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本文系从1984年4月瑞士巴顿BBC公司发表的五篇论文中摘译而成。文中主要介绍最新设计成功的4A系列增压器。4A系列增压器是4系列增压器的进一步发展,其特点是增压器的综合效率η_(TC)高达70％。例如,VTR714A,η_(TC)=72.5％;VTR454A,η_(TC)=71％;VTR304A,η_(TC)=70％。在配机方面,由于许多柴油机大量使用50％的部分负荷工况,因此要求增压器在低负荷时也有广泛的高效区,从而降低油耗。4A系列增压器也可用于使用劣质燃料的柴油机,有利于节约能源;4A系列增压器将于1985年投入市场。——编者
This article is drawn from five articles published by the BBC in Barton, Switzerland in April 1984. The article describes the latest design success 4A series supercharger. The 4A series turbocharger is a further development of the Series 4 supercharger, which features an integrated efficiency η_ (TC) of up to 70% of the turbocharger. For example, VTR714A, η TCT = 72.5%; VTR 454A, η TCT = 71%; VTR 304A, η TCT = 70%. In the allocation of machines, because many diesel engines use 50% of the part load conditions extensively, the supercharger is required to have a wide range of high efficiency areas at low loads, thereby reducing fuel consumption. 4A series supercharger can also be used for diesel engines using inferior fuel, which will help save energy; 4A series turbocharger will be launched in 1985. --editor