Influence of geometrical factors on steam ejector performance - A numerical assessment
Influence of geometrical factors on steam ejector performance - A numerical assessment
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DOI：
10.1016/j.ijrefrig.2009.05.009
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发表时间：
2009-11-01
期刊：
影响因子：
--
通讯作者：
Diaconu, Bogdan
中科院分区：
文献类型：
--
作者：
Varga, Szabolcs;Oliveira, Armando C.;Diaconu, Bogdan
许多因素影响喷射器的性能。在这项工作中，考虑了三个几何因素--喷嘴与等面积段的面积比（r（A））、喷嘴出口位置（NXP）和等面积段长度（L（m））。利用FLUENT软件建立了蒸汽喷射器的CFD模型，并进行了理论分析.结果表明，存在一个最佳的面积比，这取决于操作条件。因此，一个新的功能，主轴在主喷嘴建议微调的主要流量取决于操作条件。恩智浦的位置会影响卷吸比（lambda）和临界背压（p（c，crit）），在距离喷射器混合段入口平面60 mm处显示出最佳值。L（m）对λ的影响很小;然而，较长的恒定面积部分导致较高的p（c，cjt）。对于最佳设计，确定L（m）= 155 mm的值。(C)2009 Elsevier Ltd和IIR。All rights reserved.
A number of factors influence the performance of an ejector. in this work, three geometrical factors - the area ratio between the nozzle and constant area section (r(A)), nozzle exit position (NXP) and constant area section length (L(m)) - were considered. The theoretical analysis was carried out by a CFD model of a steam ejector using FLUENT. The results indicated the existence of an optimal area ratio, depending on operating conditions. Therefore, a new feature, a spindle in the primary nozzle is suggested to fine tune the primary flow rate depending on operating conditions. The location of NXP influenced both entrainment ratio (lambda) and critical back pressure (p(c,crit)), showing an optimum at 60 mm from the inlet plane of the ejector mixing section. L(m) had little influence lambda; however, longer constant area sections resulted in higher p(c,cjt). For an optimal design, a value of L(m) = 155 mm was identified. (C) 2009 Elsevier Ltd and IIR. All rights reserved.