COMBUSTION SYSTEM, GAS ENGINE, AND COMBUSTION SYSTEM DESIGN METHOD

A combustion system includes a piston (3), a cylinder head (4), a natural gas injector (2), and a fuel injector (1), where a combustion chamber (5) is formed between the piston (3) and the cylinder head (4), an air intake passage (41) is disposed on the cylinder head (4), the air intake passage (41) is configured to cause the airflow in the combustion chamber (5) to flow in a swirling manner along a circumferential direction of the combustion chamber (5), the natural gas injector (2) and the piston (3) are coaxially arranged, and multiple natural gas injection holes (21) are arranged at intervals on the natural gas injector (2) along a circumferential direction; a point of intersection between the central axis of the fuel injector (1) and a first preset plane (100) is a first intersection point, a point of intersection between the central axis of the natural gas injector (2) and the first preset plane (100) is a second intersection point, the first preset plane (100) is perpendicular to the central axis of the piston (3), and a line connecting the first intersection point and the second intersection point is a reference line (300); a first fuel injection hole (11) and a second fuel injection hole (12) are disposed on the fuel injector (1), the first fuel injection hole (11) and the second fuel injection hole (12) are located on two sides of the reference line (300), an included angle between the central axis of the first fuel injection hole (11) and the reference line (300) is α, and an included angle between the central axis of the second fuel injection hole (12) and the reference line (300) is β, where α > β; and a plane perpendicular to the reference line (300) and containing the central axis of the fuel injector (1) is a second preset plane (200), the first fuel injection hole (11) is located on a side of the second preset plane (200) facing the natural gas injector (2), and an included angle between a fuel jet injection direction of the second fuel injection hole (12) and a tangential direction of the airflow flowing through the fuel injector (1) in the swirling manner is an acute angle. The fuel jet injected by the second fuel injection hole ignites some natural gas jets on the same side as the second fuel injection hole. Under the action of the swirl in the combustion chamber, as the second fuel injection hole continues injecting the fuel jet, the flame formed by ignition of the natural gas jets by the fuel jet gradually extends along a swirling direction so that the fuel jet injected by the second fuel injection hole can ignite the natural gas jets on a side of the natural gas injector facing away from the fuel injector. Further provided are a gas engine and a combustion system design method.