This liquid injection nozzle atomizes and sprays liquid, while reducing loss of kinetic energy, thereby promoting mixing between the liquid and a gas and thus promoting the reaction between the liquid and the gas. In the liquid injection nozzle, a plurality of distal end tips each having an injection hole are provided on a distal end portion of a nozzle body. Each distal end tip has a conical swirling flow chamber. A communication thin hole is formed in the distal end portion. The communication thin hole extends from a hollow chamber to the conical swirling flow chamber of the distal end tip. When the valve needle is lifted, liquid flows through the communication thin hole into the swirling flow chamber in a tangential direction and generates a vortex flow, and the vortex flow is sprayed from the injection hole.

A spray orifice disk for a valve for a flowing fluid and, in particular, for a metering or injection valve for an internal combustion engine, including a disk body and a spray orifice set-up, which is formed in the disk body and is configured with at least one spray orifice for dispensing supplied fluid, and including at least one channel for supplying the fluid to the spray orifice. The spray orifice, the channel and/or the transition between the channel and the spray orifice being configured to form a swirl geometry of the spray orifice disk in such a manner, that during operation, due to interaction of one or more jets of the fluid emerging from the spray orifice in turbulence atomization, an oval cross-sectional pattern of the spray is formed, in particular, in the form of a flat spray.

Provided is a pre-chamber type diesel engine in which fuel injected from an injector mixes satisfactorily with air in a pre-combustion chamber. An injector injects fuel so as to be dispersed in a direction orthogonal to a vortex flow of air formed inside a pre-combustion chamber.

A front atomization structure of a single-hole atomization fuel injector comprises a tube, an installation sleeve, a valve base, a flow splitter, an overflow member, a rotating flow member, and a metering member. Splitting recesses are arranged at the flow splitter to split a flow into a plurality of streams. An overflow hole is arranged at the overflow member to further limit the stream of the split flow. A rotating flow hole and a rotating flow recess are arranged at the rotating flow member. Upon passing the rotating flow recess, the stream of the split flow impacts a bottom portion of the rotating flow recess blocked by the metering member to form a turbulent stream which converges toward the rotating flow hole. Also provided is a single-hole fuel atomization and injection device.

Provided is a pre-chamber type diesel engine in which fuel injected from an injector mixes satisfactorily with air in a pre-combustion chamber. A corner space section, in which a forced vortex is formed by a flow of air advancing into a pre-combustion chamber from a main combustion chamber via a connecting hole during the compression stroke of a piston, is provided at a prescribed position between the line of extension of the connecting hole and the wall surface of the pre-combustion chamber.

The present invention relates to a nozzle for injecting fuel comprising an orifice in the region of a nozzle tip for leading fuel out of the nozzle and a reception hole for receiving a nozzle needle, wherein the reception hole has a seat region for a sealing closing by a nozzle needle to enable a fuel supply to the orifice in dependence on a position of the nozzle needle, characterized in that the longitudinal axis of the orifice is directed toward a region of the reception hole that adjoins the side of the seat region remote from the nozzle tip.

A diesel engine includes at least one cylinder (1) with a piston (2) having a piston bowl (3). A fuel injector (6) is configured to direct a fuel spray towards a target area (21) on an annular wall section (22) of the piston bowl so as to make a flame (20) formed by ignition of the fuel spray hit the target area. The target area borders, via a flow separation edge (23), on a lowered flow separation area (24) on the annular wall section so as to give this annular wall section a stepped configuration. The flow separation edge and flow separation area are configured to induce the formation of a vortex-filled wake between the flame and the flow separation area on the downstream side of the flow separation edge when the flame flows from the target area, across the flow separation edge and over the flow separation area.

A fuel injection control device for an engine is provided. A swirl generator generates a swirl flow inside a combustion chamber. A fuel injector with multiple nozzle holes injects fuel into the combustion chamber, and forms a lean mixture gas inside the combustion chamber. A spark plug ignites the lean mixture gas to cause a portion of the mixture gas to start combustion accompanied by flame propagation, and then combusts by self-ignition. The fuel injector has first and second nozzle holes, and a first atomized fuel spray injected from the first nozzle hole and a second atomized fuel spray injected from the second nozzle hole separate from each other by the swirl flow. The fuel injector performs the fuel injection in an intake stroke, and retards a start timing of the injection when an engine load is high compared to that when the load is low.

An opposed-piston engine according to an embodiment is a first fuel injection device configured to inject fuel from a circumferential wall surface of at least one cylinder into the cylinder, and a second fuel injection device disposed to be displaced in a circumferential direction so as to be opposite to the first fuel injection device across an axial center of the cylinder. Each of the first fuel injection device and the second fuel injection device includes a plurality of injection holes having different injection directions, in a cross-section orthogonal to the axial direction. A direction directed by a first downstream injection hole is configured to pass through a second injection region, and a direction directed by a second downstream injection hole is configured to pass through a first injection region.

The present invention provides a fuel injector capable of suppressing separation of a fuel flow in an injection port during fuel injection. A fuel injector (30) includes plural injection ports (31a to 31f), each of which injects the fuel into an internal combustion engine (10). The plural injection ports (31a to 31f) are provided in plural on a first circle with a first radius (R1) and on a second circle with a larger second radius (R2) than the first radius (R1), and includes: a first injection port (31a), a center of an opening of which is provided on the first circle; and a second injection port (31c), a center of an opening of which is provided on the second circle on an opposite side of a tangent of the first circle, which passes the center of the opening of the first injection port, from a center axis (CF1) of the fuel injector (30). When seen in a cross section on the shortest line connecting the center of the first injection port (31a) and the center of the second injection port (31c), a first angle (θ1) defined by a center axis (CF2) of the first injection port (31a) and the center axis (CF1) of the fuel injector (30) is larger than a second angle (θ2) defined by a center axis (CF3) of the second injection port (31c) and the center axis (CF1) of the fuel injector (30).