Calculation method for matching of two-stage supercharging system and diesel engine

Abstract

The invention discloses a matching calculation method of a two-stage highly supercharged system and a diesel engine. The matching calculation method includes the steps that first, according to the given relevant parameters of the diesel engine, the total air mass flow rate and overall pressure ratio required by the diesel engine are calculated; second, the pressure ratio and air volume flow of a low-pressure stage supercharger gas compressor are calculated, and the specification of the low-pressure stage supercharger gas compressor is selected; third, the air volume flow and supercharge ratio of a high-pressure stage supercharger gas compressor are calculated, and the specification of the high-pressure stage supercharger gas compressor is selected; fourth, the expansion ratio and inlet temperature of the turbine end of a high-pressure stage supercharger are calculated, and the turbine specification of the high-pressure stage supercharger is determined; fifth, calculation and model selection are performed on a low-pressure stage turbine; and sixth, a combined operation line of the diesel engine and the superchargers can be estimated according to the specifications of the selected superchargers.

Description

technical field [0001] The invention relates to a matching calculation method of a turbocharger, in particular to a matching calculation method of a two-stage high-charging system and a diesel engine. Background technique [0002] Exhaust gas turbocharger is one of the key components for marine high-power diesel engines to achieve high power density, low fuel consumption and low emissions. With the gradual implementation of IMO Tier III requirements, marine high-power diesel engines are constantly developing towards economy and low emissions. Adopting high pressure ratio and high efficiency supercharging system is an effective way to achieve this goal. The two-stage supercharging is easier to obtain a higher supercharging pressure than the single-stage supercharging, so that the diesel engine can obtain a higher average effective pressure. The higher the boost ratio of the supercharger, the lower the efficiency of the compressor and turbine, so at a given boost pressure, t...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the matching problem between the two-stage supercharging system and the diesel engine, the present invention provides a matching calculation method, through the joint calculation of the parameters associated with the models of the compressor body, exhaust temperature, supercharger, intercooler, etc., to determine the two-stage The distribution of the pressure ratio of the supercharger system completes the selection of the supercharger specification

Images