Electroformed Multilayer Orifice Plate for Improved Fuel Injection Characteristics

Jörg Heyse; Frank Schatz; Beate Ader; Jörg Schlerfer; Sven Haubold

doi:10.4271/971070

1997-02-24

Electroformed Multilayer Orifice Plate for Improved Fuel Injection Characteristics 971070

A new orifice plate (OP) for advanced fuel injection characteristics is presented. The OP is designed to optimize the air-fuel mixture generation and transportation within individually shaped manifold geometries of spark-ignition engines. To generate the suitable spray characteristics, the basic OP design and its flow characteristics have some features originating from the well known turbulence nozzle principle:

Turbulence generating flow deflections within the OP are achieved by superimposing layers containing flow cavities, which are displaced from one another. The flow deflections effect atomization and define the spatial spray beam orientation.

A great variety and a high volume of precisely structured, low cost OPs can be produced daily by micromachining the layers in electroformed nickel. The flow cavities and outer dimensions of each layer are shaped by photo-resist structures.

This paper describes the new OP's design development achieved through engine tests, flow simulations and experimental spray tests. A suitable OP manufacturing method is illustrated. For a wide range of flow rates, the new OP produces multiform spray shapes containing finely atomized, homogeneously distributed droplets. These characteristics are suitable for improving spray propagation and air-fuel mixture preparation.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Digital $37.00 Print $37.00

Preview Document

We also recommend:

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

Electroformed Multilayer Orifice Plate for Improved Fuel Injection Characteristics 971070

SAE MOBILUS