在分析舌形变截面蜗壳工作原理的基础上,提出设计构思。经平台试验可知,舌形挡板可变截面对柴油机性能具有多方面的影响,挡板开度过大增压器效率下降。用自行研制的舌形挡板增压器在WD615.61型柴油机上进行了外特性运行,结果表明;挡板最佳开度为4°～12°;在此开度运行,油耗率下降2％～3％,扭矩和功率均提高2％～3％。 On the basis of analyzing the working principle of volute with tongue deforming section, the design concept is put forward. The platform test shows that the variable cross section of the tongue baffle has many influences on the performance of the diesel engine. The baffle opening is too large and the supercharger efficiency is reduced. With the self-developed tongue-shaped baffle supercharger WD615.61 diesel engine running on the external characteristics, the results show that; baffle best opening of 4 ° ~ 12 °; at this opening run, the fuel consumption rate decreased 2 % ~ 3%, torque and power are increased by 2% to 3%.