This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Computations and Experiments for Clarifying Compression Level and Stability of Colliding Pulsed Supermulti-Jets in a Piston-Less Single-Point Autoignition Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 17, 2016 by SAE International in United States
Annotation ability available
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.
- 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
CitationNaitoh, 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.
- Kerrebrock, JL., “Aircraft Engines and Gas Turbines.MIT Press”, Cambridge, MA: (1992): 1-494.
- Takagi, Y., Itoh, T., Muranaka, S., Iiyama, A. et al., "Simultaneous Attainment of Low Fuel Consumption High Output Power and Low Exhaust Emissions in Direct Injection SI Engines," SAE Technical Paper 980149, 1998, doi:10.4271/980149.
- Kailasanath, K., Review of Propulsion Applications of Detonation Waves, AIAA Journal Vol. 39, No. 9 (2000): 1698-1708.
- Jackson, TA., Power for a Space Plane. Scientific American. 295(2) (2006): 56-63.
- Nakajima, Y., Muranaka, S., Automobile Gasoline Engines, Tokyo: Sankaido, 1999.
- Naitoh, K., Engine. submitted as patents. (2010, 2011). Also submitted in an English version for examination (2012).
- Naitoh K., “A New Cascade-Less Engine Operated from Subsonic to Hypersonic Conditions.” J. of Thermal Science, 2010, 19-6: 481-485.
- Naitoh, K., Shinimu D., Nonaka S., Kainuma, Y., and Emoto, T., “The fifth compression strategy for hypersonic aircar.” AIAA paper 2012-3314, 2012.
- Naitoh, K., Shimizu, D., Nonaka, S., “Stability limit of supermulti-jets convergence engine operated from startup to extremely-hypersonic conditions: revealed by shock-tube experiments.” AIAA paper 2012-5923, 2012.
- Naitoh, K., Tanaka, S., Emoto, T., Kainuma, Y. et al. “Supermulti-jets colliding for the ultimate engine.” Proceedings of COMODIA, Hakata, 2012.
- Naitoh, K., Nakamura, K., Emoto, T., and Shimada, T., “A Wide-range Single Engine: operated from startup to hypersonic.” AIAA paper 2011-2316, 2011.
- Naitoh, K., Emoto, T., Nakamura, K., and Kainuma, Y., "An Ultimate Engine: designed by Computational Fluid Dynamics," SAE Technical Paper 2011-01-2027, 2011, doi:10.4271/2011-01-2027.
- Naitoh K., Marui, M., Ishida, K., Sagara, Y. et al. “Simultaneous attainment of light-weight, high efficiency, and low noise: by supermultijets-twister engine working from startup to hypersonic scram mode.” AIAA paper 2013-3011. 2013.
- Hashimoto, T., Naitoh, K., Tanakna, M., Nojima, Y. et al. “Strongly-asymmetric Double Piston Engine: Assisted by Super Multi-jets Colliding.” JSAE paper 81-20135740. (2013).
- Tamura, T., Naitoh K., Nonaka, S., Sagara, K. et al. “Fundamental Combustion Test Based on Supermulti-jets Colliding.” 24th Nainen-kikan Symposium, Kobe (2013).
- Tanaka, M., Naitoh, K., Nojima, Y., Kubota, T. et al. “Strongly-symmetric Double Piston Engine: Assisted by Super Multi-jets Colliding.” 24th Nainen-kikan Symposium, Kobe (2013).
- Naitoh, K., Ishida, K., Nonaka, S., Kubota, T. et al. “Fugine: the supermultijet-convergence engine working from startup to hypersonic scram mode and attaining simultaneously light-weight, high-efficiency, and low noise.” AIAA paper 2014-3960, 2014.
- Naitoh, K., Okamoto, T., Kubota, T., Yamagishi, K. et al., "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," SAE Technical Paper 2014-32-0100, 2014, doi:10.4271/2014-32-0100.
- Naitoh, K., Yamagishi, K., Nonaka, S., Okamoto, T. et al., "Unsteady Three-Dimensional Computational Experiments of the Single-Point Auto-Ignition Engine Based on Semispherical Supermulti-Jets Colliding with Pulse for Automobiles," SAE Technical Paper 2014-01-2641, 2014, doi:10.4271/2014-01-2641.
- Naitoh, K., Kojima, K., Okamoto, T., Yamagishi, K. et al., "Physical Theory of the Single-Point Auto-Ignition Engine Based on Supermulti-Jets Colliding with Pulse: Leading to Thermal Efficiency over 60% at Various Engine Speeds and Loads of Automobiles," SAE Technical Paper 2014-01-2640, 2014, doi:10.4271/2014-01-2640.
- Naitoh, K., Tanaka, Y., Tamura, T., Okamoto, T. et al. “Fugine cycle theory: predicting high efficiency of the supermultijet-convergence engine working from startup to hypersonic scram mode.” AIAA paper 2015-2968. 2015.
- Naitoh, K., Hasegawa, K., Kubota, T., Hashimoto, T. et al., "Development Of Fugine Based on Supermulti-Jets Colliding with Pulse: Leading to Stable Plug-Less Start and Improvement of HCCI with Satisfactory Strength of Structure," SAE Technical Paper 2014-01-2639, 2014, doi:10.4271/2014-01-2639.
- Naitoh, K., Ikoma, D., Sagara, H., Tamura, T. et al., "Two Small Prototype Engines Developed based on Pulsed Supermulti-Jets Colliding: Having a Potential of Thermal Efficiency Over 60% with Satisfactory Strength of Structure," SAE Technical Paper 2014-32-0099, 2014, doi:10.4271/2014-32-0099.
- Naitoh, K., Shirai, T., Tanaka, M., Nojima, Y. et al., "Fugine as Single-Point Compression Engine based on Supermulti-Jets Colliding with Pulse: Combustion Test of Second Prototype Engine with Strongly-Asymmetric Double-Piston System," SAE Technical Paper 2015-01-1964, 2015, doi:10.4271/2015-01-1964.
- Landau, ED and Lifshitz, EM. Fluid Mechanics. 2nd Edition, Oxford: Butterworth-Heinemann Elsevier, 2004.
- Shinmura, N., Kubota, T., Naitoh, K., “Cycle-resolved computations of stratified-charge turbulent combustion in direct injection engine.” JSME International Journal of Thermal Science and Engineering, 2013, Vol. 8, No. 3.
- Naitoh, K. and Shimiya, H., “Stochastic determinism capturing the transition point from laminar flow to turbulence”. Japan Journal of Industrial and Applied Mathematics, 2011.
- Kato, A., Misawa, S., Yoshimatsu, A. Nakamura, M. et al., “A Study of Rising Thermal Efficiency Using an Argon Circulated Hydrogen Engine (Third Report).” JSAE paper 20135721, 2013.
- Kailasanath, K., “Review of Propulsion Applications of Detonation Waves.” AIAA Journal, 2000, Vol. 39, No. 9, 1698-1708.
- Naitoh, K, Kojima, K., Hasegawa, K., Shirai, T. et al. “An ultimate engine: based on supermulti-jets colliding with pulsation (Fourth Report)”, to be published as JSAE paper, 2016.
- Kihara, T., Yamagishi, K., Naitoh, K., “Three-dimensional computations of fuel spray and mixing process in the engine assisted by supermulti-jets colliding.” Proceedings of 26th Internal Combustion Engine Symposium. 2015.
- HONDA, "activated radical combustion system." Available from http://www.honda.co.jp/news/1996/296102.html
- Yoshizawa, K., Teraji, A., Aochi, E., Kubo, M. et al., "Numerical Analysis of Combustion in Gasoline Compression Ignition Engines," SAE Technical Paper 2002-01-2865, 2002, doi:10.4271/2002-01-2865.
- Nakajima, Y., Muranaka, S., “Automobile Gasoline Engines,” Tokyo: Sankaido, 1999 (in Japanese).
- Naitoh K., Ohara S., Onuma Y., Shirai, T. et al. "COMBUSTION EXPERIMENT OF SILENT SINGLE-POINT AUTO-IGNITION ENGINE: FUGINE." FISITA. F2016-ESYB-002, 2016.
- Naitoh, K., Ayukawa, K., Ikoma, D., Nakai, T. et al., "Fundamental combustion experiments of a piston-less single-point autoignition gasoline engine based on compression due to colliding of pulsed supermulti-jets," SAE Technical Paper 2016-01-2337, 2016, doi:10.4271/2016-01-2337.
- Naitoh, K., Ohara, S., Onuma, Y., Kojima, K. et al., "High thermal efficiency obtained with a single-point autoignition gasoline engine prototype having pulsed supermulti-jets colliding in an asymmetric double piston unit," SAE Technical Paper 2016-01-2336, 2016, doi:10.4271/2016-01-2336.
- Yamagishi, K., Onuma, Y., Ohara, S., Hasegawa, K. et al., "Computations and experiments of single-point autoignition gasoline engine with colliding pulsed supermulti-jets, single piston and rotary valve," SAE Technical Paper 2016-01-2334, 2016, doi:10.4271/2016-01-2334.