【摘要】 应用PIV技术对在柴油机进行缸内流场测试中,将原排气门座改为拍照用视窗。基于对开设视窗位置的选择和保证柴油机按照配气定时准确运行的考虑,在试验中设计使用了一种新排气控制方法:将准备改动的排气门部位,以排气门杆为中心,水平旋转180°移至气缸盖外,并配制了相应的支持部件。与此类试验中常用的由电磁阀或弹簧滑块的开闭控制柴油机排气的方法相比,系统完全依照原排气凸轮的规律运行,避免了使用电磁阀或弹簧滑块方法所需要的对排气系统运动规律进行验证的大量试验和计算。更多还原

【Abstract】 When using the PIV technique in the flow field test of a cylinder,for convenient to take photos of the tracer element in the flow field,the exhaust valve was usually got rid and a window for observation was made substituting.In consideration of the window position and the valve timing,it designed a new scheme: namely the exhaust valve and the rocker were turned by 180 degree along the tappeat at the same level,and the related accessory was designed.This new scheme was simple and easy to made.Comparison with the common treatment,the method could simply keep the valve timing of the original engine and much experiments and computations for the cam motion principle in the the electromagnetic valve or the spring-slide method were avoid.更多还原