内燃机进气道中流体的时间分辨实验测量和数值模拟检测方案(粒子图像测速)
Modern spark-ignited internal combustion engines have intake ports designed to introduce
high levels of so-called “tumble” charge motion. Correspondingly high shear rates can lead to high
fluctuations and turbulence within the combustion chamber. A suitable test case to characterize the
intake flow is a steady-state flow bench. Although routinely used in the engine development process
to determine the global discharge coefficients, only a few detailed numerical and experimental
studies use this test case to analyze the flow in the vicinity of the valve with high spatial and
temporal resolution. In this paper, we combined highly resolved two-dimensional, two-component
Particle Image Velocimetry (PIV) measurements and numerical simulations using a Detached-Eddy
Simulation (DES) model to characterize engine-relevant flow features on a flow bench. The spatial
resolution of numerical simulations on two different grids is assessed and compared to that of the
PIV measurement. The results of simulations and experiment are then compared in terms of their
mean and fluctuation velocity fields and the jet orientation. A detailed study of the area around the
valve seats investigates the validity of wall functions in this region. Finally, we examine structures
induced by vortex-shedding at the valve stem and if they are transported into the combustion chamber.
检测样品：
汽车电子电器
检测项：
其他
北京欧兰科技发展有限公司
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