Computations and Experiments for Clarifying Compression Level and Stability of Colliding Pulsed Supermulti-Jets in a Piston-Less Single-Point Autoignition Engine

Ken Naitoh*, Jumpei Tsuchiya, Daiki Ikoma, Takuya Nakai, Susumu Oyanagi, Takuto Kanase, Takuma Okamoto, Yoshiaki Tanaka, Ken Ayukawa, Remi Konagaya

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)

Abstract

In recent years, a new type of engine (Fugine) based on the colliding of pulsed supermulti-jets was proposed by us, which indicates the potential for attaining very high thermal efficiencies and also less combustion noise. A prototype engine with eight nozzles for injecting octagonal pulsed supermulti-jets, which was developed with a low-cost gasoline injector and a double piston system, showed high thermal efficiency comparable to that of diesel engines and also less combustion noise comparable to that of traditional spark-ignition gasoline engines. Another type of prototype piston-less engine having fourteen bioctagonal nozzles was also developed and test results confirmed the occurrence of combustion, albeit it was unstable. In this work, time histories of pressure were measured in the combustion chamber of the piston-less prototype engine under a cold flow condition without combustion in order to examine the compression level obtained with the colliding supermulti-jets. Pressure was measured with a piezoelectric sensor. Unsteady three-dimensional computations were also performed and compared with the experimental pressures. The results showed a relatively high pressure level at the cylinder center and low pressure at the walls, which provided evidence of silent autoignition. Moreover, the reason why combustion was unstable in the prototype piston-less engine was also clarified. The data obtained have led to a new technique for improving combustion stability at engine start.

Original languageEnglish
JournalSAE Technical Papers
Volume2016-Octobeer
DOIs
Publication statusPublished - 2016
EventSAE International Powertrains, Fuels and Lubricants Meeting, FFL 2016 - Baltimore, United States
Duration: 2016 Oct 242016 Oct 26

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

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