Experimental modeling of large scale gas fuel injector for IC piston engines

• Autorzy: Bocian P. , Wojciechowski J. , Rychter T.
• Konferencja: Proceedings of the Third Seminar on Recent Research and Design Progress in Aeronautical Engineering and its Influence on Education/seminar(III; 23-25.11.1998; Warszawa, Polska)
• Języki publikacji: EN

Abstrakty

EN

Supplying 1C piston engines with gaseous fuels is one of well known approaches to reduce the content of polluting components in exhaust gases. One of methods for gaseous fuel supply considered is a high-pressure direct gas injection, which is currently studied in a number of laboratories. The successful application of this method requires the proper organisation of the combustion system and particularly - the careful treatment of the gas injection process and its mixing with the surrounding air. Very important is also the location of the choice of the ignition point in order to assure repeatable combustion initiation. The mixing process strongly depends on the shape and the direction of the injected gas which, in turn, depends on the injector tip geometry. The main objective of the presented experimental analysis is to determine the best of the gaseous fuel single-nozzle injector, would be able to assure the proper mixing of the gas with air. The investigations were performed under "cold" conditions with the use of the model gas injector in geometrical scale 10:1. The conventional-like form of the nozzle was with annular gas flow area created by the gap between the pintle and the nozzle wall. The element as well as experimental conditions be easily changed in the wide range This made it possible to select jet geometry (the form, length and convergence angle of the pintle, nozzle outlet and divergence angle etc.). It also for the longitudinal vorticity control: from axial flow to the flow with strong velocity component, or any form. The injection gas pressure was 0.5 MPa, which allowed for the rough simulation engine conditions, for a large spectrum of flow geometries (pintle, nozzle, vorticity). The CO2 was as a working medium. There were used: flow visualisation by schlieren method, the hot-wire technique for determination of velocity especially designed hot-wire probe and the infrared energy apparatus to measure - respectively - the high and low or very low injected gas local concentration. Some interesting injector configurations were chosen for posterior measurements of velocity field in the free circular jet of gas past the injector. The study allowed for drawing the optimal schema of the single-nozzle gas fuel injector, which has become the base for the combustion tests in a normal-scale injection system.

Słowa kluczowe

EN

experimental modelling; fuel injector; gas; piston engines

PL

modelowanie eksperymentalne; wtryskiwacz paliwa; benzyna; silniki tłokowe

• Wydawca: Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology
• Czasopismo: Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics
• Rocznik: 1998
• Tom: nr 8
• Strony: 81--84
• Opis fizyczny: Bibliogr. 4 poz., rys., tab., wykr.

Twórcy

autor

Bocian P.

autor

Wojciechowski J.

autor

Rychter T.

• Warsaw University of Technology, Warsaw, Poland