压力容器
壓力容器
압력용기
2014年
5期
41-45
,共5页
扭曲管%管板%有限元%应力强度
扭麯管%管闆%有限元%應力彊度
뉴곡관%관판%유한원%응력강도
twisted tube%tubesheet%finite element analysis%stress intensity
采用有限元分析软件ANSYS，对扭曲管换热器的管板在三种工况下的应力进行计算，分析了扭曲管轴向刚度削弱系数对管板应力强度及扭曲管轴向应力的影响。结果表明，扭曲管的轴向变形补偿能力优于普通直管，可以降低在温差载荷作用下管板中的应力，但会提高压力作用下的管板应力。在压力载荷作用下，扭曲管上的平均应力大小与普通直管差别不大，但扭曲管的轴向应力在管子横截面上的分布不均匀，局部的轴向应力远远高于平均应力水平，因此扭曲管抗疲劳和应力腐蚀开裂的能力不如直管。不同厚度的管板受扭曲管管束轴向刚度的影响不同，当管板厚度较小时，扭曲管管束轴向刚度的影响较大。
採用有限元分析軟件ANSYS，對扭麯管換熱器的管闆在三種工況下的應力進行計算，分析瞭扭麯管軸嚮剛度削弱繫數對管闆應力彊度及扭麯管軸嚮應力的影響。結果錶明，扭麯管的軸嚮變形補償能力優于普通直管，可以降低在溫差載荷作用下管闆中的應力，但會提高壓力作用下的管闆應力。在壓力載荷作用下，扭麯管上的平均應力大小與普通直管差彆不大，但扭麯管的軸嚮應力在管子橫截麵上的分佈不均勻，跼部的軸嚮應力遠遠高于平均應力水平，因此扭麯管抗疲勞和應力腐蝕開裂的能力不如直管。不同厚度的管闆受扭麯管管束軸嚮剛度的影響不同，噹管闆厚度較小時，扭麯管管束軸嚮剛度的影響較大。
채용유한원분석연건ANSYS，대뉴곡관환열기적관판재삼충공황하적응력진행계산，분석료뉴곡관축향강도삭약계수대관판응력강도급뉴곡관축향응력적영향。결과표명，뉴곡관적축향변형보상능력우우보통직관，가이강저재온차재하작용하관판중적응력，단회제고압력작용하적관판응력。재압력재하작용하，뉴곡관상적평균응력대소여보통직관차별불대，단뉴곡관적축향응력재관자횡절면상적분포불균균，국부적축향응력원원고우평균응력수평，인차뉴곡관항피로화응력부식개렬적능력불여직관。불동후도적관판수뉴곡관관속축향강도적영향불동，당관판후도교소시，뉴곡관관속축향강도적영향교대。
Finite element analysis with the software ANSYS was performed on the tubesheet of a twisted tube heat exchanger under three loading cases.Effects of the axial stiffness of the twisted tubes on the strength of the tubesheet were investigated.It is found that as the axial deformation compensation of the twisted tubes is better than that of the plain straight tube,stresses at the tubesheet are decreased when using twisted tubes under the thermal loading,but the stresses are increased under the pressure loadings. Although the average axial stress at the twisted tubes is almost the same as that at the straight tubes,the stress distribution at the cross section of the twisted tubes is not uniform and the maximum stress is much larger than the average stress,which implies that ability of the twisted tubes to resist fatigue or stress cor-rosion cracking is much weaker than the straight tubes.For different thickness of the tubesheet,the effect of the axial stiffness of the twisted tubes is different.The smaller the thickness of the tubesheet,the stron-ger the effect is.
