The potentials of direct injection (DI) and jet ignition (JI), assisted turbocharging, and rotary valves to deliver high efficiency, high power density positive ignition (PI) internal combustion engines (ICEs) is here investigated. DI JI and assisted turbocharging has demonstrated to permit ICEs able to deliver peak efficiency above 50% and power density of 340 kW/liter at the 15,000 rpm revolution limiter working overall λ = 1.45 with gasoline. The further improvement in power density that may be obtained by replacing poppet valves with rotary valves, while also using mechanical, rather than electric, assisted turbocharging, are here numerically investigated A numerical rotary valve ICE, that is adopting super-turbocharging is developed. Results of simulations show the opportunity, working overall λ = 1.45 with methanol, power densities of 480 kW/liter, while also delivering an about constant torque, and a consequently nearly linear power curve, over an extremely wide range of speeds, up to 24,000 rpm. With gasoline, the power density is 450 kW/liter. The proposed engine design could be used to revive IndyCar racing, with methanol, for improved performance and technical appeal, or in military unmanned aerial vehicles (UAV) with gasoline, for enhanced range, altitude, payload, and maneuverability.

本文研究了直接喷射（DI）和喷射点火（JI），辅助涡轮增压以及旋转阀提供高效率，高功率密度正点火（PI）内燃机（ICE）的潜力。事实证明，DI JI和辅助涡轮增压技术可以使ICE在15,000 rpm的转速限制器上以汽油运行时总峰值λ= 1.45，能够提供超过50％的峰值效率和340 kW / L的功率密度。在此数值研究了通过用旋转阀代替提升阀，同时还使用机械而不是电动辅助涡轮增压的功率密度的进一步提高。开发了一种采用超级涡轮增压的数字旋转阀ICE。模拟结果表明，使用甲醇处理整个λ= 1.45的机会，功率密度为480千瓦/升，同时还可以在高达24,000 rpm的极宽速度范围内提供大约恒定的扭矩，以及因此接近线性的功率曲线。对于汽油，功率密度为450 kW /升。拟议中的发动机设计可用于复兴使用甲醇的IndyCar赛车，以提高性能和技术吸引力，或用于汽油的军用无人机（UAV），以提高射程，高度，有效载荷和机动性。