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提高效率和能力始终是用于柴油机的大型涡轮增压器所追求的目标。涡轮增压器的高效率可以降低发动机的热负荷和提高热效率。同样地,涡轮增压器能力的增大可以使涡轮增压器的尺寸达到最小化,而这对于降低发动机的成本和节省空间是有利的。另一方面,涡轮增压器的设计者有时又不情愿改变设计,因为新的设计很可能就是产生技术问题的原因,而传统设计的可靠性已经被许多运用经验所证明。然而,三菱重工业有限公司还是作出决定,对其MET型涡轮增压器进行必要的设计修改,即改变涡轮叶片、涡轮进气壳与出气壳以提高涡轮增压器效率和涡轮能力。对已被理想的运用经验所证明的目前的设计的机械强度进行了核实并与新设计进行了对比。上述新部件的计算分析和试验结果表明,它们的性能要比目前的设计高得多。另外,为了降低进气消声器处的噪声水平和压力降,根据分析结果亦对消声器的设计进行了修改。新设计的优点已由涡轮增压器台架试验所证实。尽管上述设计修改不是很大,但对于改进性能却是有效的,并且对设计相容性或者对已得到证明的涡轮增压器的可靠性只有最小程度的影响。整篇文章勾划出下一代三菱涡轮增压器的概貌。
Improving efficiency and capacity has always been the goal pursued by large turbochargers for diesel engines. The high efficiency of the turbocharger can reduce the thermal load on the engine and increase the thermal efficiency. Likewise, an increase in turbocharger capacity can minimize the size of the turbocharger, which is advantageous for reducing engine costs and saving space. Turbocharger designers, on the other hand, are sometimes reluctant to change their designs because the new design is probably the cause of the technical problem, and the reliability of the traditional design has been demonstrated by many operational experience. However, Mitsubishi Heavy Industries Ltd. has also made a decision to make the necessary design changes to its MET turbocharger, namely changing turbine blades, turbine inlet and outlet housings to improve turbocharger efficiency and turbine capacity. The mechanical strength of the current design, which has been demonstrated by the ideal application experience, has been verified and compared with the new design. The computational analysis and experimental results of the above new components show that they perform much better than the current design. In addition, to reduce the noise level and pressure drop at the intake silencer, the design of the silencer was also modified based on the analysis results. The advantages of the new design have been confirmed by the turbocharger bench test. Although the above design modifications are not significant, they are effective in improving performance and have minimal impact on design compatibility or on the reliability of a proven turbocharger. The whole article outlines the next generation of Mitsubishi turbocharger profile.