Selection and experimental evaluation of low-cost porous materials for regenerator applications in thermoacoustic engines
Selection and experimental evaluation of low-cost porous materials for regenerator applications in thermoacoustic engines
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DOI：
10.1016/j.matdes.2010.06.012
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发表时间：
2011
影响因子：
8.4
通讯作者：
Abdulrahman S. Abduljalil;Zhibin Yu;A. Jaworski
中科院分区：
文献类型：
--
作者：
Abdulrahman S. Abduljalil;Zhibin Yu;A. Jaworski
本文的目的是评估三个选择的低成本的多孔材料的角度来看，他们作为回热器材料在热声行波发动机的设计的适用性。测试的材料包括：具有规则方形通道的蜂窝陶瓷基底;钢“擦洗器”;和不锈钢“羊毛”。与一种广泛使用的蓄热材料：不锈钢编织丝网筛进行了比较。为了进行有意义的比较，选择具有相似水力半径的材料。在水力半径为200 μ m左右设计了一套回热器。这包括陶瓷基底、钢"擦洗器"、不锈钢"羊毛"和堆叠的金属丝网（作为参考）。这套设备还配有钢制"冲刷器"和堆叠的金属丝网（作为参考），水力半径为120 μ m。因此，生产了6台再生器进行试验。最初的测试是在稳定的气流中进行的，以估计由于粘性耗散而引起的相对压降。随后，他们被安装在一个环形管行波热声发动机，以测试其相对性能。测试包括起始温度差、产生的最大压力幅度和声功率输出，声功率输出是大气压以上0到10 bar之间平均压力的函数。看来，由“冲刷器”和钢“羊毛”制成的再生器的性能比具有相同水力半径的筛网再生器差得多。然而，多孔陶瓷可以提供传统蓄热材料的替代品，以降低整体系统成本。提供了详细的讨论。
This paper aims at evaluating three selected low-cost porous materials from the point of view of their suitability as regenerator materials in the design of thermoacoustic travelling-wave engines. The materials tested include: a cellular ceramic substrate with regular square channels; steel “scourers”; and stainless steel “wool”. Comparisons are made against a widely used regenerator material: stainless steel woven wire mesh screen. For meaningful comparisons, the materials are selected to have similar hydraulic radii. One set of regenerators was designed around the hydraulic radius of 200μm. This included the ceramic substrate, steel “scourers”, stainless steel “wool” and stacked wire screens (as a reference). This set was complemented by steel “scourers” and stacked wire screens (as a reference) with hydraulic radii of 120μm. Therefore six regenerators were produced to carry out the testing. Initial tests were made in a steady air flow to estimate their relative pressure drop due to viscous dissipation. Subsequently, they were installed in a looped-tube travelling-wave thermoacoustic engine to test their relative performance. Testing included the onset temperature difference, the maximum pressure amplitude generated and the acoustic power output as a function of mean pressure between 0 and 10bar above atmospheric. It appears that the performance of regenerators made out of “scourers” and steel “wool” is much worse than their mesh-screen counterparts of the same hydraulic radius. However cellular ceramics may offer an alternative to traditional regenerator materials to reduce the overall system costs. Detailed discussions are provided.