作 者：
刘欣;熊淦;胡春明;董亮亮;张巍;乔治彬
关键词：
四冲程汽油机;进气道;斜轴涡流;双特征角;线性回归分析
摘 要：
利用双特征角气道稳流试验台,对一款二气门四冲程单缸试验机的3种不同进气道方案进行了不同测试平面的气流运动试验和分析.结果表明,提高原气道涡流强度来改善燃烧的同时会降低气道的流通能力,但适度提高滚流强度的同时还可以提高流通能力.利用测得的无因次涡流比和滚流比,提出了一个简便的斜轴涡流特征参数计算公式,并通过试验数据给予了有效性证明.另外对特征角α=60°时的无因次涡流比和利用涡流与滚流合成的无因次斜轴涡流比进行了线性回归分析,3种方案数据的相关系数分别是0.96、0.97、0.97,因此,通过稳流气道试验台测取某一特征角度下的无因次涡流比可以评价进气道斜轴涡流的性能.
单 位：
Tianjin Internal Combustion Engine Research Institute,Tianjin University,Tianjin 300072,China
关键词：
Four stroke gasoline engine Intake port Inclined swirl Double eigen angle Linear regression analysis
摘 要：
A double eigen angle steady-state flow rig was used to measure three modified options of intake port on a single cylinder four stroke gasoline engine.The results showed that improving combustion by enhancing swirl might reduce the flow capacity while improving tumble ratio appropriately could also increase the intake flow coefficient.Based on the dimensionless swirl ratio and tumble ratio,a group of simple formulas which were used to calculate the inclined swirl characteristic parameters were proposed,and related experiments were accomplished to prove their effectiveness.Additionally,linear regression analysis was conducted between the dimensionless swirl ratio at the condition characteristic angle α of 60° and the dimensionless inclined swirl ratio synthesized by swirl ratio and tumble ratio,and the correlation coefficient of three options were 0.96,0.97 and 0.97 respectively.It was concluded that the performance of intake port could be evaluated by the dimensionless swirl ratio at a certain angle α instead of swirl ratio and tumble ratio.
