朱忠攀，林瑞，杜爱民，朱沛沛，袁峥正.汽油机PIV稳态进气试验及滚流比计算[J].内燃机工程,2017,38(4):121-127.
汽油机PIV稳态进气试验及滚流比计算
PIV Steady State Air Intake Experiment and Tumble Ratio Calculation of Gasoline Engines
DOI：
关键词:内燃机  汽油机  PIV试验  进气  滚流比
Key Words:IC engine  gasoline engine  particle image velocimetry (PIV) test  air intake  tumble ratio
基金项目:
作者单位
朱忠攀，林瑞，杜爱民，朱沛沛，袁峥正 同济大学 汽车学院，上海 201804 
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摘要:针对某3缸汽油机，搭建了粒子图像测速（PIV）可视化试验测试系统，并进行缸内流场测量。研究了通过不同流场切面进行滚流比计算的试验方法，并进行了试验与仿真结果的对比。研究结果表明：基于2D3C PIV试验测得的缸内横切面速度场与AVL FIRE软件仿真数据具有较好的一致性，试验与仿真计算的流量系数与滚流比随气门升程的变化趋势吻合，误差在合理范围内。通过2D2C PIV可以测得缸内不同切面的速度场来表征缸内三维的流场变化，其中气门轴对称切面很好地表征了滚流的运动状态，此外，通过一系列PIV测量得出的等间距轴向切面与旋转轴向切面可以拟合横切面的速度场，其速度分布与梯度变化趋势与2D3C测得的速度场相同，但测得滚流比计算值偏小。
Abstract:A visual particle image velocimetry(PIV) test system was set up for the in-cylinder flow field measurement of a 3-cylinder gasoline engine. On this basis a test method for tumble ratio calculation at different flow field cross section was studied, and the test results were compared with the simulation data. Results show that the transversal velocity field in the cylinder measured by 2D3C PIV test is consistent with the simulation data calculated by using AVL FIRE software. Flow coefficient and tumble ratio obtained by test measurements and simulation calculations are in agreement along with the change trend of valve lift, and the error is within a reasonable range. The 2D2C PIV test can be used to measure the velocity field at different cross section of the cylinder to show the variation of the 3D flow field in the cylinder, in which the valve axisymmetric velocity field can be well used to characterize the motion state of the tumble flow. In addition, the transversal velocity field can be synthesized by the equally spaced axial cross-sectional velocity field and rotary axial cross-sectional velocity field measured by a series of PIV measurement. The velocity distributions and the gradient field change trend are the same as that of the transversal velocity field measured by 2D3C PIV test, but the measured tumble flow ratio is smaller than the calculated value.
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