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某长输管线离心压缩机模型级开发 被引量:3
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作者 卢傅安 杨树华 +3 位作者 李靖鑫 杨树鑫 沙龙 郝国帅 《风机技术》 2018年第5期34-41,共8页
基于商业流动分析软件NUMECA,采用Apalart-Allmaras湍流模型以及多重网格方法,对某管线压缩机内部的三维粘性流动进行模拟。根据模拟结果,对叶轮、无叶扩压器、弯道、回流器等部件的结构进行优化,从而实现了这些部件流动涡的控制,大大... 基于商业流动分析软件NUMECA,采用Apalart-Allmaras湍流模型以及多重网格方法,对某管线压缩机内部的三维粘性流动进行模拟。根据模拟结果,对叶轮、无叶扩压器、弯道、回流器等部件的结构进行优化,从而实现了这些部件流动涡的控制,大大降低了这些部件的流动损失,最终完成了某管线压缩机基本级的气动开发。对该管线压缩机模型级进行了性能试验,试验结果表明:在设计马赫数下,该管线压缩机模型级性能曲线CFD预测值与实验值吻合良好。在设计点流量系数下,管线压缩机模型级的多变效率实验值比预测值低0.2%,能头系数实验值比预测值高4.5%。性能曲线形状达到设计预期。 展开更多
关键词 离心压缩机 模型级 数值模拟 管线压缩机 性能试验 叶轮
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Soliton Molecules, Asymmetric Solitons and Hybrid Solutions for(2+1)-Dimensional Fifth-Order Kd V Equation
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作者 Zhao Zhang shu-xin yang Biao Li 《Chinese Physics Letters》 SCIE CAS CSCD 2019年第12期9-12,共4页
Soliton molecules were first discovered in optical systems and are currently a hot topic of research.We obtain soliton molecules of the(2+1)-dimensional fifth-order Kd V system under a new resonance condition called v... Soliton molecules were first discovered in optical systems and are currently a hot topic of research.We obtain soliton molecules of the(2+1)-dimensional fifth-order Kd V system under a new resonance condition called velocity resonance in theory.On the basis of soliton molecules,asymmetric solitons can be obtained by selecting appropriate parameters.Based on the N-soliton solution,we obtain hybrid solutions consisting of soliton molecules,lump waves and breather waves by partial velocity resonance and partial long wave limits.Soliton molecules,and some types of special soliton resonance solutions,are stable under the meaning that the interactions among soliton molecules are elastic.Both soliton molecules and asymmetric solitons obtained may be observed in fluid systems because the fifth-order Kd V equation describes the ion-acoustic waves in plasmas,shallow water waves in channels and oceans. 展开更多
关键词 theory SOLITON SOLITON
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