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Effect of inter-stage phenomena on the performance prediction of two-stage turbocharging systems

机译：级间现象对二级涡轮增压系统性能预测的影响

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The paper investigates accuracy of performance measurement in two-stage turbocharging systems, due to aero-thermal inter-stage phenomena. A novel methodology to measure performance of turbochargers into equivalent maps has been implemented, for mapping of turbocharging systems in steady turbocharger gas-stands. The comparison of equivalent maps and stand-alone high and low pressure turbochargers maps is performed, via single maps combinations. In this scenario, two-stage system performance are calculated on the basis of single stages variables in a simplified map-based one-dimensional code. In order to quantify the influence of heat transfer in turbochargers on the two-stage turbocharging system, diabatic and adiabatic turbochargers maps with heat corrections for each stage ares implemented. In conclusion, in comparison to equivalent two-stage maps, combined stand-alone maps predict a significantly higher pressure ratio and efficiency at compressors, due to low speed maps extrapolation. Meanwhile, the turbine net efficiency is missed by about 10% at elevated corrected mass flow operations, due to underestimation of swallowing capacity and isentropic expansion in the combined map approach. (c) 2017 Elsevier Ltd. All rights reserved.
机译：本文研究了由于空气热级间现象而在两级涡轮增压系统中进行性能测量的准确性。已经实施了一种将涡轮增压器性能测量为等效图的新颖方法，用于在稳定的涡轮增压器加气站中绘制涡轮增压系统。等效图和独立的高压和低压涡轮增压器图通过单个图组合进行比较。在这种情况下，在简化的基于地图的一维代码中，基于单级变量来计算两级系统性能。为了量化涡轮增压器中的热传递对两级涡轮增压系统的影响，实现了绝热和绝热涡轮增压器图，并对每一级进行了热校正。总之，与等效的两阶段映射相比，由于低速映射外推，组合的独立映射可预测压缩机处的压力比和效率显着提高。同时，由于在组合图法中低估了吞咽能力和等熵膨胀，因此在提高的校正质量流量操作下，涡轮机净效率降低了约10％。 （c）2017 Elsevier Ltd.保留所有权利。

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