Analysis on altitude adaptability of turbocharging systems for a heavy-duty diesel engine
Analysis on altitude adaptability of turbocharging systems for a heavy-duty diesel engine
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DOI：
10.1016/j.applthermaleng.2017.09.065
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发表时间：
2018-01-05
影响因子：
6.4
通讯作者：
Zhang, Yangjun
中科院分区：
文献类型：
--
作者：
Yang, Mingyang;Gu, Yuncheng;Zhang, Yangjun
本文旨在了解几种广泛应用的单级涡轮增压系统在海拔高度适应性上的差异，并提出一种不同海拔高度下的性能评估和增压器-发动机匹配方法。采用实验验证的仿真方法，对一台6缸v型涡轮增压重型柴油机进行了研究。结果表明，在不同海拔高度，发动机功率回收的工作区域有三个极限，即最大气缸压力、涡轮增压器转速和排气温度。对作战区域进行了海拔适应性评估和不同海拔下增压器与发动机的匹配研究。讨论了涡轮有效流道面积和增压器效率对运行边界的影响。结果表明，对进气质量流量和燃油裕度的影响是影响边界的根源。最后，基于工作区域理论，对四种涡轮增压系统（固定几何、双废门和变几何）进行了比较。结果表明，变几何涡轮增压（VGT）在最大高度、功率回收和BSFC方面具有最佳的高度适应性。它的优势来自于涡轮面积变化的能力和更高效率的潜力。通过研究，得出了一种适合海拔适应性的增压器-发动机优化匹配方法。(C) 2017 Elsevier Ltd.版权所有。
This paper aims to understand discrepancies of altitude adaptability among several widely applied single-stage turbocharging systems, and to develop a method of performance evaluation and turbocharger-engine matching at different altitudes. The investigation is carried out on a 6-cyclinder V-type turbocharged heavy-duty diesel engine via experimentally validated simulation method. It is concluded that the operational region with engine power recovery at different altitudes is bounded by three limits, which are the maximum cylinder pressure, turbocharger speed and exhaust temperature. The operational region is studied for the evaluation of altitude adaptability and turbocharger-engine matching at different altitudes. The influence of the turbine effective flow area and turbocharger efficiency on the operational boundaries are discussed. It is concluded that the influence on the intake mass flow rate and fuel margin is the root for the influence on the boundaries. At last, comparisons among four turbocharging systems (a fixed geometry, two waste-gate and a variable geometry) are carried out based on the theory of the operational region. Results show that the variable geometry turbocharging (VGT) has the best altitude adaptability with regard to the maximum altitude with power recovery and BSFC. Its superior results from the capability of turbine area variation as well as the potential for higher efficiency. A method of optimized turbocharger-engine matching tailored for altitude adaptability are obtained from the investigation. (C) 2017 Elsevier Ltd. All rights reserved.