisunsteady．Therear

6、etWOvortices(apairofvortex)，whosedirectionsarecontraryandintensitiesvaryalternatelyintheparachute．Moreover，thereistheunsteadydetachedflowup—ontheparachute．Thevorticesrelatewiththeunsteadydetachedflow．Aerodynamiccoefficientschangeperiodi—tally．Thus，theattitudeoftheparachute-bombsystembecomeunst

7、able．Themethodofwindtunneltestandnumericalsimulationwouldbereferencedinthedesignofsimilarparachute—bombsystem．AndtheconclusioncanprovideatheoreticalbasistOoptimizetheparachute-bombsystem．Keywords：crossparachute；aerodynamics；stability；un