A low-speed two-stroke gas fuel engine cylinder

Abstract

The invention relates to a cylinder of a low-speed two-stroke gas fuel engine, comprising a cylinder body, a cylinder head, an exhaust passage, an exhaust valve, an air injection valve, a scavenging port and a piston; the cylinder head is arranged on the top of the cylinder body, and the exhaust gas One end of the exhaust valve communicates with the top of the cylinder block, and the other end communicates with the exhaust passage. The circumference of the scavenging port is evenly distributed outside the bottom area of ​​the cylinder block, and the piston is arranged inside the bottom of the cylinder block. , the air injection valve is arranged on the cylinder walls on both sides of the lower part of the cylinder body, and the piston is always located below the air injection valve during the injection duration; the side slip angle γ of the air injection valve ranges from 10-30°, and the The lower deflection angle α of the jet valve ranges from 10-30°. The present invention can optimize the uniformity of the mixed gas in the cylinder under the premise of ensuring that the fuel does not escape from the exhaust valve, so that it can effectively avoid abnormal combustion of the low-speed two-stroke gas fuel engine, thereby obtaining high-efficiency and stable Lean burn.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a low-speed two-stroke gas fuel engine cylinder. Background technique [0002] Low-speed two-stroke gaseous fuel engines using premixed combustion mode can directly meet the requirements of the third-stage emission regulations of the International Maritime Organization (IMO Tier 3), but the engine with this combustion mode will face pre-ignition and knocking under high load conditions and other abnormal combustion problems. The marine low-speed two-stroke gas fuel engine has a large bore, super-long stroke structure and extremely low speed operation characteristics, which makes the tendency and frequency of abnormal combustion higher, and the threat is greater. Because the "abnormal combustion" problem is extremely difficult to solve, it is difficult for a low-speed two-stroke gas fuel engine to achieve efficient and stable combustion. In order to avoid flashback, low-speed two...

AI Technical Summary

Problems solved by technology

After adopting in-cylinder direct injection, the threat of flashback is eliminated, but due to the short mixing time of fuel and air, residual high-temperature hot spots in the cylinder and inhomogeneity of the mixture in the cylinder will still cause "pre-ignition" and "knocking"

Images