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 language | English |
|---|---|
| Title of host publication | SAE Technical Papers |
| Publisher | SAE International |
| Volume | 2014-November |
| DOIs | |
| Publication status | Published - 2014 Nov 11 |
| Event | SAE/JSAE 2014 20th Annual Small Engine Technology Conference and Exhibition, SETC 2014 - Pisa, Italy Duration: 2014 Nov 18 → 2014 Nov 20 |
Other
| Other | SAE/JSAE 2014 20th Annual Small Engine Technology Conference and Exhibition, SETC 2014 |
|---|---|
| Country | Italy |
| City | Pisa |
| Period | 14/11/18 → 14/11/20 |
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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 proceeding › Conference contribution
}
TY - GEN
T1 - Design guidelines of the single-point auto-ignition engine based on supermulti-jets colliding for high thermal efficiency and low noise
T2 - Obtained by computational experiments for a small strongly-asymmetric double-piston engine
AU - Naitoh, Ken
AU - Okamoto, Takuma
AU - Kubota, Tomoaki
AU - Yamagishi, Kan
AU - Nojima, Yoshiyuki
AU - Tamura, Taro
PY - 2014/11/11
Y1 - 2014/11/11
N2 - 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.
AB - 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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U2 - 10.4271/2014-32-0100
DO - 10.4271/2014-32-0100
M3 - Conference contribution
AN - SCOPUS:84938633721
VL - 2014-November
BT - SAE Technical Papers
PB - SAE International
ER -