A new steady flow test bench test facility has been designed and fabricated for exploration of complex three-dimensional flowfields inside a cylinder of an internal combustion engine. An engine cylinder head of a currently produced car engine with four head valves is utilized as an inlet section of the newly built test bench test. No piston is located in the cylinder and the intake valves are not periodically operated. They remain open during the test periods. An extensive set of initial experimental data has been acquired for both open intake valves and for the location of the probes at two different axial stations in the engine cylinder. The experimental technique of thermo-anemometer split-fiber probes is employed in this research work, which is a novelty never applied before to this class of flows. The probe properties are explained in the paper with emphasis on the probe directional characteristics. The verification tests proved the operational readiness of the new test bench to acquire reliable experimental data at a range of flow conditions simulating real engine settings. The acquired data set base will be used for validations of improved CFD engine design codes. An analysis of the initial set of experimental data clearly indicates that two vortices, or more likely down-flowing spiral flow structures. are present side by side in the cylinder. Mutual interaction of these two flow structures and the ability to generate faithful numerical simulation of this flow pattern for additional planes of measurement and various valve openings will be reported separately.

设计并制造了一种新的稳流试验台试验设备，用于探索内燃机气缸内复杂的三维流场。新建成的试验台试验的进气段采用目前生产的四缸汽门发动机的发动机气缸盖。气缸中没有活塞，进气门也没有定期操作。它们在测试期间保持打开状态。已经为打开的进气门和发动机气缸中两个不同轴向站的探头位置获得了一组广泛的初始实验数据。这项研究工作采用了热风速计分裂光纤探头的实验技术，这是以前从未应用于此类流动的新颖之处。论文中解释了探头特性，重点是探头方向特性。验证测试证明了新测试台可以在模拟真实发动机设置的一系列流动条件下获取可靠的实验数据。获得的数据集库将用于验证改进的 CFD 发动机设计规范。对初始实验数据集的分析清楚地表明存在两个涡流，或更可能是向下流动的螺旋流结构。并排存在于气缸中。这两种流动结构的相互影响以及为额外的测量平面和各种阀门开口生成这种流动模式的真实数值模拟的能力将分别报告。验证测试证明了新的测试台可以在模拟真实发动机设置的一系列流动条件下获取可靠的实验数据。获得的数据集库将用于验证改进的 CFD 发动机设计规范。对初始实验数据集的分析清楚地表明存在两个涡流，或更可能是向下流动的螺旋流结构。并排存在于气缸中。这两种流动结构的相互影响以及为额外的测量平面和各种阀门开口生成这种流动模式的真实数值模拟的能力将分别报告。验证测试证明了新测试台可以在模拟真实发动机设置的一系列流动条件下获取可靠的实验数据。获得的数据集库将用于验证改进的 CFD 发动机设计规范。对初始实验数据集的分析清楚地表明存在两个涡流，或更可能是向下流动的螺旋流结构。并排存在于气缸中。这两种流动结构的相互影响以及为额外的测量平面和各种阀门开口生成这种流动模式的真实数值模拟的能力将分别报告。获得的数据集库将用于验证改进的 CFD 发动机设计规范。对初始实验数据集的分析清楚地表明存在两个涡流，或更可能是向下流动的螺旋流结构。并排存在于气缸中。这两种流动结构的相互影响以及为额外的测量平面和各种阀门开口生成这种流动模式的真实数值模拟的能力将分别报告。获得的数据集库将用于验证改进的 CFD 发动机设计规范。对初始实验数据集的分析清楚地表明存在两个涡流，或更可能是向下流动的螺旋流结构。并排存在于气缸中。这两种流动结构的相互影响以及为额外的测量平面和各种阀门开口生成这种流动模式的真实数值模拟的能力将分别报告。