Two Prototype Engines with Colliding and Compression of Pulsed Supermulti-Jets through a Focusing Process, Leading to Nearly Complete Air Insulation and Relatively Silent High Compression for Automobiles, Motorcycles, Aircrafts, and Rockets

Konagaya, Remi; Naitoh, Ken; Kobayashi, T.; Isshiki, Yuuki; Ito, Hajime; Makimoto, Hiroki; Kobayashi, Yoshiki; Tada, Yasuhiro; Kikuchi, Nozomu; Hosoi, Aya; Fujii, Yukio

doi:10.4271/2020-01-0837

SAE Technical Paper Series 2020

DOI: 10.4271/2020-01-0837

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Two Prototype Engines with Colliding and Compression of Pulsed Supermulti-Jets through a Focusing Process, Leading to Nearly Complete Air Insulation and Relatively Silent High Compression for Automobiles, Motorcycles, Aircrafts, and Rockets

Remi Konagaya

Ken Naitoh²,

T. Kobayashi

et al.

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2023

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Cited by 2 publications

References 29 publications

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Combustion Experiments of Focusing Engine with Asymmetric Double-Piston System Leading to Relatively-Silent High Compression Ratios

Naitoh¹,

Kobayashi²,

Saba³

et al. 2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">In our previous reports, we proposed a new focusing engine with high thermal efficiency based on relatively-silent high compression and nearly-complete air-insulation effect, which employs pulsed multi-jets of gas collided around chamber center. Local compression level due to the gas jets colliding around chamber center before reaction can be varied from zero to 100MPa and 3000K, by changing the number of jets and intake pressure. Relatively-silent high compression is possible, because region around chamber wall is at pressure level of traditional engines. This is suitable for various usages of automobiles, aerocrafts, and rockets, and also for various fuels including hydrogen, because high compression around chamber center leads to stable auto-ignition and potential of low NOx at very lean burning operation.</div><div class="htmlview paragraph">We developed two types of focusing compression engines, without and with piston. For the new engine without piston, we obtained nearly-complete air-insulation and high thrust. In this report, we show very less occurrence of knocking of gasoline in the engine having strongly-asymmetric double piston system, which leads to potential of braking thermal efficiency over 50% even for small engines.</div></div>

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Combustion Experiments of Focusing Engine with Asymmetric Double-Piston System Leading to Relatively-Silent High Compression Ratios

Naitoh¹,

Kobayashi²,

Saba³

et al. 2023

SAE Technical Paper Series

View full text Add to dashboard Cite

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Experimental and Computational Study of Auto-ignition in the New Prototype Engine with Focusing Compression due to Supermulti-Jets Colliding

Kobayashi¹,

Naitoh²,

Migita³

et al. 2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">We have proposed a new compressive combustion principle leading to the auto-ignition of fuel by focusing compression due to the collision of the pulsed supermulti-jets. This principle has the potential of nearly-complete air insulation due to encasing burned gas around the center of the combustion chamber and a high compression ratio around the chamber center while suppressing vibration and noise levels. We have developed the first prototype engine having a very small combustion chamber of a diameter of 18 mm and also 14 side passages for the supermulti-jets colliding at the chamber center. Combustion experimental results indicating air insulation effect and high thrust over 100 N were obtained as basic data for various types of applications, including automobiles and aerospace usage such as for rockets. However, it was found that higher compression due to more jets is necessary to get stabler combustion. Therefore, by using a metal 3D printer, we have developed the second engine with 24 side passages of gas jets colliding, while performing direct injection of liquid fuel at injection pressure over 5 MPa into the combustion chamber. In our previous report, the experiment without combustion and its computational simulation show that the second engine enables a higher compression ratio than that of the first prototype engine. In this research, we conduct fundamental combustion experiments using the second engine with a direct injection system, purposing to achieve stable multi-cycle combustion with auto-ignition of the fuel by focusing compression due to the collision of supermulti-jets. As a result, a stabler occurrence of combustion is confirmed for the second engine. Experimental data of wall pressure obtained also indicate that auto-ignition occurs due to collision of the supermulti-jets while showing a possibility of higher thrust over 300 N. Furthermore, we qualitatively perform computations of reacting flows for the second engine, while showing liquid fuel spray atomized strongly by the gas jets.</div></div>

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Two Prototype Engines with Colliding and Compression of Pulsed Supermulti-Jets through a Focusing Process, Leading to Nearly Complete Air Insulation and Relatively Silent High Compression for Automobiles, Motorcycles, Aircrafts, and Rockets

Cited by 2 publications

References 29 publications

Combustion Experiments of Focusing Engine with Asymmetric Double-Piston System Leading to Relatively-Silent High Compression Ratios

Combustion Experiments of Focusing Engine with Asymmetric Double-Piston System Leading to Relatively-Silent High Compression Ratios

Experimental and Computational Study of Auto-ignition in the New Prototype Engine with Focusing Compression due to Supermulti-Jets Colliding

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