Generalized characteristics of compressors for calculating the joint operation of an internal combustion engine with a turbocharger

Abstract

The effective performance of internal combustion engines largely depends on the correct choice of the boost system and, above all, the turbocharger (TC). When developing a turbocharged engine, one should go through a large number of TC in order to find the option that provides the best engine performance, especially in case of a two-stage boost system. Based on the analysis of the experimental characteristics of three compressors with a wheel diameter in the range of 50...95 mm, generalized characteristics have been obtained that make it possible to select quickly the best TC for any automobile engine and calculate its performance. The main parameters of the compressor are recalculated into dimensionless parameters, which are similar for compressors of different size. Next, the dependences of dimensionless indicators on the main control factors are described by polynomials. The difference between the experimental parameters of the compressors and those calculated by the generalized characteristics in the field of maximum efficiency does not exceed two percent.