Method for dispersing hydrogen internal combustion engine hydrogen jet flow and mixing gas

Abstract

The invention discloses a method for dispersing hydrogen internal combustion engine hydrogen jet flow and mixing gas. The method includes the first step of determining a mixed gas uniformity evaluation index, and evaluating mixed uniformity of mixed gas in a cylinder by using an nonuniform coefficient nindex of the mixed gas in the cylinder, the second step of building CFD simulation models of an air inlet duct and an air cylinder, and determining the shapes and positions of turbulent flow blocks based on the CFD simulation models, and the third step of installing the turbulent flow blocks, manufacturing the turbulent flow blocks according to the shapes and positions of the turbulent flow blocks in three-dimensional simulation models, and enabling the turbulent flow blocks to be installed in an internal combustion engine. Through reasonable arrangement of the turbulent flow blocks in the air ducts, the method can disperse hydrogen jet flow, increases air inflow vortex, improving mixing speed in hydrogen air, increases mixing uniformity of the hydrogen air, improves dispersing effect of the hydrogen, and achieving uniform mixing of the mixed gas.

Description

technical field [0001] The invention mainly relates to a method for mixing gas of an internal combustion engine, in particular to a method for dispersing and mixing gas by a hydrogen jet flow of a hydrogen internal combustion engine. Background technique [0002] The adiabatic combustion temperature of hydrogen is very high, and the cylinder temperature of hydrogen-fueled internal combustion engines is higher than that of traditional internal combustion engines, and it is easier to produce more NO than traditional internal combustion engines under heavy load conditions X emission. Studies have shown that hydrogen internal combustion engines NO X Emissions increase sharply with the equivalent fuel-air ratio, showing a strong nonlinear relationship. Therefore, in order to meet the emission requirements, hydrogen internal combustion engines often use a lower equivalent fuel-to-air ratio and work under lean combustion conditions, which is also an important factor for the low p...

AI Technical Summary

Problems solved by technology

However, premature injection is likely to cause the loss of hydrogen fuel. Due to the limitation of valve timing, the advance amount of hydrogen injection is limited.

Second, increase the injection pressure, increase the diffusion speed, and improve the mixing uniformity, but too high injection pressure increases the residual amount of hydrogen in the cylinder and reduces the fuel utilization rate, so the injection pressure cannot be too high

Images