Resonant intake tube of natural gas engine

Abstract

The invention provides a resonant intake tube of a natural gas engine, comprising a resonant cavity, an intake collector positioned on the upper part of the resonant cavity and intake manifolds positioned on the lower part of the resonant cavity; wherein, the side wall surface of the resonant cavity, which is connected with the intake collector is shaped like a section of arc surface; the whole resonant cavity is crescent; four intake manifolds go along the center line of the intake collector and are pairwise symmetrical with the planes vertical to the two crescent sides of the resonant cavity; the length of the two intake manifolds in the middle is larger than that of the intake manifolds at both sides; the length of path of the air flowing from the entrance of the intake collector to the exit of each intake manifold is equal. The resonant intake tube not only can fully utilize the resonance effect of the intake air to improve the charging efficiency of the engine but also can improve the unevenness of the intake air of the natural gas engine.

Description

(1) Technical field [0001] The invention relates to the technical field of engines, in particular to a natural gas engine resonant intake pipe structure. (2) Background technology [0002] The increasingly severe energy shortage and environmental pollution have forced automobile manufacturers to actively research engine energy-saving technologies, develop high-efficiency after-treatment devices, and actively explore petroleum alternative energy sources. Natural gas has become the first choice of alternative energy for vehicles due to its advantages of abundant resources and clean combustion. However, natural gas is a gaseous fuel. When the intake port is used to form a mixture, the gaseous fuel will occupy a certain amount of intake charge volume, reducing the amount of air entering the cylinder. Therefore, the power density of a natural gas engine is usually about 10% lower than that of gasoline engines and diesel engines. . In the intake pipe of a four-stroke engine, the...

AI Technical Summary

Problems solved by technology

In the intake pipe of a four-stroke engine, the periodic opening and closing of the intake valve and the reciprocating motion of the piston make the gas in the intake pipe intermittently flow, and at the same time produce strong gas pressure fluctuations. A pressure fluctuation with a certain amplitude will be generated. This pressure wave propagates along the intake pipe at the speed of sound, and reciprocates between the opening end of the intake pipe and the intake valve. If the structure of the intake system can be reasonably designed, the next cycle of intake air will Just before the door closes, there is a positive pressure peak returning to the intake valve, then more gas can be pushed into the cylinder to achieve the effect of supercharging, but due to the different flow losses and pressure fluctuation effects in the intake pipe of each cylinder, the There are differences in the amount of air entering each cylinder, the mixture of air and fuel in each cylinder is different, and the organization of the combustion process is also different, which will cause differences in the combustion process of each cylinder and directly affect the working stability, economy and emission performance of the engine.

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