1) Explain how different engine operating conditions affect combustion ( ignition delay, temperatures, air fuel ratio,...

1) Explain how different engine operating conditions affect combustion ( ignition delay, temperatures, air fuel ratio, speed, heat transfer)?

2) What are the 3 sources of NOX formation, which is the least relevant, which is the most relevant, explain why?

Expert Solution

samet mamat answered 2 years ago

During the power stroke of an internal combustion engine, the air-fuel mixture is ignited and the...

During the power stroke of an internal combustion engine, the air-fuel mixture is ignited and the expanding hot gases push on the piston. Fuel efficiency is maximized in this process when the ignited gas is as hot as possible, the gas expands allowing a maximum amount of work to be done, and cooled exhaust gas is released at the end of the cycle. Assuming the engine exhibits the highest efficiency possible, which of the following statements concerning the exhaust gas...

Calculate the heat of combustion and the stoichiometric fuel to air ratio (mass and molar) for...

Calculate the heat of combustion and the stoichiometric fuel to air ratio (mass and molar) for 1) Methane and 2) Octane. Comment on whether the assumption of f<<1 is valid for these conditions.

(a) What is the best air/fuel ratio for an automobile engine? (b) If the mixture is...

(a) What is the best air/fuel ratio for an automobile engine? (b) If the mixture is made leaner, what happens to the hydrocarbon emissions? (c) If the fuel mixture is richer, how does this affect NOx emissions

1- You need to analyze the operation and performance of a four-stroke, spark-ignition internal combustion engine...

1- You need to analyze the operation and performance of a four-stroke, spark-ignition internal combustion engine (automobile engine). a- Would you analyze the engine as an Open System or a Closed System? b- How many properties of the engine exhaust would you need to measure in order to determine the Thermodynamic State of the exhaust gas? c- Identify a set of properties of the exhaust gas that you might measure to establish its state. d- Are these properties Intensive or...

The intial conditions for an air-standard Otto cycle operating with a compresssion ratio of 8:1 are...

The intial conditions for an air-standard Otto cycle operating with a compresssion ratio of 8:1 are 14.7 psia and 60degF. At the beginning of the compression stroke, the cylinder volume of 270 in^3 and 9 Btu of heat are added to the gas during the constant-volume heating process. Calculate the thermal efficiency and the mean effective pressure of the cycle.

Calculate air to fuel ratio by mass, for a four-cylinder SI engine running on i) gasoline...

Calculate air to fuel ratio by mass, for a four-cylinder SI engine running on i) gasoline and ii) a mixture of 20% methanol and 80% gasoline both at stoichiometric conditions. Assume gasoline is represented with C8H18 . Calculate any loss of power when gasoline-methanol mixture is used and discuss your results.

how do you relate the air fuel ratio to the equivalence ratio, and the ‘lambda’ ratio

1. How do different long term climatic conditions (including air temperature, humidity, solar radiation, precipitation) affect...

1. How do different long term climatic conditions (including air temperature, humidity, solar radiation, precipitation) affect the performance of concrete, steel and timber? 2. Discuss the formation of different types of cracking in concrete. What will be the potential problems if these cracks are not repaired? Discuss the methods to prevent and fix the cracks. 3. There are two parts below: a. What is difference between Minor Destructive Test (MDT) and Non Destructive Test (NDT) of concrete? In which situation,...

1. Explain how different experimental errors can affect the reported value of Keq.

1. Explain how different experimental errors can affect the reported value of Keq. Clearly state why the reported value of Keq would be bigger or smaller than the actual value. Examples may include: a) You thought the spectrometer was set to read trasmittance/absorbance at a wavelength of 447 nm, but it was actually set at 520 nm. b) You thought you measured the transmittance/absorbance in a cuvetter with a 1-cm pathlength, but it was actually 1.5 cm. 2. Would...

How Does the Ratio of Sand to Cement Affect the Strength of Concrete? Explain in details

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