Engineering, 24.04.2020 16:44, kaleabussell9
There has been considerable research on low-heat-rejection (LHR) diesel engines (sometimes called adiabatic diesels). These engines insulate the combustion chamber with high temperature ceramic materials to reduce the amount of heat normally lost to the coolant. Also, the increased energy available in the engine exhaust is used to turbocharge the intake air. You are asked to compare a turbocharged LHR diesel engine against a baseline, naturally aspirated (no inlet boost) diesel engine with cooled metal combustion chamber walls. Assuming that both engines have the same compression ratio, engine speed, combustion chamber geometry, injection timing, type and amount of fuel injected per cycle: a) Which engine is likely to induct more mass of fresh air to the cylinder per engine cycle and why? b) Which engine is likely to experience higher peak pressure and temperatures, why? c) Which engine is likely to have a decreased tendency to knock, why? d) Which factors are likely to favor the LHR engine's production of gross indicated work and why? e) Explain why long ignition delays affect engine startup
Answers: 3
Engineering, 04.07.2019 18:10, selenamr
Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed. gi) ifn 1, what will happen to the material when transformed material when
Answers: 1
Engineering, 04.07.2019 18:20, moneywaydaedae
Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis
Answers: 1
Engineering, 04.07.2019 19:10, gabrielaperezcz
Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?
Answers: 3
Engineering, 04.07.2019 19:10, LadyHolmes67
Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false
Answers: 3
There has been considerable research on low-heat-rejection (LHR) diesel engines (sometimes called ad...
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