Design guidelines of the single-point auto-ignition engine based on supermulti-jets colliding for high thermal efficiency and low noise: Obtained by computational experiments for a small strongly-asymmetric double-piston engine

Ken Naitoh, Takuma Okamoto, Tomoaki Kubota, Kan Yamagishi, Yoshiyuki Nojima, Taro Tamura

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    10 Citations (Scopus)

    Abstract

    An inexpensive, lightweight, and relatively quiet engine reactor that has the potential to achieve thermal efficiency over 50% for small engines was proposed in our previous reports, which is achieved with colliding supermulti-jets that create air insulation to encase burned gas around the chamber center, avoiding contact with the chamber walls and piston surfaces. The colliding of pulse jets can maintain high pressure ratio for various air-fuel ratios, whereas traditional homogeneous compression engines due to piston cannot get high pressure ratio at stoichiometric condition. Emphasis is also placed on the fact that higher compression in this engine results in less combustion noise because of encasing effect. Here, a small prototype engine having supermulti-jets colliding with pulse and strongly-asymmetric double-piston system is examined by using computational experiments. Pulse can be generated by the double piston system of a short stroke of about 40mm. Computations at some loads and engine speeds show a potential of high thermal efficiency over 60%, because there is very less heat loss on combustion chamber and piston surface. Design guidelines on the number of jets colliding and the size ratio of bore size and jet diameter are also shown in this report.

    Original languageEnglish
    Title of host publicationSAE Technical Papers
    PublisherSAE International
    Volume2014-November
    DOIs
    Publication statusPublished - 2014 Nov 11
    EventSAE/JSAE 2014 20th Annual Small Engine Technology Conference and Exhibition, SETC 2014 - Pisa, Italy
    Duration: 2014 Nov 182014 Nov 20

    Other

    OtherSAE/JSAE 2014 20th Annual Small Engine Technology Conference and Exhibition, SETC 2014
    CountryItaly
    CityPisa
    Period14/11/1814/11/20

    Fingerprint

    Engine pistons
    Ignition
    Pistons
    Engines
    Experiments
    Combustion chambers
    Air
    Heat losses
    Acoustic noise
    Contacts (fluid mechanics)
    Hot Temperature
    Insulation
    Compaction
    Gases

    ASJC Scopus subject areas

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

    Cite this

    Design guidelines of the single-point auto-ignition engine based on supermulti-jets colliding for high thermal efficiency and low noise : Obtained by computational experiments for a small strongly-asymmetric double-piston engine. / Naitoh, Ken; Okamoto, Takuma; Kubota, Tomoaki; Yamagishi, Kan; Nojima, Yoshiyuki; Tamura, Taro.

    SAE Technical Papers. Vol. 2014-November SAE International, 2014.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Naitoh, K, Okamoto, T, Kubota, T, Yamagishi, K, Nojima, Y & Tamura, T 2014, Design guidelines of the single-point auto-ignition engine based on supermulti-jets colliding for high thermal efficiency and low noise: Obtained by computational experiments for a small strongly-asymmetric double-piston engine. in SAE Technical Papers. vol. 2014-November, SAE International, SAE/JSAE 2014 20th Annual Small Engine Technology Conference and Exhibition, SETC 2014, Pisa, Italy, 14/11/18. https://doi.org/10.4271/2014-32-0100
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    abstract = "An inexpensive, lightweight, and relatively quiet engine reactor that has the potential to achieve thermal efficiency over 50{\%} for small engines was proposed in our previous reports, which is achieved with colliding supermulti-jets that create air insulation to encase burned gas around the chamber center, avoiding contact with the chamber walls and piston surfaces. The colliding of pulse jets can maintain high pressure ratio for various air-fuel ratios, whereas traditional homogeneous compression engines due to piston cannot get high pressure ratio at stoichiometric condition. Emphasis is also placed on the fact that higher compression in this engine results in less combustion noise because of encasing effect. Here, a small prototype engine having supermulti-jets colliding with pulse and strongly-asymmetric double-piston system is examined by using computational experiments. Pulse can be generated by the double piston system of a short stroke of about 40mm. Computations at some loads and engine speeds show a potential of high thermal efficiency over 60{\%}, because there is very less heat loss on combustion chamber and piston surface. Design guidelines on the number of jets colliding and the size ratio of bore size and jet diameter are also shown in this report.",
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