Unsteady performance analysis of a twin-entry variable geometry turbocharger turbine
Unsteady performance analysis of a twin-entry variable geometry turbocharger turbine
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DOI：
10.1016/j.energy.2011.12.017
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发表时间：
2012-02-01
期刊：
影响因子：
9
通讯作者：
Martinez-Botas, Ricardo F.
中科院分区：
文献类型：
--
作者：
Rajoo, Srithar;Romagnoli, Alessandro;Martinez-Botas, Ricardo F.
本文详细讨论了车用涡轮增压器用双进气变几何涡轮的非定常试验和分析。本研究中的涡轮机是从商用无喷嘴机组到单入口可变几何结构，进而到双入口机组的设计进步的产物。涡轮机的主要特征在所有配置中保持相似，以便进行等效比较。双进汽轮机的非定常曲线表现出传统的表现充填和排空效应的环路特性，无喷嘴和单进汽轮机的情况也是如此。在完全进气试验期间，双入口涡轮的吞吐能力被记录为两个入口之间的不一致，特别是它们处于不同的压力比水平--在大多数情况下，护罩端入口比轮毂端入口的压力更大，高达13%。相反，在异相测试期间，发现两个涡轮入口的吞吐能力是相似的。结果表明，有喷嘴涡轮的循环平均效率与当量准稳态相比有很大的偏离，与无喷嘴涡轮相比，这一偏差高达32%。(C)2011爱思唯尔有限公司。保留所有权利。
This paper discusses the details of unsteady experimentation and analysis of a twin-entry variable geometry turbine for an automotive turbocharger. The turbine in this study is the product of design progression from a commercial nozzleless unit to a single-entry variable geometry and consequently to a twin-entry unit. The main features of the turbine were kept similar across all configurations for equivalent comparison basis. The unsteady curves of the twin-entry turbine exhibited the conventional looping characteristics representing filling and emptying effects, which was also the case for the nozzleless and single-entry nozzled turbine. The swallowing capacity of the twin-entry turbine, during full admission testing, was recorded to be inconsistent between the two entries, in particular they were at different pressure ratio levels - the shroud end entry was in most cases more pressurized compared to the hub end entry, as much as 13%. Contrarily, during out-of-phase testing the swallowing capacity of both the turbine entries was found to be similar. The cycle-averaged efficiency of the nozzled turbine either twin or single-entry was found to depart significantly from the equivalent quasi-steady, in comparison to the nozzleless single-entry turbine, this was as much as 32%. (C) 2011 Elsevier Ltd. All rights reserved.