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Computations and Experiments for Clarifying Compression Level and Stability of Colliding Pulsed Supermulti-Jets in a Piston-Less Single-Point Autoignition Engine
Technical Paper
2016-01-2331
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
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.
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Authors
- Ken Naitoh - Waseda University
- Jumpei Tsuchiya - Waseda University
- Daiki Ikoma - Waseda University
- Takuya Nakai - Waseda University
- Susumu Oyanagi - Waseda University
- Takuto Kanase - Waseda University
- Takuma Okamoto - Waseda University
- Yoshiaki Tanaka - Waseda University
- Ken Ayukawa - Waseda University
- Remi Konagaya - Waseda University
Topic
Citation
Naitoh, K., Tsuchiya, J., Ikoma, D., Nakai, T. et al., "Computations and Experiments for Clarifying Compression Level and Stability of Colliding Pulsed Supermulti-Jets in a Piston-Less Single-Point Autoignition Engine," SAE Technical Paper 2016-01-2331, 2016, https://doi.org/10.4271/2016-01-2331.Also In
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