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

We have proposed a new compressive combustion principle based on pulsed supermulti-jets colliding through focusing process, by injection from chamber wall to chamber center. This principle has potential of relatively-silent high compression around chamber center because of auto-ignition far from chamber wall and nearly-complete air insulation due to encasing of burned high temperature gas. The present principle leading to higher thermal efficiency and higher power will be applicable for automobiles, aircrafts, rockets, and also flying cars to be realized in the future. Then, water cooling system made smaller or even eliminated will result in lower price, while auto-ignition in an area larger than that created by traditional spark-ignition will lead to less NOx emission at very lean burning. Thus, we here show four new evidences based on experimental data and computational and theoretical considerations. (1) Quantitative clarification of compression level at condition without combustion (2) Atomization effect due to high-speed jets reducing fuel tank pressure (3) Combustion experiments in piston-less engine having pulsed 14-focusing jets colliding (1st prototype engine for checking this compressive combustion principle), which show noise-less high thrust data at lean fuel conditions and low wall temperature, reliably during these three years, which implies high potential of performance comparable to or more than traditional engines. (4) Experiments in strongly-asymmetric double piston engine having relatively high temperature domain around chamber center due to weak focusing compression by pulsed 8-focusing jets colliding, including piston compression and pressure gain due to pressure reflection at chamber wall (2nd prototype engine for automobiles), from which we get a possibility of nearly complete air-insulation effect. It is also stressed that this engine includes a new type of variable motions of intake-exhaust valve systems. These data also lead to a possibility of air-insulation in traditional engines having poppet-valves.