共查询到18条相似文献,搜索用时 125 毫秒
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环路声学共振多级行波热声发动机的机理研究 总被引:1,自引:0,他引:1
针对环路声学共振多级行波热声发动机的工作机理进行了研究,重点分析了环路声学共振4级行波热声发动机无负载工作情况,并比较了环路声学共振4级、8级、16级行波热声发动机的工作性能。计算结果表明,这一行波热声发动机具有较好的声场分布并通过增大回热器横截面积有效降低了回热器内的粘性流动损失。增加环路声学共振多级行波热声发动机的级数仍能获得较为理想的工作性能,并能够增加整机产生净声功率,降低谐振管消耗声功率的比例,相对传统带驻波谐振管的行波热声发动机更为紧凑。 相似文献
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基于环形圈加谐振管的热声发动机的两自由度模型构思,在调相机理上开展了工作.系统分析和仿真研究表明:谐振管对于热声发动机系统不仅是决定系统工作频率、储能和稳定工况,还对行波型热声发动机的声场产生调相作用.针对不同形式的谐振管(谐振管,谐振腔和容腔),以及不同体积的容腔负载(10 L,20 L,40 L)进行仿真计算.研究不同条件下,对回热器处的压力和体积流率之间的相位调节作用及声功的影响.在此基础上,对回热器起点、中点和终点3个位置的流体微团进行分析,得到不同位置的p-V图.结果表明,谐振管的确起到调节声场相位的作用,容腔形式的谐振管更有利于回热器内声场的优化,而容腔的体积大小对回热器声场的影响不大. 相似文献
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通过波动方程建立了多分支赫歇尔-昆克(Herschel-Quincke,HQ)管的传声损失模型,该模型可计算包含任意数量、不同管径和不同管长组合的HQ管模型。通过与前人的计算结果进行比较,验证了该方法的有效性。并通过数值计算,分析讨论了不同参数(如HQ管的长度和直径、HQ管分支数量)对多分支HQ管传声损失的影响。结果表明:在总横截面积相等的情况下,多分支HQ管吸声性能与单分支HQ管相同;改变管道的长度可以改变共振频率;比较频率平均传声损失,HQ管长度不统一的结构的声学特性优于长度统一的结构。 相似文献
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A resonance tube is an important component of a thermoacoustic engine, which has great influence on the performance of the thermoacoustically driven pulse tube refrigerator. A standing wave thermoacoustic engine is simulated with linear thermoacoustics. Computed results show that an appropriate accretion of the resonance tube length may lead to a decrease of the working frequency and an increase of the pressure amplitude, which will improve the match between the thermoacoustic engine and the pulse tube refrigerator. The theoretical prediction is verified by experiments. A refrigeration temperature as low as 88.6 K has been achieved with an optimized length of the resonance tube, helium as working gas, and 2200 W of heating power. 相似文献
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穿孔管消声器消声性能的有限元计算及分析 总被引:7,自引:0,他引:7
使用有限元法计算穿孔管消声器的传递损失,并与实验测量结果进行了比较,二者吻合良好。穿孔率 相同而孔径不同的两个穿孔管消声器的传递损失与具有相同直径和长度的简单膨胀腔消声器的传递损失比较表 明,穿孔管对消声器的低频性能影响较小,而对中频消声性能影响很大、对高频消声性能影响有限。 相似文献
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Two standing-wave thermoacoustic engines with a constant-diameter resonant tube and a tapered one, respectively, are simulated with linear thermoacoustics to explore the reasons for performance improvement of the thermoacoustic engine with the tapered resonant tube substituting for the constant-diameter one. Computed results indicate that the viscous loss in the tapered resonant tube is much lower than that in the constant-diameter one, and the smooth joint between the tapered resonant tube and its resonant cavity may avoid the acoustic power loss derived from sharp variation of flow area. The comparison between the computed results and the experimental data indicates that the simulation can roughly predict the performance of thermoacoustic engines with these two types of resonant tubes. 相似文献