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A Numerical Investigation of Gas Exchange Modeling and Performance Prediction of a Camless Two-Stroke Hydrogen Engine Chalmers University of Technology
- Format:
- Book
- Conference/Event
- Author/Creator:
- Tripathy, Srinibas, author.
- Conference Name:
- WCX SAE World Congress Experience (2023-04-18 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2023
- Summary:
- Heavy-duty vehicles are primarily powered by diesel fuel, emitting CO2 emissions regardless of the exhaust after-treatment system. Contrastingly, a hydrogen engine has the potential to decarbonize the transportation sector as hydrogen is a carbon free, renewable fuel. In this study, a multi-physics 1D simulation tool (GT-Power) is used to model the gas exchange process and performance prediction of a two-stroke hydrogen engine. The aim is to establish a maximum torque-level for a four-stroke hydrogen engine and then utilize different methods for two-stroke modeling to achieve similar torque by optimizing the gas exchange process. A camless engine is used as base, enabling the flexibility to utilize approximately square valve lift profiles. The preliminary step is the GT-Power model validation, which has been done using diesel and hydrogen engines (single-cylinder heavy-duty) experiments at different operating points (871 rpm, 1200 rpm, 1259 rpm, and 1508 rpm). Thereafter, the validated model is used to simulate four-stroke hydrogen engine performance at different intake and exhaust pressures. The last step was to modify the model to operate in two-stroke mode. The intake and exhaust valve closing timings, pressure differential, and air-fuel equivalence ratio were varied to investigate the delivery ratio, charging efficiency, trapping efficiency, and scavenging efficiency for perfect displacement and perfect mixing modes. The variable valve-actuated camless two-stroke hydrogen engine achieved similar torque to that of a conventional cam-operated four-stroke hydrogen engine by optimizing valve timings, pressure differential, and in-cylinder air-fuel mixture proportions
- Notes:
- Vendor supplied data
- Publisher Number:
- 2023-01-0232
- Access Restriction:
- Restricted for use by site license
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