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An investigation on unsteadiness of a mixed-flow turbine under pulsating conditions

机译：脉动条件下混流式水轮机的不稳定性研究

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The turbocharger is the key enabler for energy conservation in Internal Combustion Engine (ICE). A turbine of a turbocharger is fed by highly pulsating flow due to the reciprocating engine, resulting in different behavior from that at steady conditions. This paper investigates the behavior of a mix-flow turbine under pulsating conditions via an analytical model and an in-house developed 1-D unsteady code ONDAS. Firstly, an analytical model of the 'unsteadiness' based on the mass flow imbalance is built and the mechanism of the unsteady behavior is discussed in details. Next, a 1-D unsteady model of the turbine under pulsating conditions is established and validated by experimental results. Finally, influence of the frequency, the magnitude and their product on unsteady behavior of the turbine is investigated by the reduced order model for further exploration of the analytical model. The investigation clearly demonstrates the impact of pulsating flow on the unsteady performance and unveils the mechanism of the 'unsteadiness' of turbine under pulsating conditions. (C) 2015 Elsevier Ltd. All rights reserved.
机译：涡轮增压器是内燃机（ICE）节能的关键推动力。由于往复式发动机，涡轮增压器的涡轮通过高脉动流供气，从而导致其性能不同于稳定状态。本文通过分析模型和内部开发的一维非稳态代码ONDAS研究了混流式涡轮在脉动条件下的行为。首先，建立了基于质量流失衡的“不稳定”分析模型，并详细讨论了不稳定行为的机理。接下来，建立了脉动条件下涡轮的一维非定常模型，并通过实验结果对其进行了验证。最后，通过降阶模型研究了频率，幅度及其乘积对涡轮机非稳态行为的影响，以进一步探索解析模型。调查清楚地表明了脉动流对不稳定性能的影响，并揭示了在脉动条件下涡轮机“不稳定”的机理。 （C）2015 Elsevier Ltd.保留所有权利。

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