The Effect of Fuel Composition and Manifold Conditions Upon Spray Formation from an SI Engine Pintle Injector

Paper #:
  • 941865

Published:
  • 1994-10-01
Citation:
Williams, P. and Beckwith, P., "The Effect of Fuel Composition and Manifold Conditions Upon Spray Formation from an SI Engine Pintle Injector," SAE Technical Paper 941865, 1994, https://doi.org/10.4271/941865.
Pages:
14
Abstract:
The performance of a pintle-type gasoline injector has been studied. Observations performed on test-rigs and running engines suggest that under conditions of low manifold pressure a ‘pencil-jet’ formation may replace the well atomized spray normally produced by the injector. Importantly, this phenomenon was not observed when using substitute fuels such as n-heptane.It is concluded that both the mechanical design of the injector and the combination of the liquid properties density, viscosity and surface tension influence the ability of a given injector to produce a well atomized spray at low manifold pressures. The paper discusses measures to prevent pencil-jet formation.
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