Numerical Study of the Effect of In-Cylinder Airflow Disturbances on Intermediate Species Sampling in the Rapid Compression Machine

WU Yingtao; RAO Boxuan; TANG Chenglong; HUANG Zuohua

doi:10.7652/xjtuxb202408007

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Numerical Study of the Effect of In-Cylinder Airflow Disturbances on Intermediate Species Sampling in the Rapid Compression Machine

更新时间：2025-07-28

- Numerical Study of the Effect of In-Cylinder Airflow Disturbances on Intermediate Species Sampling in the Rapid Compression Machine
- Vol. 58, Issue 8, Pages: 60-68(2024)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202408007
  CLC： TK16
- Online First：10 August 2024，
  
  Published：2024
- 稿件说明：
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WU Yingtao, RAO Boxuan, TANG Chenglong, et al. Numerical Study of the Effect of In-Cylinder Airflow Disturbances on Intermediate Species Sampling in the Rapid Compression Machine[J]. 2024, 58(8): 60-68.
DOI：

WU Yingtao, RAO Boxuan, TANG Chenglong, et al. Numerical Study of the Effect of In-Cylinder Airflow Disturbances on Intermediate Species Sampling in the Rapid Compression Machine[J]. 2024, 58(8): 60-68. DOI： 10.7652/xjtuxb202408007.

摘要

针对燃料自燃活性表现出负温度系数(NTC)效应时的快速压缩机缸内流场扰动对物种采样精度影响不明的问题

建立了燃料自燃过程物种采样的数值模型

通过控制活塞缝隙容积在燃烧缸内产生了不同强度的气流扰动

探究了NTC及气流扰动共同作用对正丁烷混合气自燃过程物种采样精度的影响规律。研究结果表明:受燃料NTC效应的影响

两种典型的物种采样方法均出现了反向稀释现象

即燃料的采样浓度偏低

中间产物的采样浓度偏高。反向稀释与采样方法的系统误差产生抵消

导致NTC区域内物种采样精度受气流扰动的敏感性降低。抑制燃烧缸内的气流扰动有利于提高采样精度

然而在绝对无扰动的流场下

整体冻结法的采样误差受热边界层作用反而会略微提高。该研究为燃料自燃过程中物种采样实验的设计及数据不确定性分析提供了有价值的参考。

Abstract

The effect of in-cylinder airflow disturbances in the rapid compression machine on the species sampling accuracy remains unclear when fuel autoignition exhibits a negative temperature coefficient(NTC)effect. To solve this problem

this study establishes a numerical model for species sampling during fuel autoignition

and delves into the combined effect of NTC and airflow disturbances on the species sampling accuracy during the autoignition of a n-butane mixture

by controlling different piston crevice volumes to generate airflow disturbances of different intensities within the combustion chamber. The results show that due to the NTC effect of the fuel

both of the typical sampling methods exhibit a reverse dilution phenomenon

where the sampling concentration of the fuel is lower than expected

while that of intermediate species is higher than expected. This reverse dilution offsets the systematic errors of the sampling methods

resulting in a reduced sensitivity of the species sampling accuracy to airflow disturbances in the NTC region. Suppressing airflow disturbances within the combustion chamber is generally beneficial to the increase in the sampling accuracy. However

in an absolutely undisturbed flow field

the sampling error of the whole quenching method may even increase slightly due to the effect of the thermal boundary layer. This study provides valuable reference for the design of species sampling experiments and the uncertainty analysis of experimental data during fuel autoignition.

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