Category Title
A proven in-cylinder, heat-retention technology is being adapted for natural-gas-fueled legacy-integral engines. This passive, retrofittable technology improves engine stability, reduces emissions and fuel consumption and enables stable engine operation on gas of variable chemical composition. The technology consists of a Regenerative Heat-Retaining Element (RHRE) engineered to be inserted into the engine cylinder heads. In-depth testing has been conducted on an 8.5-in bore AJAX test engine configured with direct injection (DI) and additional air flow so as to enable the lean-limit to be reached. Testing was also conducted with a 90% methane/10% ethane gas composition. Performance of the RHRE-equipped engine compared with the baseline engine is covered in this paper. These extensive test results demonstrate that RHRE enables a fundamentally new combustion process. Computer simulations and modeling of numerous design factors under varying engine conditions support the RHRE test results and demonstrate that the RHRE is designable for the many configurations of two-stroke Legacy engines. The computer simulations include chemical-kinetics and thermodynamic first-principle analyses. Legacy engines face ever-tightening emissions limits. The in-cylinder RHRE retrofit kit represents a layered, complementary, passive solution to this vexing problem. This paper will show how RHRE improves stability while improving engine performance.
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