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UAS Propulsion System Design
Published in R. Kurt Barnhart, Douglas M. Marshall, Eric J. Shappee, Introduction to Unmanned Aircraft Systems, 2021
Michael T. Most, Graham Feasey
In diesel cycle engines, the fuel is ignited by the heat generated by the compression stroke. To produce enough heat and achieve the autoignition temperature of the fuel, diesel cycle engines have higher compression ratios than four-cycle engines. This, in turn, generates much greater power stroke pressures. To contain these higher pressures, diesel engines are more substantially built and therefore heavier. Diesel cycle engines may be four-cycle, two-cycle, or Wankel designs. Modern diesel cycle engines are turbocharged with direct fuel injection. Turbocharging increases the air charge on the intake stroke, which increases engine power. Fuel is directly injected into the combustion chamber when the piston is near top-dead-center. The air pressure in the cylinder is very high at this point requiring a very high fuel supply pressure. Engine power is controlled by the quantity of fuel injected.
Gas Power Cycles
Published in Kavati Venkateswarlu, Engineering Thermodynamics, 2020
The Diesel cycle, named after Rudolf Christian Karl Diesel (1858–1913), is an ideal air-standard cycle that describes the functioning of a compression ignition piston (CI) engine. The air-standard Diesel cycle consists of four processes, two reversible adiabatic processes (compression and expansion) and one reversible constant pressure heat addition and constant volume heat rejection process. Just like in a four-stroke SI engine, the piston executes four complete strokes within the cylinder, and the crankshaft completes two revolutions for each thermodynamic cycle. Figure 11.6 shows the indicator diagram of the Diesel cycle.
Reciprocating Engines
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
Combustion occurs in a compression-ignition Diesel-cycle engine when fuel is injected into the hot compressed air charge in the cylinder. Diesel engine fuel injection systems are required to atomize and distribute fuel in the combustion chamber, as well as precisely control the rate of injection based on operating parameters.
Implications of Arctic shipping emissions for marine environment
Published in Maritime Policy & Management, 2022
Qiong Chen, Ying-En Ge, Adolf K.Y. Ng, Yui-yip Lau, Xuezong Tao
Emissions data for vessels remain relatively scarce due to the complexity of emissions test procedures and the related costs to produce them. The baseline emission factors of the main engines (MEs) used in this study (see Appendix C, Table C.6) are obtained from (Environmental Protection Agency (EPA) 2009). When the diesel-cycle engines operated at 20% or less of the power requirements, their emissions factors tended to increase, as these engines are less efficient at a low load level. Table C.7 in Appendix C provides the low-load adjustment multipliers for the emission factors, based on the data provided by the port of Los Angeles (Port of Los Angeles 2014). The emission factors of the AEs and the boilers are accordingly provided in Tables C.8 and C.9 in Appendix C, respectively (Environmental Protection Agency (EPA) 2009; Port of Los Angeles 2014).