In a diesel engine, what is the advantage of precombustion chambers over the open type of combustion chamber? Precombustion chambers permit coarser fuel atomization. Precombustion chambers allow lower fuel injection pressure.
• Diesel combustion chamber types: open vs precombustion chamber designs • Fuel atomization and mixing: how droplet size and mixing with air affect combustion • Injection pressure: why higher or lower pressure might be needed in different chamber designs
• For a precombustion chamber, think about where and how the fuel first burns and how that helps mix air and fuel in the main cylinder. • Ask yourself: does better mixing usually require finer or coarser atomization of fuel droplets? • Consider whether a more complex combustion chamber shape tends to demand higher or lower fuel injection pressure for proper spray penetration and distribution.
• Be clear on how precombustion chambers change the flow and turbulence of air-fuel mixture compared to open chambers. • Decide whether coarser fuel atomization would help or hurt efficient mixing and complete combustion in a diesel engine. • Check whether lower injection pressure would normally improve or reduce a diesel engine’s ability to atomize fuel effectively.
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