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汽油机气道设计不仅要保证低的流动阻力而且还要有好的汽化燃料的性能。本文从理论上分析表明伐隙处是影响流动阻力的主要部位而促进燃料汽化的合理之处应在气道靠近进气歧管的入口处,在气道喉口部加入一文氏园环可改善气流通过伐隙处的流型使流量提高,而局部修改气道入口处的形状能在需要的地方产生强烈的扰动使燃料汽化。按上述原则改进设计CA—10B发动机的气道在稳流试验台上进行试验,其平均流量提高约10％,用丝从法观测到在气道入口处易产生油膜的底部产生强烈的扰动。
Gasoline engine air passage design must not only ensure low flow resistance but also good vaporized fuel performance. In this paper, the theoretical analysis shows that the cutting gap is the main part of the flow resistance and promote the fuel vaporization should be reasonable in the air intake near the intake manifold entrance, the throat of the airway to join a venturi ring can be improved Airflow through the cut-off flow pattern increases the flow rate, while locally modifying the shape of the airway inlet creates a strong perturbation where necessary to vaporize the fuel. According to the above principles to improve the design of the CA-10B engine airway on the steady flow test bench, the average flow rate increased by about 10%, the wire observed from the law at the air inlet easy to produce the bottom of the film produced a strong disturbance.