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在稳流气道试验台上，使用热线风速仪和自行设计制作的气缸内流场测试系统，对二气门和四气门柴油机模型气缸盖下气缸内流场进行了测量。分析了两种柴油机气缸内流场的形成状况和不同的形成原因。
On the steady flow airway test rig, the flow field inside the cylinder under the cylinder head of the two-valve and four-valve diesel engine models was measured by using the hot wire anemometer and the self-designed in-cylinder flow field test system. The forming conditions of the flow field in the two kinds of diesel engines and their causes were analyzed.