High precision knocking prediction method reproducing DNS
Although the knocking phenomenon is a hindrance to the improvement of the thermal efficiency of the engine, the detailed mechanism of the occurrence of knocking has been difficult to fully understand due to the complex interaction of hydrodynamics and chemical reactions. The inventors performed DNS (Direct Numerical Simulation) to calculate the basic equations of a reactive fluid, and confirmed the agreement with experimental data of knocking for the first time in the world [1]. Further, by analyzing the mechanism of the occurrence of knocking in detail, it was found that there was a "critical condition" in which a flame, which is a combustion chemical reaction wave, could not exist as a flame and had to transition to severe overall ignition under extreme conditions. From this, an equivalent theory of ignition and flame was constructed, and the conditions for the occurrence of knocking were successfully derived [2]. The present invention makes it possible to predict the occurrence of knocking accurately and relatively simply, which has been impossible until now.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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