双进气道柴油机可调涡流进气道匹配规律

研究双进气道柴油机进气道的涡流比和流量系数对进气涡流调节规律的影响.在稳流气道实验台上,对两种典型的双进气道柴油机的切向气道、螺旋气道的进气流动特性和进气涡流调节特性进行试验,采用横挡板遮挡切向气道入口方式调节进气涡流.试验结果表明,在一定范围内,涡流比和流量系数之间存在线性折中关系.通过数学公式的推导和分析可知:在对柴油机的两个进气道进行匹配时,如果要拥有良好的进气涡流可调性,被调进气道流量系数应取较大值,涡流比应取较小值,不调节进气道的涡流比应取较大值.

Matching of Variable Swirl Intake Port in Double-Intake Port Diesel Engine

The effect of swirl ratio and coefficient of intake flow of each intake port on the rule of regulation of intake swirl is studied for a double-intake-port diesel engine.With the steady flow rig,many tests were accomplished to acquire the performance of intake flow and the adjusted performance of intake swirl of a tangential port and a helical port for two kinds of double-intake-port diesel engines.The method of blocking the inlet of a tangential port was used to adjust the intake swirl.Experimental results indicated that there is a linear compromise between the flow coefficient and swirl ratio of a tangential port in a definite range.By deduction and analysis,it is concluded that when two intake ports are matched in a diesel engine,in order to obtain a well regulated performance of the intake swirl,the flow coefficient of the adjusted port should be as high as possible,the swirl ratio of the adjusted port should be as low as possible,and the swirl ratio of the non-adjusted port should be as high as possible.