• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Symposium on Transport Phenomena and Dynamics of Rotating Machinery >Challenges of Turbocharging a Two-Cylinder Engine - A Computational Analysis of a Turbocharger Turbine by Transient CFD Methods
【24h】

Challenges of Turbocharging a Two-Cylinder Engine - A Computational Analysis of a Turbocharger Turbine by Transient CFD Methods

机译：涡轮增压涡轮增压的挑战 - 通过瞬态CFD方法进行涡轮增压器涡轮机的计算分析

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Drive train development is facing demands for reduced emissions and growing expectations for driving dynamics coupled with declining fuel consumption. Downsizing in combination with turbocharging is a key technology to ensure increased power density and efficiency, at reduced emission levels. Up to now, quasi-steady behavior of the turbocharger has been assumed in the turbocharger design. However, the inflow conditions for radial turbines are actually quite different for real pulsating engine operations, compared to steady and quasi-steady conditions [1]. The aim of reducing the fuel consumption with fewer cylinders leads to a further change in the boundary conditions for the turbocharger [7]. As a result, the quasi-steady behavior, especially in two cylinder engines, does not seem to be valid and this has to be taken into account during the design process [2], [3]. This paper presents a numerical investigation of a pulse charged turbocharger turbine to gain an understanding of the aerodynamics at different pulse frequencies. A validated CFD-model is used to compute two and four-cylinder pulses. The time dependent boundary conditions for pressure and temperature are generated via 1D simulation. To make both pulse frequencies comparable, the turbine simulations were run with the same specific exhaust cycle enthalpy. The analyses of the results shows a significant deterioration of the turbine operating behavior at low end torque due to the pulsating inflow of a two cylinder pulse compared to a four cylinder pulse. Higher engine speeds reduce the disadvantages. Furthermore it can be shown that the storage effect of the volute and the phase shift in temperature and pressure influences the throughput behavior of the turbine. For that the specific pulsating flow conditions must be considered for an optimization of the turbocharger of a two-cylinder engine.
机译：驱动火车开发面临着降低排放和促进动力学的预期需求，加上燃料消耗下降。与涡轮增压结合的缩小化是一种关键技术，以确保在减少的发射水平下增加功率密度和效率。到目前为止，在涡轮增压器设计中假设了涡轮增压器的准稳定行为。然而，与稳定和准稳定的条件相比，径向涡轮机的流入条件实际上对于真正的脉动发动机操作实际上是完全不同的。用较少的汽缸减少燃料消耗的目的导致涡轮增压器的边界条件的进一步变化[7]。结果，准稳态行为，特别是在两个气缸发动机中，似乎没有有效，并且在设计过程中必须考虑到这一点[2]，[3]。本文提出了对脉冲带电的涡轮增压器涡轮机的数值研究，以了解不同脉冲频率的空气动力学的理解。经过验证的CFD模型用于计算两个和四缸脉冲。通过1D仿真产生压力和温度的时间依赖边界条件。为了使两个脉冲频率相当，涡轮模拟用相同的特定排气循环焓运行。结果的分析表明，与四缸脉冲相比，由于两个气缸脉冲的脉动流入，所以在低端扭矩下的涡轮机操作行为的显着劣化。更高的发动机速度降低了缺点。此外，可以示出蜗壳的储存效果和温度和压力的相移影响了涡轮机的产量行为。为此，必须考虑特定的脉动流动条件，以优化两个气缸发动机的涡轮增压器。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号