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A path towards high efficiency SI combustion in a CFR engine: Cooling the intake to sub-zero temperatures King Abdullah Univ. of Science and Tech
- Format:
- Book
- Conference/Event
- Author/Creator:
- Jan, Sufyan Mohammad, author.
- Conference Name:
- WCX SAE World Congress Experience (2020-04-21 : Detroit, Michigan, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2020
- Summary:
- Textbook engine thermodynamics predicts that SI (Spark Ignition) engine efficiency η is a function of both the compression ratio CR of the engine and the specific heat ratio γ of the working fluid. In practice the compression ratio of the SI engine is often limited due to "knock". When this knock limit is reached, increase in heat transfer losses result in reduction in efficiency. One way to lower the end-gas temperature is to cool the intake gas before inducting it into the combustion chamber. With colder intake gases, higher CR can be deployed, resulting in higher efficiencies. In this regard, we investigated the indicated efficiency of the standard Waukesha CFR engine. The engine is operated in the SI engine mode. The engine was operated with three different mediums using the same fuel Methane (Gas). First is Air + Methane at room temperature, second was O2 + Argon + Methane gas mixture at room temperature, and lastly O2 + Argon +Methane at sub-zero conditions. We replace the Air by an Oxygen-Argon mixture to increase the specific heat ratio since Argon has a relatively high specific heat ratio. It is also an inert gas with a very low chemical reactivity which makes it a good candidate in terms of emissions control. Given that Argon has a relatively low heat capacity, this results in very high in-cylinder temperatures which, in turn, leads to severe knock, hence why we cool the intake to extract the most out of the engine. This study aims to provide a complete analysis of the effects of cooling the intake and increasing the compression ratio in a CFR engine operating an Argon cycle, while at the same time sweeping the spark timing to locate the MBT. Diagrams show casing the combustion process, pressure, temperature and heat release traces are presented. The main parameters that are analyzed are the energy distribution, energy losses and their respective effects on the combustion, gas exchange, and thermodynamic efficiencies
- Notes:
- Vendor supplied data
- Publisher Number:
- 2020-01-0550
- Access Restriction:
- Restricted for use by site license
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