固体火箭技术
固體火箭技術
고체화전기술
JOURNAL OF SOLID ROCKET TECHNOLOGY
2010年
1期
9-12
,共4页
崔小强%白晓征%周伟%刘君
崔小彊%白曉徵%週偉%劉君
최소강%백효정%주위%류군
激波%弹性裂纹%分段精细时程积分法%非结构动网格%流固耦合
激波%彈性裂紋%分段精細時程積分法%非結構動網格%流固耦閤
격파%탄성렬문%분단정세시정적분법%비결구동망격%류고우합
shock wave%elastic crack%subsection precise time-integration method%dynamic unstructured grid%fluid-structure interaction
流体计算采用基于非结构动网格的有限体积方法,结构计算采用分段精细时程积分方法,求解结构动力学有限元方程,流体计算和固体计算之间采用松耦合在不断运动的交界面上进行作用力和运动特性的传递,对固体火箭发动机点火形成的冲击波与药柱缺陷形成的弹性裂纹之间相互耦合作用过程进行了模拟.研究表明,作用在弹性裂纹上的冲击波载荷引起的壁面变形随时间变化明显,开始表现为撑开裂纹出口,随后出现了收缩出口撑开底部的瓶状;固体变形对冲击波在弹性狭缝内的压力波振荡影响较小,以前采用刚体模型得到的研究结论仍有指导意义.
流體計算採用基于非結構動網格的有限體積方法,結構計算採用分段精細時程積分方法,求解結構動力學有限元方程,流體計算和固體計算之間採用鬆耦閤在不斷運動的交界麵上進行作用力和運動特性的傳遞,對固體火箭髮動機點火形成的遲擊波與藥柱缺陷形成的彈性裂紋之間相互耦閤作用過程進行瞭模擬.研究錶明,作用在彈性裂紋上的遲擊波載荷引起的壁麵變形隨時間變化明顯,開始錶現為撐開裂紋齣口,隨後齣現瞭收縮齣口撐開底部的瓶狀;固體變形對遲擊波在彈性狹縫內的壓力波振盪影響較小,以前採用剛體模型得到的研究結論仍有指導意義.
류체계산채용기우비결구동망격적유한체적방법,결구계산채용분단정세시정적분방법,구해결구동역학유한원방정,류체계산화고체계산지간채용송우합재불단운동적교계면상진행작용력화운동특성적전체,대고체화전발동궤점화형성적충격파여약주결함형성적탄성렬문지간상호우합작용과정진행료모의.연구표명,작용재탄성렬문상적충격파재하인기적벽면변형수시간변화명현,개시표현위탱개렬문출구,수후출현료수축출구탱개저부적병상;고체변형대충격파재탄성협봉내적압력파진탕영향교소,이전채용강체모형득도적연구결론잉유지도의의.
The fluid-structure interaction between ignition shock wave and elastic cracks of grain in SliM was investigated nu-merically by using loose coupling method. Finite volume method was adopted in fluid calculation on dynamic unstructured grid within an Arbitrary Lagrangian-Eulerian (ALE) framework, while the subsection precise time-integration method was used to solve the structure dynamic equations. In each time step, the data of pressure in fluids and displacement in structures were exchanged at the interface. The results show that deformation on the surface of the grain is visible because of the pressure load on the crack. The exit of the crack expands firstly, and then shrinks, and the bottom of crack expands, while the shape of the crack is just like a bottle. Pressure oscillation in the crack is influenced by the structure deformation slightly, so that the research conclusion on rigid-body as-sumption is stir significative.