方案摘要
方案下载应用领域 | 汽车及零部件 |
检测样本 | 汽车电子电器 |
检测项目 | 其他>其他 |
参考标准 | 暂无 |
利用德国LaVision公司的层析粒子成像测速(Tomo-PIV)和时间分辨粒子成像测速(TR-PIV)系统,测量汽车活塞发动机内部瞬态湍流场并和理论分析预测结果进行比对。
Planar particle image velocimetry (PIV) and tomographic PIV (TPIV) measurements
are utilized to analyze turbulent statistical theory quantities and the instantaneous
turbulence within a single-cylinder optical engine. Measurements are performed
during the intake and mid-compression stroke at 800 and 1500 RPM. TPIV
facilitates the evaluation of spatially-resolved Reynolds stress tensor (RST) distributions,
anisotropic Reynolds stress invariants, and instantaneous turbulent vortical
structures. The RST analysis describes distributions of individual velocity fluctuation
components that arise from unsteady turbulent flow behavior as well as cycle-to-cycle
variability (CCV). A conditional analysis, for which instantaneous PIV images are
sampled by their tumble center location, reveals that CCV and turbulence have similar
contributions to RST distributions at the mean tumble center, but turbulence
is dominant in regions peripheral to the tumble center. Analysis of the anisotropic
Reynolds stress invariants reveals the spatial distribution of axisymmetric expansion,
axisymmetric contraction, and 3D isotropy within the cylinder. Findings indicate
that the mid-compression flow exhibits a higher tendency toward 3D isotropy than
the intake flow. A novel post-processing algorithm is utilized to classify the geometry
of instantaneous turbulent vortical structures and evaluate their frequency of occurrence
within the cylinder. Findings are coupled with statistical theory quantities to
provide a comprehensive understanding of the distribution of turbulent velocity components,
the distribution of anisotropic states of turbulence, and compare the turbulent
vortical flow distribution that is theoretically expected to what is experimentally
observed. The analyses reveal requisites of important turbulent flow quantities and
discern their sensitivity to the local flow topography and engine operation.
在一个双稳湍流涡旋火焰中,对间歇性动态的时间-频率定位
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
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