Power Improvement of Turbocharged Hydrogen Direct Injection Engine with Lean Boosting Strategy in Nox-Free Operation
26 Pages Posted: 20 Aug 2022
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Power Improvement of Turbocharged Hydrogen Direct Injection Engine with Lean Boosting Strategy in Nox-Free Operation
Power Improvement of Turbocharged Hydrogen Direct Injection Engine with Lean Boosting Strategy in Nox-Free Operation
Abstract
Lean boosting is one of the low-temperature combustion technologies that can contribute to the expansion of the operation range by reducing the pressure increase rate and the combustion temperature due to the increase in the intake air amount even though the amount of heat supplied is the same. By optimizing the boosting device of the direct injection type hydrogen engine, it was expected that the operating range could be expanded through torque increase due to the increase in the amount of heat supplied according to the increase in intake air mass, and the emission of nitrogen oxides was expected to be suppressed due to lean low-temperature combustion. In the present study, in order to examine the possible output limit under high-lean boosting conditions of a hydrogen engine by applying a boosting device with a different control method, the performance according to the engine speed was observed under the condition of minimizing nitrogen oxide emission. With the improvement of the boosting performance by the variable turbocharging device, the output was improved by 165% compared to the naturally aspirated type combustion at the rotation speed of 5,000 rpm.
Keywords: hydrogen, In-cylinder direct injection, Lean boositng, Turbocharger, Torque, NOx free
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